nyala api dari Magnesium (Mg)

How to Make Slime

Konfigurasi Elektron

Lesson Plan Buffer Solution

LESSON PLAN BUFFER SOLUTION

Unit Education  : Senior High School
Subjects              : Chemistry
Class / Semester : XI IPA / 2
Material              : Buffer Solution
Time                   : 4 meetings (4 x 3hours)

I.              Core Competencies :

Cc 1     : Internalize and apply the relligious tennates attended

Cc2      : Internalize and apply honest behaviour, discipline, responsible, caring (mutual assistance, collaborative, tolerant, peacefull) good manners, responsive and proactive and show an attitude as part of solution of problems in effective interaction by social and natural environment and place him/her self as such to reflect the nationality among other nations acrros the world

Cc 3     : Understand apply and analyze factual, conceptual, procedural and metacognitive knowledge grounded on curiousity feeling about knowledge, technology, art, culture, and humaniora by humanity, nationality, citizenship, and civilizatiton related to phenomena  and events and apply procedural knowledge on specific are of study appropiate with talent and his/her interset for problem solving.

Cc 4     : Manage, reason and present in concreate and abstract domain related with what to develop in his/her study in the school by self and capable of using the scientific method.

II.   Achievement Indicators Basic Competence and Core Competence

KD of KI 1:

1.1 Recognizing the regularity of the structure of matter as the particle greatness of Almighty God and the knowledge of the structure of matter particles as a result of human creative thinking that truth is tentative.

Indicators :

·           Exalts the greatness of God Almighty

·           Recognizing that the conditions set by the Almighty God is the best for us.

KD of KI 2:

2.1 Demonstrate scientific behavior (curious, disciplined, honest, objective, open, able to distinguish fact and opinion, tenacious, thorough, responsible, critical, creative, innovative, democratic, communicative) in design and conduct experiments and discuss the embodied in everyday behaviors.

Indicators:

·           Curiosity

·           Honestly in using experimental data to prove a legal chemical basis (using the data for what it is and the results are in accordance with the data experiments)

·           Thorough in processing and analyzing the data (perform legal proof basic chemical and consistent trace the steps and truth results)

·           Tenacious in finding the source of knowledge that supports the completion of problem (can resolve the problem at the beginning to the end of the trace the correct steps).

KD of KI 3:

3.13 Analyzing the nature of the role of the buffer solution in the living body

Indicators:

·           Mention sense buffer solution

·           Identifying the properties of buffer solution through trial

·           Explain formation solution buffer

·           Explain relationship nature of the buffer on blood

KD of KI 4:

4.8  Design, conduct, and conclude and present the results of experiments to determine the nature of the buffer solution

Indicators:

·           Designing experiments to investigate the nature of the buffer solution

·           Experimenting nature solution buffer on some solution

·           Observe and record the experimental data solution buffer

·           Process and m enganalisis experimental data solution buffer

·           Summing properties by the addition of buffer solution slightly acids, bases or dilution

·           Communicate the nature of the experimental results buffer solution

III.        Learning Objectives

1.      Students may be aware of the regularity of the solution as a manifestation of the greatness of God Almighty.

2.      Students can demonstrate positive attitudes (individual and social) in group discussions

3.      Students can demonstrate the behavior and attitude of accepting, appreciating, and executing honesty, rigor, discipline and responsibility

4.      Students may mention the sense of a buffer solution

5.      Students can identify the properties of buffer solution through trial

6.      Students can explain the formation of solution buffer

7.      Students are able to explain relationship nature of the buffer on blood

8.      Students can design an experiment to investigate the nature of the buffer solution

9.      Students can discriminate n trials of an nature solution on some solution.

10.  Students can observe and record the experimental data solution buffer on some solution.

11.  Students can either though and analyzing experimental data buffer solution.

12.  Students can infer properties of the solution by the addition of slightly acids, bases or dilution.

13.  Student can determine the pH of the solution buffer.

14.  Student can determine graph relationship change pH on titration acid alkali for explain nature solution buffer.

15.  Student can presented result trial use system correct language.

IV.     Learning Materials

Ø  Components of a buffer solution
Buffer solution can be prepared by mixing a weak acid with its conjugate base or a weak base with its conjugate acid. Example:
a. acid buffer solution, CH3COOH (aq) + CH3COONa (aq)
Data acidic pH buffer solution is determined by calculation based on the equilibrium reaction:
HA H + + A-
Ka = [H +] [A-]
            [HA]
[H +] = Ka. [HA]
                     [A-]
Note: [HA] = concentration of acid
        [A-] = concentration of salt
b. alkaline buffer solution, NH3 (aq) + NH4Cl (aq)
Data alkaline pH buffer solution were determined by calculation based on the equilibrium reaction:
MOH M + + OH-
Ka = [M +] [OH-]
            [MOH]
[OH-] = Ka. [MOH]
                       [M +]
Note: [MOH = concentration of base
        [M +] = concentration of salt

Ø  How a buffer solution
 If the acid is added, the H + ions and the acid will react with ions to form CH3COOH CH3COO-pH so prices are likely to remain.
 If a base is added, the OH-ions will be neutralized by CH3COOH, pH so prices are likely to remain

Ø  The nature of the buffer solution
The nature of the buffer solution is to maintain the pH value if :
 To a solution buffer was added a bit of acid or base.
 The solution was diluted

V.      Learning Method

The method used is scientific approach SETS

Guided Inquiry Learning Model

VI.    Learning Resources

·         Michael Proto, Chemistry Class X SMA / MA, grants, Jakarta

·         Handbook of Chemistry vol 1, Allied Chemical Activity Book Student, and hands out

·         Worksheets

·         Newspaper

·         Video

·         Module

VII. Learning Media (Media, Equipment, Materials)

·         Newspaper

·         Chemistry Books

·         Module

·         Video

VIII. Learning Steps Activity

v  Meeting 1

Time	Activity
Introduction 15 minutes	Students respond regards and questions relating to the conditions of teachers and attendance As apersepsi to encourage curiosity and critical thinking, the teacher asked a question about blood and its properties. Teachers motivate students to show the video "Blood role in maintain blood " Students receive information competence, material, purpose, benefits, and lessons that will be implemented Teachers collect oral reading tasks and search for articles about a buffer solution
Core activities 90  minutes	1.        Student asked m engkaji literature on buffer solution. 2.        Teachers m engajukan question whether all solutions can maintain its pH? Why a solution can maintain its pH? What are the benefits of a buffer solution in body creature life? 3.        The teacher gives material early about understanding solution buffer and its properties 4.        Teachers provide data results experiment about solution buffer and memberika n example way determine the pH of the solution buffer. 5.        Student requested for determine the pH of the data results experiments.
Closing 30minutes	·      Teachers with students to make inferences about solution nature solution buffer and way determination pH. ·      The teacher asks student search literature about role buffer in life day-to-day

v  Meeting 2

Time	Activity
Introduction 15 minutes	·       Students respond regards and questions relating to the conditions of teachers and attendance ·      The teacher asks task read literature about application nature solution blood in life daily ·      The teacher divides teachers into group large
Core activities 90 minutes	·      Students discuss result task read ·      The teacher asks student present result discussion
Closing 30 minutes	·        Teachers with students to make inferences about the discussion. ·        The teacher asks student learn experiment solution buffer for activity laboratory

v  Meeting 3

Time	Activity
Introduction 15 minutes	( Phase I : Orientation of students to the problem ) a. Teachers deliver the learning objectives ( KD and indicators ) b . Teachers give a pretest to determine students' prior knowledge of the material to be covered c . Teachers motivate students by way of delivering usability buffer material in everyday life and do apperception . d . Teachers pose problems in daily life related to the buffer material.
Core activities 90 minutes	( Phase II : Organizing students to learn ) a. The teacher organizes students into each group . b . The teacher instructed the students to open a worksheet that has distributed 01 . c . The teacher gives instructions to students on how to work on the problems posed in the LKS 01 .  ( Phase III : Guiding investigation of individual and group ) a. Teachers help students define and organize tasks to be performed as set out in its LKS respectively ( LKS/XI-2/LP/01 ) in groups b . The teacher directs students to conduct research in the theory of the issues expressed in the article O - FISH in LKS 01 by utilizing the students as well as other reference books that are relevant to the task at hand c . Teachers guide students to create a temporary answer ( hypothesis ) of the issues expressed in the article O - FISH in LKS 01 . ( Phase IV : Developing and presenting the works ) a. Teachers provide guidance in order to do brainstorming in groups to answer all pertanyanyaan in LKS 01 . b . Teachers check the work of each group before it was read in class . ( Phase V : Analyze and evaluate the problem-solving process ) a . Directing each group to check back LKS group's work b . One group was appointed to read the group's work in LKS and other groups provide questions / comments / input . c . The teacher gives the answer reinforcement developed in the discussion .
Closing 15 minutes	The final activity ( + 5 min ) a. Teachers provide an appreciation of the report of the discussion that has been collected by each group b . Teachers submit action plan at the next meeting .

v  Meeting 4

Time	Activity
Introduction 15      minutes	·      Students respond regards and questions relating to the conditions of teachers and attendance. ·      Teachers charge task report as result psychomotor and cognitive.
Core activities 90 minutes	·      The teacher told student for presented result report according to dated. ·      Other students scrutinize and prepare question for student presentations. ·      Teachers see course process presentation and answer question
Closing 30 minutes	·      Teachers with students to make inferences about activity presentation. ·      The teacher asks student work questions exercise in LKS.

IX.    Assessment

Attitudes and Skills Assessment process experimental data include:

1.      Spiritual Attitude

a.      Technique                  : Observations

b.      Help Instruments      : Observation Sheet

c.       Grating                      :

No.	Attitude / Value	Item Instrument
1	Realizing that all the gifts of God Almighty	Be grateful
2	Realizing that God Almighty will provide convenience	Pray prev and after doing something

2.         Social Attitudes

a.      Technique                  : Observations

b.      Help Instruments      : Observation Sheet

c.       Grating                      :

No.	Attitude / Value	Item Instrument
1	Honesty	·         Not cheating during a test. ·         Not plagiarism. ·         Do not steal from friends.
2	Discipline	·         Arrive on time ·         Tasks on time ·         Orderly, obedient ·         Dressed and well groomed
3	Responsibility	·         Return the borrowed items ·         Doing a good job ·         Accept the risk of acts committed

3.      Knowledge

a.      Technique                    : Observations

b.      Help Instruments        : Observation Sheet

c.       Grating                        :

No.	Attitude / Value	Item Instrument
1	Curiosity	·         Able to answer questions ·         Being able to predict the solubility of the precipitate in ·         Being able to calculate the solubility and solubility results ·         Able to understand the concepts of solubility and solubility product

4.      Skill

a.       Technique             : Observation

b.      Help Instruments : Observation Sheet

c.       Grating                 :

No.	Attitude / Value	Item Instrument
	Patient	Preparing den tool materials with good Not in a hurry at the time of trial
	Not interfere friend	Willingness perform duties in conformity deal
	Discipline	Orderly in conducting experiments in laboratory
	Responsibility	Replace if damaged the appliance
	Thorough	Be careful when experimenting
	Net	Always clean the instrument after use
	Neat	Using a lab coat properly
	Honest	Reported experimental data it is

X.      Valuation

Worksheet 01: BUFFER SOLUTION

LKS buffer (BUFFER)

Ø  Objectives:

Studying the nature of the buffer solution and not the addition of a little acid buffer, bases, or dilution.

Ø  Theory:

Most of the metabolic processes in living organisms takes place at pH constant. Enzymes work well in certain pH. Bacteria multiply at pH particular. Blood pH is relatively constant at 7.4. To maintain the pH of the solution to prevent changes are striking, use substances that are buffers. Buffer solution is a solution that containing a weak acid with its salt, or a weak base with its salt.

Ø  Tools and Materials:

o   Test tubes (4) and the rack

o   M NaCl solution

o   CH3 solution

o   COONa 0.1 M

o   Pipette 4

o   HCl solution

o   solution of NH3 0.1 M

o   10 ml measuring cup (1)

o   M NaOH solution

o   solution of NH4

o   Cl 0.1 M

o   Universal indicator

o   solution of CH3

o   COOH 0.1 M

o   distilled water

o   100 ml beaker (1)

Ø  Procedure.

1.      Insert the 5 ml of H2O into the reaction tube. Give 1 sheet indicators universal. Record the pH prices. Divide the solution into 2 and enter into test tube.

2.      Into the first test tube, Adding 2 drops of 0.1 M NaOH Record the pH prices.

3.      Into the second test tube, add 2 drops of HCl 0.1 M. Record the pH prices.

4.      Put to the test tube 2 ml CH3 COOH + 2 ml of 0.1 M CH3 COONa 0.1 M

5.      Calculate the pH, then the solution is divided into 2 pieces of test tubes

6.      Into the first test tube, add 2 drops of 0.1 M NaOH, calculate the pH of its

7.      Into the second test tube, add 2 drops of 0.1 M HCl, calculate the pH of its

8.      Put to the test tube 2 ml of NH4 OH + 2 ml of 0.1 M NH4 Cl 0.1 M

9.      Calculate the pH, then the solution is divided into 2 pieces of test tubes

10.  Into the first test tube, add 2 drops of 0.1 M NaOH, calculate the pH of its

11.  Into the second test tube, add 2 drops of 0.1 M HCl, calculate the pH of its

Observation

pH	H2O	+ NaOH	+ HCl
First	.....	____	____
mix	___	.....	.....

a.

b.

pH	CH3COOH + CH3COONa	+ NaOH	+ HCl
First	.....	____	____
mix	___	.....	.....

c.

pH	NH4OH + NH4Cl	+ NaOH	+ HCl
First	.....	____	____
mix	___	.....	.....

Question.

1. Solution of NH₄OH + NH₄Cl called buffer solution .......

2. Solution of CH₃COOH + CH₃COONa buffer solution called .......

3. Give the conclusion of the experiment above.

A. Answer the question below correctly!

1. What is a buffer solution?

2. Provide an example of a buffer solution in everyday life!

3. Stand is divided into 2. Explain!

4. Describe the properties of a buffer solution?

B. Choose one best answer!

5. Among the mix below includes buffer solution, except ....

a. NH4OH and NH4Cl

b. HCN and KCN

c. CH3COOH and CH3COONa

d. H2CO3 and KHCO3

e. Ca(OH)2 and CaCl2

6. The function of the buffer solution in the blood system is to maintain .....

a. Blood acidity

b. fibrionogen blood ..

c. Blood Hb

d. White blood cells from blood

e. Red blood cells from blood

7. Some solution reacted as follows.

(1) 100 ml of 0.1 M acetic acid and 100 ml of 0.1 M NaOH

(2) 100 ml of 0.2 M acetic acid and 100 ml of 0.1 M NaOH

(3) 100 ml of 0.1 M hydrochloric acid and 100 ml of NH 4 OH 0.1 M

(4) 100 ml of 0.05 M hydrochloric acid and 100 ml of NH 4 OH 0.1 M

Mixture on top of which forms a buffer solution is

a. (1), (2), and (3)

d. (4)

b. (1) and (3)

e. all solution

c. (2) and (4)

scores obtained Value = --------------------------- x 100                   maximum score