How to prepare ACETIC ACID- SODIUM ACETATE BUFFER?

(This is practical experiment)

How to prepare ACETIC ACID- SODIUM ACETATE BUFFER?

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 REAGENTS REQUIRED:  

Acetic Acid 0.2M: 1.5 ml of glacial acetic acid is made upto 100ml with     distilled water. 

Sodium Acetate Solution: 0.64 gm of sodium acetate or 2.72gm of sodium acetate trihydrate is dissolved in 100ml Distilled water. 

PROCEDURE: 

Pipette out exactly 36.2ml of sodium acetate solution into 100ml of standard flask and add 14.8ml of glacial acetic acid, make the volume 100ml using distilled water using distilled water. This gives 0.2 M of acetic acid and sodium acetate buffer. The pH is measured with pH meter.  

 pH meter is first standararised with pH buffer. Wash electrode with distilled water and introduced into 0.2M acetic acid-sodium acetate buffer prepared, the pH of solution is 4.6. 

 RESULT:  

36.2ml Sodium acetate and 14.8 ml glacial acetic acid were mixed and buffer was prepared. pH was measured initial reading observed was 4 which made upto 4.6 with 5N NaOH.