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Sudeep Ruj Grade: 11
        

What is the amount of potassium acetate to be added to 1 litre of N/10 acetic acid to make a buffer solution of pH=4 using acetic acid and potassium acetate? The dissociation constant of acetic acid =2*10^-5

6 years ago

Answers : (1)

vikas askiitian expert
510 Points
										

let the amount of potassium acetate  = m grams


M(CH3COOK) = m/92 .........1


normality of acetic acid = molarity*1


M( CH3COOH) = 0.1               


Ka = [salt][H+]/[acid]


  PH =4 means [H+] = 10-4


Ka = M(CH3COOK][H+]/[CH3COOH]


2*10-5 = [m/92][10-4]/[10-1]


 m= 1.84grams

6 years ago
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