How many grams of sodium benzoate should be added to prepare the buffer? Neglect the small volume change that occurs when the sodium benzoate is added.

grams

Explanation:

Complete question is

You are asked to pre pare a pH = 4.00 buffer starting from 1.50 L of 0.0200 M solution of benzoic acid

(C6H5COOH)

and any amount you need of sodium benzoate

(C6H5COONa)

How many grams of sodium benzoate should be added to prepare the buffer? Neglect the small volume change that occurs when the sodium benzoate is added.

Solution

Given

pH of the buffer solution

Concentration of C6H5COOH M

Volume of the buffer solution L

value for benzoic acid is

Concentration of sodium benzoate

Substituting the given values we get

Number of moles in sodium benzoate

Mass of sodium benzoate

it have destructive character