Question

A buffer solution is prepared by mixing 3 g of acetic acid and 1.30 g of sodium acetate (CH3COONa 3H2O) and making the total volume to one litre. Calculate the pH of the buffer (Ka = 1.8 × 10–5)​

Answer 1

Answer:

First, calculate the pKa value.

pKa=−logKa=−log1.8×10

−5

=4.75

Now calculate the pH of the solution:

pH=pKa+log

acetic acid

sodium acetate

=4.75+log(

0.13833

0.1951

)

=4.75+0.1440=4.8940≈5

Explanation:

I hope this helps you.