Question

Calculate the pH of each of the following mixtures.

a) 25.00 ml 0.2875 M HCl mixed with 12.25 ml 0.3548 M KOH

b) 25.00 ml 0.2875 M HCl mixed with 35.25 ml 0.3548 M KOH

c) What is the pH of a solution containing 0.52 M HBr and 1.25 M CH3CO2H.

d) 25.00 ml 0.2875 M HOCl (ka = 3.5 x 10-8) mixed with 12.25 ml 0.3548 M KOH

e) 25.00 ml 0.2875 M HOCl (ka = 3.5 x 10-8) mixed with 35.25 ml 0.3548 M KOH

f) 25.00 ml 0.2875 M HCl mixed with 20.26 ml 0.3548 M KOH

g) 25.00 ml 0.2875 M HOCl (ka = 3.5 x 10-8) mixed with 20.26 ml 0.3548 M KOH

Answer 1

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In part C

Dissociation of CH3COOH is highly suppressed due to common ion effect.

So it's contribution towards H+ is neglected.