Find the pH of a 0.100 M solution of a weak monoprotic acid having Ka= 1.2×10−3....

Question

Question

Find the pH of a 0.100 M solution of a weak monoprotic acid having Ka= 1.2×10⁻³.

Express your answer to two decimal places.

Answer 1

Answer #1

Let the acid be HA

HA----> H+ +A-

Initial HA = 0.1 H+ = [A-]= 0

change [HA] =-x [H+] =[A-] =x

At Equilibrium HA= 1-x [H+] =[A-] =x

Ka= x²/(1-x)= 1.2*10^-3

this equation gives when solved usong solved gives x =0.0341

[H+] =0.0341

pH= -log(0.0341)=1.467

Answer 2

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