Chapter 7 2025/2026

a) Propanoic acid, C2H5COOH, is used in the manufacture of calcium propanoate, a food preservative. Calculate the pH of the solution and the degree of dissociation if the initial concentration of C2H5COOH is 0.658 M. [Acid dissociation constant, Ka for C2H5COOH is 1.34 x 10-5] 

[6 Marks]

a) Determine whether a precipitate will form if 0.5 L solution of 0.012 M Fe(NO3)2 is mixed with 0.8 L solution of 0.002 M Na2S. [Solubility constant, Ksp for FeS is 4.9 x 10-18]  

[8 Marks]