im having some trouble with the following questions. if anyone can help it will be much appreciated.
1. "what is the pH of a solution 0.16 M in acetic acid and 0.15 M in sodium acetate? Ka for acetic acid 1.75e-5"
this is what ive done: CH3COOH + H2O --> H30+ + CH3COO-
1.75e-5 = (0.15+x)(x)/(0.16-x) therefore x = 3.73e-5 (solve for x using quadratic formula)
so pH = -log(3.73e-5) = 4.43
im a bit confused though. im not sure if ive done everything correctly???
2. "1.90 g of potassium cyanide is dissolved in water and the solution made up to 250mL in a volumetric flask. what is the pH of the solution? Ka for HCN = 4.90e-10"
the mass is confussing me in this question. i dont know where to start.
please *delete me*