Tartaric acid is a weak diprotic acid with `K_1 = 1 xx 10^(-3) ` and `K_2 = 4.6 xx 10^(-5)` .
(a) Letting the symbol `H_2A` represent tartaric acid, write the chemical equations that represent `K_1` and `K_2`. Write the chemical equation that represents `K_1 xx K_2`.
(b) Qualitatively describe the relative concentrations of `H_2A , HA^(-) , A^(2-) ` and `H_3O^+` in a solution that is about 0.5 M in tartaric acid.
(c) Calculate the pH of a 0.025 M tartaric acid solution and the equilibrium concentration of `H_2A`
(d) What is the `A^(2-)` concentration?