Which of the following is the equilibrium constant expression for the dissociation of the weak acid HOCl?

Consider a solution of 2.0 M HCN and 1.0 M NaCN (Ka for HCN = 6.2 × 10–10). Which of the following statements is true?

Which of the following aqueous solutions will have the highest pH? For NH3, Kb = 1.8 × 10–5; for C2H3O2–, Kb = 5.6 × 10–10.

The sodium salt, NaA, of a weak acid is dissolved in water; no other substance is added. Which of these statements (to a close approximation) is true?

For the stepwise dissociation of aqueous H3PO4, which of the following is not a conjugate acid–base pair?

Which of the following mixtures would be classified as a buffer solution?

Given the following Ksp values, which statement about solubility in mol/L in water is correct?   Ksp   Ksp PbCrO4 2.0 × 10–16 Pb(OH)2 1.2 × 10–15 Zn(OH)2 4.5 × 10–17 MnS 2.3 × 10–13

Consider the following indicators and their pH ranges: Methyl orange 3.2-4.4 Methyl red 4.8-6.0 Bromothymol blue 6.0-7.6 Phenolphthalein 8.2-10.0 Alizarin yellow 10.1-12.0 Assume an indicator works best when the equivalence point of a titration comes in the middle of the indicator range. For which of the following titrations would methyl red be the best indicator?

Consider the reaction HNO2(aq) + H2O(l)

Which of the following is not true for a solution at 25°C that has a hydroxide concentration of 2.5 × 10–6 M?