Which of the following aqueous solutions has a pH greater than 7? (A) Sodium citrate (B) Sodium chloride (C) Ammonium nitrate (D) Ammonium chloride - HSC - SSCE Chemistry - Question 13 - 2007 - Paper 1

1. Sodium citrate: This is the salt of a weak acid (citric acid) and a strong base (sodium hydroxide), thus it has a tendency to create a basic solution and will likely produce a pH greater than 7.

2. Sodium chloride: This is a neutral salt formed from a strong acid (hydrochloric acid) and a strong base (sodium hydroxide), typically resulting in a pH of 7.

3. Ammonium nitrate: As a salt of a weak base (ammonia) and a strong acid (nitric acid), this solution will typically exhibit a pH less than 7.

4. Ammonium chloride: Similar to ammonium nitrate, this salt is formed from a weak base (ammonia) and a strong acid (hydrochloric acid), resulting in a pH less than 7.

Based on the analysis, Sodium citrate is the only solution with a pH greater than 7.