Question

A student took a sodium salt and dissolved it in water. When this aqueous sodium salt solution was tested with universal indicator paper, its pH was found to be 9.
(a) What does pH 9 tell us about the sodium salt solution?
(b) Name one sodium salt which can produce such a solution.

Answer 1

Answer:

i) pH9 tells us that solution is basic in nature

ii) Na2Co3 sodium bicarbonate

Answer 2

Explanation:

(a) pH of sodium salt:

• The pH of the sodium salt solution tells us that the solution is a base. Any solution whose pH is lesser than 7 is acidic solution; solution with pH equal to 7 is neutral; and solution whose pH more than 7 is base.
• Base are chemical compounds which produce $OH^-$ ions in aqueous solution.

(b) Sodium salt solution:

• Sodium bicarbonate (a salt) produced sodium solution when reacting with compounds such as "hydrochloric acid".
• $\mathrm{NaHCO}_{3}+\mathrm{HCl} \rightarrow \mathrm{NaCl}+\mathrm{CO}_{2}+\mathrm{H}_{2} \mathrm{O}$