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An acid is a compound that produces hydrogen ions when dissolved in water. The pH of acid is less than 7 because it is rich in H+ concentration. Basic solutions have pH greater than 7 because it is rich in OH-. Neutral solutions meanwhile have pH equal to 7.

Answer: a. acid

Explanation:

a. Acids are those substances which either donates hydrogen ions \((H^+)\) when dissolved in water or accepts a pair of electrons.

\(HCl\rightarrow H^++Cl^-\)

b. Buffer is a solution which resist changes in pH on addition of small amounts of acid or base into it.

c. Bases are those substances which either donates hydroxide ions \((OH^-)\) when dissolved in water or donates a pair of electrons.

\(NaOH\rightarrow Na^++OH^-\)

d. Indicators are chemical compounds which show a change or appearance in color at particular pH. Example: litmus

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