Question

Which statement best describes the pH of pure water?
It is neutral because the concentration of hydronium ions equals that of hydroxide ions.
It is neutral because the pure liquid contains neither hydronium ions nor hydroxide ions.
It is acidic because it has a hydronium ion concentration of 1.0 x 10-7 M-
It is basic because it has a hydroxide ion concentration of 1.0 x 10-7M.
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Answer 1

The pH of pure water is neutral because the concentration of hydronium ions equals that of hydroxide ions.

Answer: Option A

Explanation:

Water is one of the most important constituents of living being. It is said that there is no life without water. So that water need to neutral in nature to save life. Pure water is composed of hydronium $H^{+}$ and hydroxide $\left(O H^{-}\right)$ ions. It is known that hydronium ions are acidic in nature with concentration of $1 \times 10^{-7} \mathrm{M} / \mathrm{L}$.

Similarly, the hydroxide ions which are basic in nature will be in same concentration as that of hydronium ions. So, as the concentration of basic and acidic elements are equal with the same strength of pH, the combination of these ions lead to formation of pure water with the pH being neutral.

Answer 2

Answer: is the first option (a)