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Which description correctly characterizes the acidity or basicity of a solution?

A. The higher the pH is, the more the hydroxide ion concentration decreases and the more acidic the solution becomes.

B. The higher the pH is, the more the hydroxide ion concentration increases and the more basic the solution becomes.

C. The lower the pH is, the more the hydronium ion concentration decreases and the more acidic the solution becomes.

D. The lower the pH is, the more the hydronium ion concentration increases and the more basic the solution becomes.

Answer: A. The higher the pH is, the more the hydroxide ion concentration decreases and the more acidic the solution becomes.

Basic solutions are solutions with pH higher than 7 while acidic solutions are solutions with pH lower than 7. On the pH scale, the value from 0 to 6.9 indicates that the solution is an acidic one while the value from 7.1 to 14 indicates that the solution is a basic one. With this, a higher pH means a more basic solution. A base is known to dissociate in an aqueous solution to form Hydroxide ions. A higher pH, therefore, means more concentration of Hydroxide ion and therefore, a more basic solution.

Chemistry

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