Make a statement relating hydrogen ion concentration to the acidity and basicity of solutions.

If a solution has more hydrogen ion concentration, the solution is acidic and if a solution has less hydrogen ion concentration, the solution is basic.

Explanation:

To determine the acidity or basicity of a solution, we look at the pH of the solution.

pH is defined as the negative logarithm of hydrogen ion concentration present in the solution.

If the solution has high hydrogen ion concentration, then the pH will be low and the solution will be acidic. The pH range of acidic solution is 0 to 6.9If the solution has low hydrogen ion concentration, then the pH will be high and the solution will be basic. The pH range of basic solution is 7.1 to 14The solution having pH equal to 7 is termed as neutral solution.

Hence, if a solution has more hydrogen ion concentration, the solution is acidic and if a solution has less hydrogen ion concentration, the solution is basic.

The correct option is A.
The law of definite proportion states that a given chemical compound always contains its component elements in fixed ratio irrespective of the source they are obtain from.
For instance, water is made up of two atoms of hydrogen and one atom of oxygen. Water can not be formed in any other way. Combining the oxygen and the hydrogen in another ratio will give us another thing not water.