Question

Which statement is true for a solution when its concentration of hydronium ions increases?

Answer 1

Answer:

Its pH value decreases.

Explanation:

∵ pH = - log[H₃O⁺]

• As, concentration of hydronium ions increases, pH value decreases and the solution be more acidic.

• So, the right choice is: Its pH value decreases.

Answer 2

Answer: Its pH value decreases.

Explanation: pH is the measure of acidity or alkalinity of a solution.

pH is calculated by taking negative logarithm of hydronium ion concentration. Acids have pH ranging from 1 to 6.9 and bases have pH ranging from 7.1 to 14.

$pH=-\log [H_3O^+]$

$pH=log\frac {1}{H_3O^+}$

Thus as pH and $H_3O^+$ are inversely related, a solution having lower pH will have more amount of $H_3O^+$ concentration. And a solution having more pH will have less amount of $H_3O^+$ concentration.

Thus when concentration of hydronium ions increases, the pH of the solution decreases and the solution becomes more acidic.