Chapter 21, Problem 6RAT

When the hydronium ion concentration equals $\text{1 M}$ , what is the pH of the solution? Is the solution acidic or basic?

(a) $\text{pH}=\text{0}$ ; this is an acidic solution.

(b) $\text{pH}=1$ ; this is an acidic solution.

(c) $\text{pH}=10$ ; this is a basic solution.

(d) $\text{pH}=7$ ; this is a neutral solution.

To determine

The correct option for the statement “When the hydronium ion concentration equals $\text{1 M}$ , what is the pH of the solution? Is the solution acidic or basic?”

Answer to Problem 6RAT

The correct option for the statement “When the hydronium ion concentration equals , $\text{1 M}$ what is the pH of the solution? Is the solution acidic or basic?” is option (a).

Explanation of Solution

The pH is used for indicating the acidity of the solution. The concentration of hydronium ions is used for calculating the pH. The pH is calculated by taking the negative log of the concentration of the hydronium ions.

The concentration of the hydronium ions is given as $\text{1 M}$ .

The pH can be calculated as,

$\begin{array}{c}\text{pH}=-\log [{\text{H}}^{+}]\\ =-\log (1)\\ =0\end{array}$

So, the pH is $0$ .

The pH scales ranges from $0-14$ . The pH before $\text{7}$ is for acidic substances. So, the solution is very acidic.

Conclusion:

Therefore, the correct option for the statement “When the hydronium ion concentration equals $\text{1 M}$ , what is the pH of the solution? Is the solution acidic or basic?” is option (a).