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If the hydrogen ion concentration of an unknown solution is 7.89E-4, what is its pH and will this form an acid or a base?

User Shikiryu
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1 Answer

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27 votes

Answer

The pH of the solution is 3 and this will form an acid.

Step-by-step explanation

If the hydrogen ion concentration, [H⁺] of an unknown solution is 7.89E-4, then the pH of the solution can be calculated using the pH formula below.

pH = -log[H⁺]

Putting [H⁺] = 7.89E-4, we have;


\begin{gathered} pH=-log(7.89*10^(-4)) \\ \\ pH=-(-3.10) \\ \\ To\text{ }the\text{ }nearest\text{ }whole\text{ }number, \\ \\ pH=3 \end{gathered}

The pH of the solution is 3 and this will form an acid because the pH value falls between the acidic range, (0.1 to 6.99)

User Markbratanov
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