A 24.5 mL sample of a 0.376 M aqueous hypochlorous acid solution is titrated with a 0.487 M aqueous potassium hydroxide solution. What is the pH at the start of the titration, before any potassium hydroxide has been added?

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26-07-2022
Chemistry

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A 24.5 mL sample of a 0.376 M aqueous hypochlorous acid solution is titrated with a 0.487 M aqueous potassium hydroxide solution. What is the pH at the start of the titration, before any potassium hydroxide has been added?

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aryanagarwal466 aryanagarwal466 · Answer 1 · 2022-08-08T19:56:57+02:00

The pH of the solution when no base is added is 0.424.

An aqueous solution's acidity or basicity can be determined using the pH scale. The pH values of acidic solutions are typically lower than those of basic or alkaline solutions.

The chemical formula of hypochlorous acid is HClO.

1 mole of HClO produces 1 mole of hydrogen ions and 1 mole of fluoride ions.

KOH (aq) + HClO (aq) → KClO (l) + H2O (l)

To calculate the pH of the solution when no base is added, we use the equation:

[tex]p_{H} = - log {H}^{+}[/tex]

We are given:

[tex]H^{+} = 0.376 M[/tex]

Putting values in the above equation, we get:

[tex]p_{H} = - log (0.376)[/tex]

[tex]p_{H}[/tex] = 0.424

Hence, the pH of the solution when no base is added is 0.424

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