A NaOH (aq) solution with a pH value of 13 is used to determine the molarity of a HCl (aq) solution. A 10.0-mL sample of the HCl (aq) is exactly neutralized by 16.0 mL of 0.100 M NaOH (aq). During this laboratory activity, appropriate safety equipment was used and safety procedures were followed. Determine the pH value of a solution that has a H + (aq) ion concentration 10 times greater than the original NaOH (aq) solution.

Question

Chemistry

Patrick Hobbs

24 March, 12:58

A NaOH (aq) solution with a pH value of 13 is used to determine the molarity of a HCl (aq) solution. A 10.0-mL sample of the HCl (aq) is exactly neutralized by 16.0 mL of 0.100 M NaOH (aq). During this laboratory activity, appropriate safety equipment was used and safety procedures were followed. Determine the pH value of a solution that has a H + (aq) ion concentration 10 times greater than the original NaOH (aq) solution.

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Answers (1)

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Bernard Lang · Answer 1

pH of the H⁺ (aq) is 0

Explanation:

It is possible to know the concentration of a HCl (aq) solution by titration with a solution of NaOH (aq) with known concentration. The reaction is:

HCl (aq) + NaOH (aq) → H₂O (l) + NaCl (aq)

The added moles of NaOH are equal to moles of HCl and as you know volume of HCl added you will obtain concentration of HCl.

Now, a solution of H⁺ (aq) with a concentration 10 times greater than original NaOH (aq) solution - 0.100M-, has a concentration of 1.00M H⁺ (aq), the pH of this solution is:

pH = - log (1.00M H⁺ (aq) = 0

That means pH of the H⁺ (aq) is 0