Calculate the concentration of the HCl solution.

Question

By titration, it is found that 85.5 mL of 0.177 M NaOH(aq) is needed to neutralize 25.0mL of HCl(aq). Calculate the concentration of the HCl solution.

[HCl]=?M

Answer 1

Note that NaOH and HCl are a strong base and strong acid, respectively. This is a case of a strong acid-strong base titration, which is relatively straightforward, via the following reaction.

NaOH (aq) + HCl (aq) --> NaCl (aq) + H2O (aq)

0.0855 L * 0.177 M NaOH = 0.0151 mol NaOH --> 0.0151 mol OH-

This means that 0.0151 mol of H+ ion is needed to completely neutralize the OH- ion

0.0151 mol H+ ion/0.025 L = 0.604 M HCl

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