Explain the standard naoh solution has been added

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Question- In the titration of 25.0 mL of 0.10 M HCL with 0.10 M NaOH, calculate the pH: (a) after 20.0 mL of th standard NaOH solution has been added; and (b) after 30.0 mL of the standard NaOH solution has been added.

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