A 332.8mL sample of 0.4085M hydrofluoric acid is titrated by 0.7867M strong base; What is the pH after 42.61 mL of strong base has been added?

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Acid Base Titration

An acid-base titration is the method of quantitative analysis for determining the concentration of an acid and base by exactly neutralizing it with a standard solution of base or acid having known concentration.