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Calculate the pH when 11 mL of 440 mM KOH is titrated into 324 mL of...

Calculate the pH when 11 mL of 440 mM KOH is titrated into 324 mL of 37 mM weak acid with a pKa of 4.98.

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Answer #1

millimoles of weak acid = 0.037 x 324 = 11.988

millimoles of KOH added = 0.40 x 11 = 4.4

after KOH added

salt formed = 4.4 millimoles

acid left = 11.988 - 4.4 = 7.588 millimoles

total moles = 11 + 324 = 335 mL

[salt] = 4.4 / 335 = 0.013 M

[acid] = 7.588 / 335 = 0.023 M

pH = pKa + log [salt] / [acid]

pH = 4.98 + log [0.013] / [0.023]

pH = 4.73

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