3) 2.0 g of NaOH is dissolved in distilled water to prepare 100 mL solution. 20.0 mL of this solution reaches to the equivalence point when 25 mL of an acid solution containing 1.22 monoprotic weak acid is added. (a) Calculate the molar mass of the unknown acid. unknown

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Chapter16: Acid-base Equilibria
Section: Chapter Questions
Problem 16.146QP: Two samples of 1.00 M HCl of equivalent volumes are prepared. One sample is titrated to the...
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3) 2.0 g of NaOH is dissolved in distilled water to prepare 100 mL solution. 20.0 mL of this solution
reaches to the equivalence point when 25 mL of an acid solution containing 1.22 g unknown
monoprotic weak acid is added.
(a) Calculate the molar mass of the unknown acid.
(b) After 15.0 mL of NaOH solution had been added during the titration, the pH was determined
to be 4.7. What is the Ka of the unknown acid?
(NaOH
= 40.0 g/mol)
Transcribed Image Text:3) 2.0 g of NaOH is dissolved in distilled water to prepare 100 mL solution. 20.0 mL of this solution reaches to the equivalence point when 25 mL of an acid solution containing 1.22 g unknown monoprotic weak acid is added. (a) Calculate the molar mass of the unknown acid. (b) After 15.0 mL of NaOH solution had been added during the titration, the pH was determined to be 4.7. What is the Ka of the unknown acid? (NaOH = 40.0 g/mol)
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