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(8) When 100.0 mL of weak acid HA were titrated with 0.09381 M RbOH, 27.36 mL...

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Chemistry

(8) When 100.0 mL of weak acid HA were titrated with 0.09381 MRbOH, 27.36 mL were required to reach the equivalence point.

(a) Find the molarity of HA.

(b) What is the formal concentration of A- at the equivalencepoint?

(c) The pH at the equivalence point was 10.99. FindpKa for HA.

(d) What was the pH when only 19.47 mL of RbOH has beenadded?

Answer & Explanation Solved by verified expert
4.4 Ratings (885 Votes)
a We know that HA RbOH A Rb H2O 2736 ml RbOH X 009831 mole RbOH 1000 ml NaOH Soln X 1 mole HA 1 mole RaOH 2689 x 103 moles Molarity 2689 x 103 moles 012736 L 0021 M b Since the acid will completely reacts at end point hence the formal concentartion of A is equal to HA 0021 M c and d You are titrating a weak acid with a strong base and want to determine the pH before the equivalence point Thus you have a buffer before the equivalence    See Answer
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