Question

A.A 9.99 g sample of an aqueous solution of hydrochloric acid contains an unknown amount of the acid.
If 12.3 mL of 0.674 M potassium hydroxide are required to neutralize the hydrochloric acid, what is the percent by mass of hydrochloric acid in the mixture?

% by mass

B. A 8.37 g sample of an aqueous solution of perchloric acid contains an unknown amount of the acid.
If 22.9 mL of 0.323 M barium hydroxide are required to neutralize the perchloric acid, what is the percent by mass of perchloric acid in the mixture?

% by mass

Answer 1

не + кои - 4) — К * R 0. — of kon I mol is neutralise balance 1 mol of required to “, моlg of Ru - оl q of Қоң. — moles of kor= - = volume of koulu x 14.3 х10-3 х 0.6 24 8.3х10 Pro L. Molarity of kon то 1 — моlu of Hig = %: 3 х 10 то 1 — , uput of Le - - 2 ole of tx моlоg иласе оf се 6.3 х103 1 х 3 O. 303 т. — So, weight % = -- mass of nee x100 mass of solution О. 303 1 х Do = > 3 •1. 4. 998 Рио + Вqt o4). — Ba 1 C 10ч 1, + 2H20 1 mol of Ba(OH), дwl of Ruo to neutralise required — 2x moles of Balonla = moles of nulou 7.

moles of l Bal04)2 = volume of Bal 04/2 (L) x Molarity = , qх 10 - 3 (о. 3 23) - 1.4 хто мо. Hton moles nagles of Hoq = 2 x 7.4x10-3 14.8 x to 301 Marc of H Uо : по lе of H Cloq x urlag плое оf Кру - 1 ч. 3 х 10 - 3 шо) x 1 бр. 5 2 1 по 1 — 2 1.5 . •/° мака та с оf ноу хію Mas_oft solutbл Mass •1. – Т.5 4 x ) = 18 •I. В. 28-

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