Answered: Hydrofluoric acid, HF(aq), cannot be…

Chemistry: Principles and Reactions

8th Edition

ISBN:9781305079373

Author:William L. Masterton, Cecile N. Hurley

Publisher:William L. Masterton, Cecile N. Hurley

Chapter4: Reactions In Aqueous Solution

Section: Chapter Questions

Problem 62QAP: Ten mL of concentrated H3PO4 (91.7% by mass, d=1.69g/mL) was accidentally poured into a beaker...

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Question

Hydrofluoric acid, HF(aq), cannot be stored in glass bottles
because compounds called silicates in the glass are attacked
by the HF(aq). Sodium silicate 1Na2SiO32, for example, reacts
as follows:
Na2SiO31s2 + 8 HF1aq2¡ H2SiF61aq2 + 2 NaF1aq2 + 3 H2O1l2
(a) How many moles of HF are needed to react with 0.300
mol of Na2SiO3?
(b) How many grams of NaF form when 0.500 mol of HF
reacts with excess Na2SiO3?
(c) How many grams of Na2SiO3 can react with 0.800 g of HF?

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