A common method of producing a gaseous hydride is to treat a salt containing the

Question

A common method of producing a gaseous hydride is to treat a salt containing the anion of the volatile hydride with a strong acid.

a. Write an equation for each of the following examples:

1. The production of HF from CaF2 and Sulfuric Acid

2. The production of HCL from NaCl and Sulfuric Acid

3. The production of H2S from FeS and Hydrochloric Acid

b. In some cases even a weak acid, such as water, will suffice if the anion of the salt has a sufficiently strong attraction for protons. To demonstrate, write the reaction between Ca3P2 and water to form PH3

Explanation / Answer

this is an acid - base reaction CaF2 + H2SO4 -> 2 HF + CaSO4 NaCl + H2SO4 -> 2 HCl + Na2SO4 FeS + 2 HCl -> FeCl2 + H2S Ca3P2 + 6H2O -> 2PH3 + 3Ca(OH)2

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