Question

For water-insoluble but acid-soluble compounds, what reaction(s) occur with HCl to bring these compounds into solution?

a) Precipitation
b) Neutralization
c) Hydrolysis
d) Acid-base reaction

Answer 1

Water-insoluble but acid-soluble compounds undergo an acid-base reaction with HCl, leading to neutralization reactions that form water and soluble salts.

Step-by-step explanation:

For water-insoluble but acid-soluble compounds, the reaction(s) that occur with HCl typically involve an acid-base reaction. When these compounds are treated with hydrochloric acid, a chemical reaction occurs where the acid donates protons (hydrogen ions, H+) to the insoluble base, forming soluble salts and water. This process is a type of neutralization reaction, where the acid and the base react to form water and a salt, which is soluble in water thus bringing the compound into solution.

For example, magnesium hydroxide, Mg(OH)2, is insoluble in water but reacts with hydrochloric acid as follows:

• Mg(OH)2(s) + 2HCl(aq) → MgCl2(aq) + 2H2O(l)

Here, magnesium chloride, MgCl2, is formed which is soluble in water. The overall reaction is a combination of a hydrolysis reaction, where the metal hydroxide reacts with water, and the resulting hydroxide ions then react with the hydrogen ions from the HCl leading to the neutralization to form water.