predict what would be observed AND WHY from an aqueous mixture of each of the following (all substances are water soluble). :)?

a. potassium carbonate and hydrochloric acid

b. zinc chloride and silver nitrate

c. magnesium chloride and sodium hydroxide

d. ammonium nitrate and sodium hydroxide

2 Answers

  • a. Obs; Effervescence ( liberation of carbon dioxide) . Reason. Acid and carbonate react to liberate CO2 & H2O

    b. Obs : White precipitate of Silver chloride . Classic test for halogens, using silver nitrate.

    c. Obs : White precipitate of magnesium hydroxide. Reason; moost hydroxides , except Group 1 metal hydroxides, are insoluble.

    d. Obs ; No visible effervescence nor ppt. Everything remains in solution.

  • The “why” in all cases is: because that’s what happens.

    a. Carbonates react with acids to form carbon dioxide gas (among other things) so fizz would be observed.

    b. A white precipitate of silver chloride would be observed, because silver chloride is insoluble.

    c. A gelatinous precipitate of magnesium hydroxide would be observed because Mg(OH)2 is insoluble.

    d. A odor of ammonia would be observed, because ammonia gas is liberated.

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