General Chemistry/Reactions of Acids and Bases/Answers

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Answers to Reactions of Acids and Bases[edit]

1. Equimolar solutions of sodium biphosphate and potassium hydroxide are mixed.
2. Equimolar solutions of sodium biphosphate and hydrochloric acid are mixed.

3. Excess sulfur dioxide gas is bubbled into a dilute solution of sodium hydroxide. Acid is then added.
4. Aluminum chloride is dissolved into water.

5. Sodium fluoride is dissolved into water. Strong acid is then added.

Neutral. Ca2+ is the conjugate of a strong base and SO42- is the conjugate of a strong acid.

6. Solid calcium oxide is exposed to a stream of sulfur trioxide gas. If the resulting compound is dissolved, will the solution be acidic, basic, or neutral?

A cloudy precipitate forms, as silver chloride is not soluble.

7. Gaseous hydrogen chloride is bubbled into a solution of silver nitrate.

Gas bubbles form.

8. Ammonium chloride crystals are dissolved in water. Sodium hydroxide is then added.

A cloudy precipitate forms, as calcium carbonate is not soluble.
Hint: The hydroxide reacts with the bicarbonate to form water, then the resulting carbonate reacts with calcium.

9. Calcium hydroxide crystals are dissolved into a solution of sodium bicarbonate.

They have formed a Lewis adduct. Aluminum chloride is a very strong Lewis acid.
Phosphine is a Lewis base because there is a non-bonding pair of electrons on the P that can be donated.

10. Phosphine gas is sprayed onto pebbles of aluminum trichloride.