General Chemistry/Reactions of Acids and Bases/Answers

Answers to Reactions of Acids and BasesEdit

  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.