Chemistry Name :

Test Review: Ch. 19-1 Date :

A. Answer true or false:

_____ 1. Bronsted-Lowry bases form hydroxyl ions in solution.

_____ 2. Arrhenius bases form hydrogen ions in solution.

_____ 3. Arrhenius acids accept a hydrogen ion.

_____ 4. Bronsted-Lowry acids donate a hydrogen ion.

_____ 5. Lewis bases donate an electron pair.

_____ 6. Lewis acids accept an electron pair.

_____ 7. HClO3 is an Arrhenius acid and a Bronsted-Lowry acid

_____ 8. NaOH is an Arrhenius base and Bronsted-Lowry base

_____ 9. H2O – is an Arrhenius acid and an Arrhenius base on;ly (not an acid or base in Bronsted-Lowry

theory)

_____ 10. Al(OH)3 – is a Bronsted-Lowry base only (not an Arrhenius base)

_____ 11. Hydroxyl ions have a greater concentration than hydronium ions in an aqueous solution with a pH is

6.

_____ 12. Weak acids always dissociate to a small extent.

_____ 13. Concentrated acids always have a large amount of acid present compared to the amount of the solvent.

_____ 14. PO43- is the conjugate base of HPO42-.

_____ 15. The hydroxyl ion is the conjugate acid of the oxide ion (O2-).

_____ 16. There are two equivalents in one mole of sulfuric acid (H2SO4).

_____ 17. A salt formed by HNO2(a weak acid) and NaOH (a strong base) will be a hydrolyzing salt that forms an basic solution.

_____ 18. A buffers can be formed from a solution of a HF (a weak acid) and NaF.

_____ 19. Adding sodium carbonate to a saturated solution of lead carbonate will reduce the solubility of the lead carbonate.

_____ 20. Adding a salt with an ion in common to a saturated salt solution will cause a precipitate to form.

For numbers 21-24 refer to the following chemical equation.

CaCO3(s) <=====> Ca2+(aq) + CO32-(aq)

_____ 21. The addition of the salt sodium iodide will cause the above reaction to shift to the right.

_____ 22. The addition of the salt potassium carbonate will cause the reaction to shift to the left.

_____ 23. The addition of the salt sodium chloride will cause the reaction to shift to the left.

_____ 24. The addition of water will cause the reaction to shift the right.

_____ 25. An aqueous solution of sodium chloride will produce an acidic solution (NaOH – strong base, HCl – strong acid).

_____ 26. A solution of potassium nitrite will produce a basic solution (KOH- strong base, HNO2 – weak acid).

27. A 9.70 gram mixture consists of magnesium carbonate powder, magnesium hydroxide powder, solid magnesium metal and solid magnesium bromide. An excess of hydrobromic acid is added to the mixture.

a. Write the chemical reactions for hydrobromic acid the following:

i. MgCO3

ii. Mg

iii. Mg(OH)2

b. If 525 mL of dry carbon dioxide at STP is produced, what is the mass percent of the mixture that is magnesium carbonate?

c. If 350.0 mL of dry hydrogen gas at STP is produced, what is the mass percent of the mixture that is magnesium metal?

d. If 4.33 g of water are produced, what is the percent of the mixture that is magnesium hydroxide?

e. What is the mass percent of magnesium bromide in the above mixture?

Answers : 27b. 20.4% 27c. 3.92% 27d 65.2% 27e. 10.5%