Molarity

Molarity
1. A saline solution contains 2.50 mol of NaCl in 2L of water. What is the molarity?
2. What moles of Na2CO3 is needed to prepare 1.25 L of a 0.75M solution?
pH, [H+], or [OH-]
3. Find the pH of each solution.
a. [H+] = 1 x 10-4 M

b. [H+] = 0.0015 M

4. Calculate the [H+] for each solution.
a. pH = 5.00

b. pH = 12.83

5. Calculate the pH of each solution.
a. [H+] = 5.0 x 10-5 M

b. [OH-] = 8.3 x 10-10 M
Balancing Chemical Equations
6.

__ KClO3 ! __ KCl + __ O2

7. __ Ca + __ H2O ! __ Ca(OH)2 + __ H2
8. __ Fe + __ O2 ! __ Fe3O4
9. __ C6H14 + __ O2 ! __ CO2 + __ H2O
10. __ AlCl3 + __ AgNO3 ! __ Al(NO3)3 + __ AgCl
11. __ HCl + __ CaCO3 ! __ CO2 + __ H2O + __ CaCl2
12. __ WO3 + __ H2 ! __ W + __ H2O

Mole Conversions
13. Find the molar mass of the following:
a. KNO3

d. oxygen gas

b. (NH4)2CO3

e. Ca(NO3)2

c. Ag2CrO4

f. PbSO4

14. Convert from g to moles or from moles to g. Show units.
a. 12.0 g Fe to moles

b. 25.0 g of Cl2 gas to moles

c. 0.15 moles NaNO3 to g

d. 0.0280 moles NO2 to g

15. Determine the moles of H2 from 2.5 moles of O2: 2 H2 + O2 → 2 H2O

16.Determine the moles of O2 from 5 grams of H2O: 2 H2 + O2 → 2 H2O

17. Determine the moles of H2 from 25 grams of O2: 2 H2 + O2 → 2 H2O