Test your skills on the following problems.

**Problem:** How many milligrams of NaCN are required to prepare 712 mL of 0.250 M NaCN?

**Problem:** How many moles of Ca^{2+} ions are in 0.100 L of a 0.450 M solution of Ca_{3}(PO_{4})_{2}?

**Problem:** How many chloride ions are present in 65.5 mL of 0.210 M AlCl_{3} solution?

a) 4.02 x 10^{23} chloride ions

b) 5.79 x 10^{24} chloride ions

c) 2.48 x 10^{22} chloride ions

d) 8.28 x 10^{21} chloride ions

e) 1.21 x 10^{22} chloride ions

**Problem:** To what final volume would 100 mL of 5.0 M KCl have to be diluted in order to make a solution that is 0.54 M KCl?

**Problem:** If 880 mL of water is added to 125.0 mL of a 0.770 M HBrO_{4} solution what is the resulting molarity?

**Problem:** Consider the following balanced redox equation:

H_{2}O + 2 MnO_{4} ^{–} + 3 SO_{3}^{2–} ----> 2 MnO_{2} + 3 SO_{4}^{2– }+ 2 OH ^{–}

How many __ grams__ of MnO

**Problem:** Iron (III) can be oxidized by an acidic K_{2}Cr_{2}O_{7} solution according to the net ionic equation:

Cr_{2}O_{7}^{2–} + 6 Fe^{2+} + 14 H^{+} -----> 2 Cr^{3+} + 6 Fe^{3+} + 7 H_{2}O

If it takes 35.0 mL of 0.250 M FeCl_{2} to titrate 50 mL of a solution containing Cr_{2}O_{7}^{2–}, what is the molar concentration of Cr_{2}O_{7}^{2–}?

**Problem:** Vinegar is a solution of acetic acid, CH_{3}COOH, dissolved in water. A 5.54 g sample of vinegar was neutralized by 30.10 mL of 0.100 M NaOH. What is the percent by weight of acetic acid in the vinegar?

**Problem:** What is the molar mass of a 0.350 g sample of a monoprotic acid if it requires 50.0 mL of 0.440 M Ca(OH)_{2} to completely neutralize it?

**Example:** Give the __ complete ionic equation__ for the reaction (if any) that occurs when aqueous solutions of sodium sulfide and copper (II) nitrate are mixed.

**Example:** Give the net ionic equation for the reaction (if any) that occurs when aqueous solutions of H_{2}SO_{4} and KOH are mixed.

**Example:** Give the __ net ionic equation__ for the reaction (if any) that occurs when aqueous solutions of Na