1. Molarity and Stoichiometry

2. 1.Calculate the number of grams of sodium carbonate that are required to react fully with 125.0 mL of 0.958 M HCl. Na 2 CO 3(aq) + 2HCl (aq) → 2NaCl (aq) + H 2 O (l) + CO 2(g) 0.125L? g 0.125L HClx 0.958 mol 1L x 1 mol Na 2 CO 3 2 mol HCl x 106.0 g 1 mol = 6.35 g Na 2 CO 3

3. 2.How many milliliters of 0.698 M hydrochloric acid are needed to produce 3.4 L of sulphur dioxide gas at STP? Na 2 SO 3 (aq) + 2HCl (aq) → 2NaCl (aq) + H 2 O (l) + SO 2(g) ? mL3.4 L 3.4 L SO 2 22.4 L x 1 mol 1 mol SO 2 x 2 mol HCl 0.698 mol x 1 Lx 1000 mL 1L = 4.3 x 10 2 mL

4. 3.What volume of 0.300 M KOH will neutralize 100.0 mL of 0.200 M H 2 SO 4 1 H 2 SO 4 + 2 KOH → 2 HOH + 1 K 2 SO 4 ? L0.1000 L 0.300 mol x 1L x 2 mol KOH 1 mol H 2 SO 4 x 0.200 mol 1L 0.1000 L H 2 SO 4 = 0.133 L of KOH

5. 4.13.8 L of CO 2 @ STP is dissolved in 250.0 mL of water. What is the molarity of the resulting solution? Molarity = 0.250 L x 1 mol13.8 L CO 2 22.4 L = 2.46 M Video Footage of a Ghost in the Chem Lab