1) Solid calcium carbonate reacts with hydrochloric
acid to form water, aqueous calcium chloride, and carbon dioxide gas. If a 45.0 g sample of calcium carbonate is
added to 1.25 L of aqueous hydrochloric acid that is 2.57% hydrogen chloride by
mass (density = 1.13 g/mL), what will be the molarity of hydrogen chloride in the solution after the
reaction is completed? What will be the
pH, and pOH? (Assume that the solution volume remains
constant.)
2) What volume of 0.248 M CaCl2 must be added to 335 mL of 0.186 M KCl to produce a
solution with a concentration of 0.250 M Cl-?
3) The titration of 50.0 mL of a saturated
solution of sodium oxalate, Na2C2O4, requires
25.8 mL of 0.02140 M KMnO4 in acidic
solution. What mass of Na2C2O4,
in grams, would be present in 1.00 L of this saturated solution? In this problem all of the KMnO4
solution reacts with the 50.0 mL of the Na2C2O4
solution.
C2O42- + MnO4- "
Mn2+ + CO2