2) One way of making sodium chloride is according to the following unbalanced equation:
Na(s) + Cl2(g) → NaCl(s)
In a reaction, a student mixed 3.00 grams of Na(s) with 6.2 grams of Cl2(g), making 7.60
grams of NaCl. Balance the equation and determine which, if any, of the starting materials
was in excess? . [Molar mass (g/mol): Na = 22.99, and Cl = 35.45]
3) If 27.0 mL of 0.25 M NaCl aqueous solution are mixed with 36.0 mL of 0.42 M Ca(NO3)2
aqueous solution. Is there a reaction taking place? Find the molarity of each ion present in the
final solution.
4) Vinegar contains acetic acid (HC2H3O2), which is responsible for its acidity. In one analysis,
a 20.00 mL sample of vinegar was titrated with 0.50 M NaOH(aq). It required 35.5 mL of this
sodium hydroxide titrant to neutralize the acid in the vinegar sample. If 1.000 liter of this
vinegar weighs 1.008 kg, what is the percent, by weight, of acetic acid in this vinegar sample?
. [Molar mass (g/mol): C = 12.01, H = 1.008, Na = 22.99, and O = 16]
5) A 50.0 mL sample of 18.0 M sulfuric acid was diluted with enough water in a volumetric flask
to make 5.00x10^2 mL of solution. A 50.0 mL aliquot of this solution was then further diluted
to a volume of 2.50x10^2 mL. What is the molarity of the solution after the second dilution?