Question

1. Identify the chemicals present in the following substances:

a) baking soda

b) vinegar

2. the reaction of ammonium bicarbonate, NH4HCO3, with acetic acid, HC2H2O, in vinegar can be described by the following chemical equation

NH4HCO3(s) + HC2H3O2(aq) = NH4^+ (aq) + C2H3O2^- (aq) + H2O(l) + CO2(g)

an experiment was performed to determine the volume of vinegar required to completely react to a known mass of NH4HCO3. the experimental data were

NH4HCO3,............................... g vinegar, mL

0.62 ...................................... 10

0.85 .............................................. 14

1.14 ............................................ 19

1.31 ............................................ 23

a) using the above data plot the mass of NH4HCO3 on the y-axis versus the corresponding volume of vinegar on the x-axis. Draw the best straight line that passes through the data points and the origin.

b)determine the slope of this line, including the proper units.

c)use the calculated slope, the molar masses of NH4HCO3, and HC2H3O2, and the stoichiometry of the reaction equation to determine the grams of HC2H3O2 present per millimeter of the vinegar used in this experiment.  

d) assuming that the density of the vinegar used in the experiment was approximately 1.0g/mL, determine the mass percent HC2H3O2 in the vinegar.

Answer 1