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Percentage Yield Question?

So basically, we added hydrochloric acid to a beaker of sodium bicarbonate (baking soda) to form sodium chloride. We added drops of hydrochloric acid until solution stopped bubbling. Then we left the beaker in an incubator overnight. The next day, there were white sodium chloride crystals present, NaHCO3 (s) + HCl (aq) --> NaCl (s) + CO2 (g) + H2O (g). What might cause the percent yield of sodium chloride to be less than 100%? What might cause the percent yield of sodium chloride to be more than 100%? I'm more interested in the LOW percentage yield. Pretty much have the other one figured out. Thanks.

Public Comments

1. Incorrect neutralisation point.Judging the end point by bubbles is not accurate.Impure sodium bicarbonate, which may have been contaminated by water.Weighing errors. More than 100% is not possible. Maybe the salt was not dry, an incubator at 37 C ? will not dry the salt completely, weighing errors.
2. other products are formed so can't be 100% yield of NaCl CO2 and H2O escape as they are gases