Percent by Mass of Naco3 in Alka-Seltzer

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Lindsey Stockton. 3/2/2013. Section 16093.

Determination of % by mass of NaCO3 in Alka-Seltzer Tablets

Alka-Seltzer is an effervescent antacid typically used for pain relief and neutralizing stomach acid to alleviate indigestion. Alka-Seltzer tablets contain Aspirin, Citric Acid (CH3COOH), and Sodium Bicarbonate (NaCO3). When the tablet is placed in water it undergoes an acid-base reaction and Carbon Dioxide (CO2) is a byproduct that causes the notorious “Fizz”. The objective of the lab was to measure the % of NaCO3 in an Alka-Seltzer tablet in different measures of an acidic solution (Vinegar). Through understanding of stoichiometric relationships and limiting reactants, quantities of substances yielded or consumed in a reaction
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Sources of error include massing the flask with all substances before the reaction was fully completed; which could be the cause for trial 7 (seen table 1) having a lower average % by mass as the vinegar was increasing. Another origin of error would be using two different beakers, the differences in the mass of the beakers affects the lab results of the initial and final massing between

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