Question

Date Prelaboratory Questions in this experiment, you will use a water displacement setup to determine the CO2 produced by an Alka-Seltzer tablet in water. etup to determine the amount of Drug Facts Active ingredients in each tablet Purpose Anhydrous citric acid 1000 mg ..................Antacid Aspirin 325 mg (NSAID)......... ........Analgesic Sodium bicarbonate (heat-treated) 1916 mg.................. Antacid "nonsteroidal anti-inflammatory drug An Alka-Seltzer tablet reacts with water forming bubbles of CO2 from the formation and decomposition of carbonic acid, H.CO. Carbonic acid is what causes carbonation in soft drinks, champagne, etc. You will learn how to write and balance chemical equations as well as predicting the products a bit later this semester. 1. What is the chemical formula of sodium bicarbonate? 2. One Alka-Seltzer tablet weighs 3.24 g. What percent by mass of the tablet is sodium bicarbonate? 3. How many moles of sodium bicarbonate are found from one Alka-Seltzer tablet?

Answer 1

1) The molecular formula is:

NaHCO3.

2) The percentage of bicarbonate is calculated:

% NaHCO3 = 1916 mg * 100/3240 mg = 59.14%

3) The moles are calculated:

n NaHCO3 = g / MM = 1,916 g / 84 g / mol = 0.023 mol

4) The moles of CO2 produced are calculated:

n CO2 = 0.023 mol NaHCO3 * (1 mol CO2 / 1 mol NaHCO3) = 0.023 mol CO2

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