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

Answer 1 ) Chemical formula of sodium bicarbonate: NaHCO₃

Answer 2) The tablet contains 1916 mg or 1.916g of NaHCO₃

       The % of sodium bicarbonate = (1.916/3.24) x 100

                                                          = 59.13%

Answer 3)     84.007g of NaHCO₃ =1 mole of NaHCO₃    

                        1.1926 g of NaHCO₃ = ?

                                                               = 1.1926/ 84.007

                                                               = 0.014 moles

Answer 4) 0.014 moles of CO₂ is produced

Answer 5) At standard conditions any gas 1 mole of gas occupies 22.4 liiteres or 22,400 ml of volume

                    Therefore 0.014 moles of CO₂ occupies = 0.014 x22400

                                                                                          = 313.6

Answer 6) Yes we can measure 313.6 ml CO₂ with this experimental setup. This much amount of gas is sufficient to displace substantial amount of water.