3. Alka-Seltzer in water contains principally the antacid sodium citrate and the

Question

3. Alka-Seltzer in water contains principally the antacid sodium citrate and the analgesic sodium acetylsalicylate. The active ingredients (in each tablet) include anhydrous citric acid (1000 mg), aspirin (325 mg) [NSAID (Nonsteroidal Anti-Inflammatory Drug)l, and sodium bicarbonate (Heat-Treated) (1916 mg). a. Calculate the amount in grams of sodium bicarbonate in each tablet b. The antacid in Alka-Seltzer is sodium bicarbonate (NaHCO). It decomposes to form carbon dioxide and sodium hydroxide. Write a balanced equation. Calculate the number of moles of CO: that theoretically should have been produced? c. d. How many liters would this be at STP?

Explanation / Answer

Ans 3

a) 1 mg = 10-3 g

So 1916 sodium bicarbonate = 1916 x 10-3

= 1.916 g

b) The balaced reaction is given as :

NaHCO3 = NaOH + CO2

c) Number of moles of CO2 would be equal to the number of moles of sodium bicarbonate

= 1.916 / 84.007

= 0.0228 moles

d) 1 mole occupies 22.4 L volume at STP

So 0.0228 moles will occupy 22.4 x 0.0228

= 0.51 L

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