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Chemistry Mass Percent and Stochiometry

Chemistry
Tutor: None Selected Time limit: 1 Day

Using a sample of 0.385 g of Alka-Seltzer, the mass of CO2 is found to be 0.122 g. Calculate and enter response (numerical value only) to three significant figures.

a) % mass of NaHCO3

b) mass of NaHCO3 in tablet assuming mass of tablet is 3.50g

Dec 3rd, 2014

a) Alka-Seltzer is a combination of sodium bicarbonate, aspirin, and anhydrous citric acid, in which only NaHCO3 contains CO2.

The mass ration of CO2:NaHCO3=44:84=11:21

So when the mass of CO2 is 0.122 g, the mass of NaHCO3 is 0.122x 21/11=0.233 g

Therefore, % mass of NaHCO3=0.233/0.385 x100%=60.5%

b) The mass of NaHCO3 in tablet =3.50x60.5%=2.12 g

Dec 3rd, 2014

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