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
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
Content will be erased after question is completed.
Enter the email address associated with your account, and we will email you a link to reset your password.
Forgot your password?