By treating 30 g of limestone with hydrochloric acid, 11 g of carbon dioxide were obtained. Calculate the mass fraction of calcium carbonate in natural limestone.
The dissolution reaction of limestone in hydrochloric acid is described by the following chemical reaction equation:
CaCO3 + 2HCl = CaCl2 + CO2 + H2O;
When 1 mol of limestone is dissolved in acid, 1 mol of gaseous carbon dioxide is synthesized. This consumes 2 mol of hydrochloric acid.
Let’s calculate the available chemical amount of carbon dioxide.
M CO2 = 12 + 16 x 2 = 44 grams / mol;
N CO2 = 11/44 = 0.25 mol;
Let’s calculate the weight of the same amount of calcium carbonate.
M CaCO3 = 40 + 12 + 16 x 3 = 100 grams / mol;
m CaCO3 = 0.25 x 100 = 25 grams;
The content of calcium carbonate in limestone will be:
K = 25/30 = 0.833 = 83.3%;
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.