What mass of calcium hydroxide can be obtained by slaking 124 g of burnt lime containing 10% of foreign impurities?

The reaction for the synthesis of slaked lime (calcium hydroxide) from unslaked lime (calcium oxide) is described by the following equation:

CaO + H2O = Ca (OH) 2;

During the reaction, 1 molecule of water is added to 1 molecule of calcium oxide.

Let’s calculate the chemical amount of a substance in 56 kilograms of calcium oxide.

To do this, divide the available weight of the oxide by the weight of one mole of oxide.

M CaO = 40 +16 = 56 grams / mol;

N CaO = 124 x 0.9 / 56 = 1.993 mol;

The same amount of calcium hydroxide will be obtained. Let’s calculate its weight.

To do this, multiply the amount of hydroxide available by the weight of one mole of hydroxide.

M Ca (OH) 2 = 40 + (16 + 1) x 2 = 74 grams / mol;

m Ca (OH) 2 = 1.993 x 74 = 147.48 grams;