Calculate the mass of slaked lime that can be obtained from 56 kg of CaO quicklime. In what state

| August 6, 2021 | education

Calculate the mass of slaked lime that can be obtained from 56 kg of CaO quicklime. In what state of aggregation will Ca (OH) 2 be, if we take: a) as much water as is required according to the reaction equation: b) with an excess of water?

First, we write down the reaction equation (to get slaked lime from quicklime, you need to add water):
CaO + H2O = Ca (OH) 2

Let’s find the amount of CaO by the formula N = m / M, where m is the mass of the substance, and M is the molar mass.
N = 56 / (40 + 16) = 1 (kmol)
Now we find the molar mass of Ca (OH) 2:
M = 40 + 2 x (16 + 1) = 40 + 34 = 74
The amount of CaO substance must be equal to the amount of Ca (OH) 2 substance, then the mass of the Ca (OH) 2 substance obtained is found by the formula:
m = M x N = 74 x 1 = 74 (kg)

a) with the amount of water required by the equation, Ca (OH) 2 will be in a solid state.
b) with an excess of water, the resulting substance will gradually dissolve in it.



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.