Calculate the masses of calcium hydroxide and hydrochloric acid required to obtain calcium

| March 28, 2021 | education

Calculate the masses of calcium hydroxide and hydrochloric acid required to obtain calcium chloride weighing 222 g, according to the scheme: Ca (OH) 2 + HCl = CaCl2 + H2O

Given:

m (CaCl2) = 222 g

To find:

m (Ca (OH) 2) -?

m (HCl) -?

Decision:

Ca (OH) 2 + 2HCl = CaCl2 + 2H2O, – we solve the problem based on the composed reaction equation:

1) Find the amount of calcium chloride formed during the reaction:

n (CaCl2) = m: M = 222 g: 111 g / mol = 2 mol

2) Find the mass of calcium hydroxide through the first logical expression:

If 1 mol of Ca (OH) 2 gives 1 mol of CaCl2,

then x mol Ca (OH) 2 will give 2 mol CaCl2,

then x = 2 mol,

m (Ca (OH) 2) = n * M = 2 mol * 74 g / mol = 148 g.

3) Find the mass of hydrochloric acid through the second logical expression:

If 2 mol HCl gives 1 mol CaCl2,

then x mol HCl will give 2 mol CaCl2,

then x = 4 mol

m (HCl) = n * M = 4 mol * 36.5 g / mol = 146 g.

Answer: m (Ca (OH) 2) = 148 g; m (HCl) = 146 g.



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