What mass of hcl, in grams, is neutralized by a dose of milk of magnesia containing 3.26 g of mg (oh) 2? express the mass?

Question

Davin Sparks

Chemistry

11 November, 18:00

What mass of hcl, in grams, is neutralized by a dose of milk of magnesia containing 3.26 g of mg (oh) 2? express the mass?

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Morris · Answer 1

Answer is: mass of hydrochloric acid is 4,08 grams.

Chemical reaction: 2HCl + Mg (OH) ₂ → MgCl₂ + 2H₂O.

m (Mg (OH) ₂) = 3,26 g.

n (Mg (OH) ₂) = m (Mg (OH) ₂) : M (Mg (OH) ₂).

n (Mg (OH) ₂) = 3,26 g : 58,32 g/mol.

n (Mg (OH) ₂) = 0,056 mol.

From chemical reaction: n (Mg (OH) ₂) : n (HCl) = 1 : 2.

n (HCl) = 2 · 0,056 mol = 0,112 mol.

m (HCl) = 0,112 mol · 36,45 g/mol.

m (HCl) = 4,08 g.