Calculate the mass of a 10% sodium hydroxide solution required to completely neutralize a solution
August 27, 2021 | education|
Calculate the mass of a 10% sodium hydroxide solution required to completely neutralize a solution containing 4.9 grams of sulfuric acid.
m (H2SO4) = 4.9 g
w% (NaOH) = 10%
m (NaOH) -?
2NaOH + H2SO4 = Na2SO4 + 2H2O, – we solve the problem, relying on the composed reaction equation:
1) Find the amount of sulfuric acid that has reacted:
n (H2SO4) = m: M = 4.9 g: 98 g / mol = 0.05 mol
2) We compose a logical expression:
If 1 mol H2SO4 requires 2 mol NaOH,
then 0.05 mol H2SO4 will require x mol NaOH,
then x = 0.1 mol.
3) Find the mass of the alkali solution:
m (NaOH solution) = n * M = 0.1 mol * 40 g / mol = 4 g.
4) Find the mass of alkali in the solution:
m (NaOH) = 4 g * 0.1 = 0.4 g.
Answer: m (NaOH) = 0.4 g.
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