The standard calculation
2 marks · EasyThe equation for the reaction is:
In a titration, 35.0 cm³ of 0.300 mol/dm³ potassium hydroxide are used. Calculate the number of moles of sulfuric acid that will react with this amount, using the equation.
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0.00525 mol (±0.00001)
Common mistakes: Forgetting 2:1 stoichiometry
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Marking points
M1 · 1 mark · Calculates moles of KOH: (35.0/1000) × 0.300 = 0.0105 mol
A1 · 1 mark · Uses stoichiometry (2:1) to find moles of H_2SO_4: 0.0105 ÷ 2 = 0.00525 mol (follow-through)
Worked solution
Moles of KOH = (35.0/1000) × 0.300 = 0.0105 mol
From the balanced equation, 2 mol KOH react with 1 mol H₂SO₄. So, moles H₂SO₄ = 0.0105 ÷ 2 = 0.00525 mol.