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Higher Tier
Walking Talking Mark
GCSE Chemistry (Legacy Specification)
Titrations Question
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2. 2KOH(aq) + H2SO4(aq) → K2SO4(aq) + 2H2O(l)
Question – Titrations
Robert carried out a titration to find the concentration of a solution of sulfuric acid cm3 of the sulfuric acid solution was neutralised exactly by 34.0 cm3 of a potassium hydroxide solution of concentration 2.0 mol/dm3. The equation for the reaction is:
2KOH(aq) + H2SO4(aq) → K2SO4(aq) + 2H2O(l)
Describe the experimental procedure for the titration carried out by the student. (6 marks)
ii. Calculate the concentration of the sulfuric acid in mol/dm3. (4 marks)

3. Answer – Titrations
Describe the experimental procedure for the titration carried out by the student. (6 marks)
The sulfuric acid is measure by pipette into a conical flask and the potassium hydroxide is placed in burette. Now note the initial reading and add an indicator, then slowly add the potassium hydroxide from the burette until the end point is reached and note the final reading. Subtract the final reading from the initial reading to obtain the volume of potassium hydroxide.

4. 0.5 moles of H2SO4 react with 1 mole of KOH
Answer – Titrations
25.0 cm3 of the sulfuric acid solution was neutralised exactly by 34.0 cm3 of a potassium hydroxide solution of concentration 2.0 mol/dm3.
Calculate the concentration of the sulfuric acid in mol/dm3. (3 marks)
0.5 moles of H2SO4 react with 1 mole of KOH
moles of H2SO4 in 25 cm3 = 0.068(34x2/1000) × 0.5
so moles H2SO4 in 1 dm3 = (0.068 x 0.5 x 1000)/25 = 1.36 mol/dm3