This worked example covers Worked Example — Titration Calculation within Titrations (HT) for GCSE Chemistry. Revise Titrations (HT) in Quantitative Chemistry for GCSE Chemistry with 22 exam-style questions and 20 flashcards. This topic shows up very often in GCSE exams, so students should be able to explain it clearly, not just recognise the term. It is section 5 of 14 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
🧮 Worked Example — Titration Calculation
Question: 25.0 cm³ of sodium hydroxide solution was titrated with 0.100 mol/dm³ hydrochloric acid. The mean titre was 22.50 cm³. Calculate the concentration of NaOH.
Equation: NaOH + HCl → NaCl + H₂O
n = c × V (where V is in dm³)
n = 0.100 × (22.50 ÷ 1000)
n = 0.100 × 0.02250
n = 0.00225 mol HCl
NaOH : HCl = 1 : 1
So moles NaOH = moles HCl = 0.00225 mol
c = n ÷ V
c = 0.00225 ÷ (25.0 ÷ 1000)
c = 0.00225 ÷ 0.0250
c = 0.0900 mol/dm³
Practice questions for Titrations (HT)
What is the purpose of a titration?
Explain why the burette should be rinsed with the acid solution before filling it for a titration.