Titration Calculations: Flashcards
Revise titration terms, concordant titres, mole ratios, dilutions and back titrations.
Titration Calculations: Flashcards
- QuestionWhat is a titre?Answer
The volume of solution delivered from the burette to reach the end point.
- QuestionWhat are concordant titres?Answer
Accurate titres that agree closely, usually within 0.10 mL.
- QuestionWhy is the rough titre left out of the mean?Answer
It is only a quick guide to the end point and is usually overshot.
- QuestionGive the equation linking moles, concentration and volume.Answer
n = c × V, with V in litres.
- QuestionWhat is the mole ratio of H₂SO₄ to NaOH?Answer
1 : 2 (H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O)
- QuestionWhat is the difference between the end point and the equivalence point?Answer
Equivalence point: exact stoichiometric amount added. End point: where the indicator changes colour.
- QuestionA 25.00 mL aliquot is taken from a 250.0 mL flask. How do you find the moles in the flask?Answer
Multiply the moles in the aliquot by 250.0 ÷ 25.00 = 10.
- QuestionWhat is a back titration?Answer
A known excess of reagent is added; the leftover is titrated to find how much reacted.
- QuestionIn a back titration, how do you find the moles that reacted?Answer
Moles added − moles left over (found by titration).
- QuestionWhat is a primary standard?Answer
A very pure, stable solid used to make a solution of accurately known concentration (e.g. Na₂CO₃).
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