BRAINCAKETitration Calculations - 3
Titrations are often used to find the purity of a solid or its Mr. The solid is weighed, dissolved and made up to 250.0 cm3 in a volumetric flask, and 25.0 cm3 portions (aliquots) are titrated. Because each portion is one tenth of the flask, you must scale up by 10 at the end.
Worked example: 2.00 g of impure sodium hydroxide was dissolved and made up to 250.0 cm3. 25.0 cm3 portions needed a mean titre of 22.50 cm3 of 0.200 mol dm-3 hydrochloric acid. Calculate the percentage purity of the sodium hydroxide.
Sign in free to see the rest of this lesson, the R.E.C.I.P.E. recall steps and the quiz
BrainCake is free. Make an account in seconds and pick up where this page stops.
Key terms in this lesson
- mole
- The amount of substance containing 6.02 x 10^23 particles, the same number as the atoms in 12 g of carbon-12.
More in Amount of Substance and Calculations
- Making a Standard Solution
- Titrations
- The Titration Method
- Indicators
- Concordant Titres and Mean Titres
- Calculating Concentration
- Titration Calculations - 1
- Titration Calculations - 2
All 39 lessons in Amount of Substance and Calculations · All Edexcel AS-level Chemistry topics