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Edexcel A-Level Chemistry AS 8.23 Core Practical 4 Preparation of a Standard Solution From a Solid Acid and Use It to Find the Concentration of a Solution Questions

Calculate the required mass, dissolve and transfer every portion into a volumetric flask, make to the mark and invert before using a mean titre and mole ratio.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
AS

Exam points

  • Calculate solid mass from target volume, concentration and hydrated molar mass.
  • Describe quantitative transfer, making to the mark and mixing a volumetric flask.
  • Use the mean titre and balanced equation to calculate the unknown NaOH concentration.

Edexcel A-Level Chemistry AS 8.23 Core Practical 4 Preparation of a Standard Solution From a Solid Acid and Use It to Find the Concentration of a Solution Questions question 1

[Maximum number: 1]

Sodium hydroxide solution reacts with carbon dioxide in the air and should be standardised before use. Ethanedioic acid may be used for this standardisation.

A standard solution of ethanedioic acid, (COOH)2(\mathrm{COOH})_{2}, is prepared.
- 2.40 g of solid ethanedioic acid is dissolved in approximately 100 cm3100 \mathrm{~cm}^{3} of deionised water in a beaker.
- The solution is transferred into a 250.0 cm3250.0 \mathrm{~cm}^{3} volumetric flask and made up to the mark with deionised water.

Give a possible reason why any solution remaining in the beaker is washed into the volumetric flask before making up to the mark.
(1)

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