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5.1 Monitoring chemical reactions

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Question 31

A student dissolves 4.76 g of potassium bromide, KBr, in water to make 400 cm³ of solution. The student transfers 40.0 cm³ of this solution to a volumetric flask and adds water until the total volume is 250 cm³. The relative formula mass, MrM_rMr​, of KBr is 119.0.

Calculate the concentration of the diluted solution in mol/dm3\mathrm{mol/dm^{3}}mol/dm3.

Concentration = ...... mol/dm3\mathrm{mol/dm^{3}}mol/dm3

[3]
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5.1 Monitoring chemical reactions Questions

  1. GCSE
  2. /Chemistry
  3. /5.1 Monitoring chemical reactions

152 exam-style questions on OCR GCSE Chemistry 5.1 Monitoring chemical reactions, covering 5.1.1 The technique of titration, 5.1.2 Theoretical mass, percentage yield and atom economy, 5.1.3 Concentration of a solution in mol/dm3, 5.1.4 Concentration calculations and titration results, 5.1.5 Molar gas volume and volumes of gases in reactions, and 5.1.6 Choosing a reaction pathway. Each one has a worked solution and a mark scheme showing where the marks go.

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