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Group 2

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Question 2

An industrial wastewater sample contains equal concentrations of dissolved magnesium ions, Mg2+(aq)\text{Mg}^{2+}(aq)Mg2+(aq), and highly toxic barium ions, Ba2+(aq)\text{Ba}^{2+}(aq)Ba2+(aq). An environmental chemist wants to remove the toxic barium ions from the wastewater by selective precipitation, leaving the non-toxic magnesium ions dissolved in the solution.

Which of the following reagents should be added to the wastewater sample to achieve this?

A

Sodium hydroxide, NaOH(aq)\text{NaOH}(aq)NaOH(aq)

B

Sodium sulfate, Na2SO4(aq)\text{Na}_2\text{SO}_4(aq)Na2​SO4​(aq)

C

Sodium carbonate, Na2CO3(aq)\text{Na}_2\text{CO}_3(aq)Na2​CO3​(aq)

D

Nitric acid, HNO3(aq)\text{HNO}_3(aq)HNO3​(aq)

Markscheme

Group 2 Questions

  1. A Level
  2. /Chemistry
  3. /Group 2

14 exam-style questions on OCR A A Level Chemistry Group 2. Each one has a worked solution and a mark scheme showing where the marks go.

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