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3 marksIdentification of Cations and Anions

CAPE Chemistry Unit 1 · 2017 · Question 1(d)(i)

Dissolve a spatula-full of R in minimum volume of dilute hydrochloric acid (warming if needed). Dilute with water to half of a test tube. Divide the solution into two portions and carry out the following tests. To the first sample of the solution add NaOH(aq).

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Other parts of this question

  1. 1(a)Heat strongly a small quantity of R and allow to cool. Test for gas evolved. Observe residue.[3 marks]
  2. 1(b)To a small sample of R, add dilute HCl and warm.[2 marks]
  3. 1(c)To another small sample of R, add concentrated H₂SO₄ and heat carefully.[2 marks]
  4. 1(d)(ii)To the second sample of the solution add AgNO₃(aq).[1 mark]
  5. 1(e)Write the chemical formula for the other product formed with water when excess NaOH(aq) is added in (d) (i).[1 mark]

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