Quelpr
4 marksQualitative Analysis

CSEC Chemistry · May/June 2013 · Paper 2 · Question 1(d)

Table 2 shows tests performed on a substance Q and the observations. Complete the table by inserting the appropriate inferences.

Complete the table by inserting the appropriate inferences.

This question uses a figure or table from the paper — you'll see it when you practise.

The mark scheme is shown once you've answered.

Practise this question

Other parts of this question

  1. 1(a)(i)For EACH temperature in Table 1, calculate the mass of potassium iodide that was dissolved in the beaker of water, and record the value in the space provided.[2 marks]
  2. 1(a)(ii)On Figure 1, plot mass of salt dissolved (solubility) against temperature, and draw a straight line through the points.[3 marks]
  3. 1(a)(iii)From the graph, determine the solubility (in grams per 100 cm³) of potassium iodide at 70 °C.[1 mark]
  4. 1(a)(iv)100 cm³ of distilled water is saturated with potassium iodide at 70 °C. Calculate the mass of potassium iodide that will be precipitated out from solution, if…[2 marks]
  5. 1(a)(v)Calculate the concentration (mol dm⁻³) of a saturated solution of potassium iodide at 30 °C. (RAM: K = 39, I = 127).[3 marks]
  6. 1(b)Explain why the statement above is true.[4 marks]
  7. 1(c)(i)A suggested list of apparatus and chemicals which you will use in obtaining the pure solid sample of EITHER of the two salts.[1 mark]
  8. 1(c)(ii)An outline of the steps for the procedure to be used.[3 marks]
  9. 1(c)(iii)List the MAIN observations that will be expected at EACH stage of the experiment.[2 marks]

More practice: the rest of this paper · more Qualitative Analysis questions · all CSEC Chemistry past papers