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1 markMixtures and Separations

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

You are provided with a mixture of solid sodium sulfate and sodium chloride. Plan and design an experiment to obtain either solid sodium sulfate or solid sodium chloride from the mixture.

A suggested list of apparatus and chemicals which you will use in obtaining the pure solid sample of EITHER of the two salts.

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  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)(ii)An outline of the steps for the procedure to be used.[3 marks]
  8. 1(c)(iii)List the MAIN observations that will be expected at EACH stage of the experiment.[2 marks]
  9. 1(d)Complete the table by inserting the appropriate inferences.[4 marks]

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