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2 marksMixtures and Separations

CSEC Chemistry · May/June 2011 · Paper 2 · Question 2(b)(ii)

Magnesium chloride and potassium nitrate have ionic lattice structures. Figure 2 shows their solubility curves.

Calculate the mass of potassium nitrate that would be deposited when its saturated solution is cooled from 80 °C to 20 °C.

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Other parts of this question

  1. 2(a)Complete Table 3 to show the structure and conductivity of EACH solid substance listed. The first one is done as an example.[6 marks]
  2. 2(b)(i)Which of the two compounds, magnesium chloride or potassium nitrate, has the GREATER solubility at 15 °C?[1 mark]
  3. 2(b)(iii)Determine the temperature at which the solubilities of magnesium chloride and potassium nitrate are equal.[1 mark]
  4. 2(c)Draw the bonding diagram to show how magnesium combines with chlorine to form magnesium chloride.[2 marks]
  5. 2(d)Based on the use and purpose of solid air fresheners, would you classify them as having simple molecular, giant covalent, or ionic lattices? Explain your…[3 marks]

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