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2 marksGravimetric Methods of Analysis

CAPE Chemistry Unit 2 · 2014 · Paper 2 · Question 2(d)(i)

A student prepares substance S for gravimetric analysis following Steps 1 to 4: mixing solutions, filtering and washing, heating strongly, and repeating to constant mass.

State the purpose for performing Step 1 and Step 4.

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Other parts of this question

  1. 2(a)(i)Use an arrow to indicate, below the sketch, the direction of increasing frequency.[1 mark]
  2. 2(a)(ii)Identify the region (A, B or C) where EACH of Infrared and X-rays may be found.[2 marks]
  3. 2(b)Calculate the wavelength of electromagnetic radiation with frequency of 4.5 x 10^15 Hz. (Velocity of light = 3.0 x 10^8 m s^-1)[2 marks]
  4. 2(c)State ONE example of the use of gravimetric analysis in quality control.[1 mark]
  5. 2(d)(ii)State TWO pieces of apparatus that should be used in Step 2.[2 marks]
  6. 2(d)(iii)State the apparatus that should be used in Step 3.[1 mark]
  7. 2(e)Calculate the value of x in the formula Na2SO4.xH2O.[4 marks]

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