An excess of copper(II) oxide is added to dilute sulfuric acid to make crystals of hydrated copper(II) sulfate.

The processes listed may be used to obtain crystals of hydrated copper(II) sulfate.

  1. concentrate the resulting solution
  2. filter
  3. heat the crystals
  4. wash the crystals

Which processes are needed and in which order?

A 1, 2, 3 and 4
B 1,2, 4 and 3
C 2, 1, 2 and 3
D 2, 1, 2 and 4

I know the correct answer is D. I understand that the solution is first filtered to remove excess copper(II) oxide. Then copper(II) sulfate is saturated by adding excess of it. Then filtered again to remove excess. The last step is wash the crystal. Isn't it needed to heat the solution to get crystal? Also is my understanding so far correct?

  • 2
    $\begingroup$ There is no mandatory requirement to heat the solution. Then again, how exactly were you going to concentrate it? $\endgroup$ – Ivan Neretin Mar 27 '19 at 9:09
  • $\begingroup$ @IvanNeretin Been trying to understand the answer for quite some time now. And these are just some assumption I made $\endgroup$ – Jamy Mar 27 '19 at 9:16
  • $\begingroup$ Yes, your understanding is correct. As for the heating, see my previous comment. $\endgroup$ – Ivan Neretin Mar 27 '19 at 9:31

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