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Acids, bases and salt preparations

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Question 38

A student uses the following method to prepare a sample of hydrated copper(II) sulfate crystals:

  • Step 1: Put 50 cm350\text{ cm}^350 cm3 of dilute sulfuric acid into a beaker
  • Step 2: Add copper(II) carbonate until it is in excess
  • Step 3: Separate the dilute solution of copper(II) sulfate from the mixture

The student then obtains crystals from the dilute solution of copper(II) sulfate.

a.

Name a piece of apparatus that could be used to measure the sulfuric acid in Step 1.

[1]
b.

How would the student know when they have added an excess of copper(II) carbonate?

[2]
c.

Name the separation method used in Step 3.

[1]
d.

The student wants to obtain a pure, dry sample of hydrated copper(II) sulfate crystals from the dilute solution. One method is to leave the solution so that all the water evaporates. Describe another method, involving crystallisation, that the student could use.

[4]

Acids, bases and salt preparations Questions

  1. IGCSE
  2. /Chemistry
  3. /Acids, bases and salt preparations