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Acids, bases and salt preparations

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Question 9

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

  • Step 1: Measure 40 cm340\text{ cm}^340 cm3 of dilute nitric acid into a beaker.
  • Step 2: Add copper(II) oxide until it is in excess.
  • Step 3: Separate the unreacted copper(II) oxide from the solution.

The student then obtains crystals from the resulting dilute solution.

a.

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

[1]
b.

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

[1]
c.

Name the separation method used in Step 3.

[1]
d.

The student wants to obtain a pure, dry sample of hydrated copper(II) nitrate 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