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Acids, bases and salt preparations

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Question 6

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

  • Step 1: Put 40 cm340\text{ cm}^340 cm3 of dilute hydrochloric acid into a beaker
  • Step 2: Add cobalt(II) carbonate until it is in excess
  • Step 3: Separate the dilute solution of cobalt(II) chloride from the mixture

The student then obtains crystals from the dilute solution of cobalt(II) chloride.

a.

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

[1]
b.

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

[1]
c.

Name the separation method used in Step 3.

[1]
d.

The student wants to obtain a pure, dry sample of hydrated cobalt(II) chloride 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