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Acids, alkalis and titrations

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Question 7

This question is about the behavior of hydrogen bromide in different solvents.

A piece of magnesium ribbon is added to hydrogen bromide in three separate experiments under different conditions:

ExperimentConditionsObservations
1Hydrogen bromide gasNo visible change
2Hydrogen bromide dissolved in waterThe magnesium gets smaller and bubbles are seen
3Hydrogen bromide dissolved in cyclohexaneNo visible change
a.

Write the formulae of two ions formed in the solution produced in Experiment 2.

  • Positive ion
  • Negative ion
[2]
b.

Identify the gas formed in Experiment 2 and describe a chemical test for it.

  • Gas
  • Test
[2]
c.

Silver nitrate solution and dilute nitric acid are added to the solution produced in Experiment 2.

State the observation and name the substance responsible for this observation.

[2]
d.

Explain why dilute nitric acid is added.

[1]
e.

Explain why there is no reaction in Experiment 3.

[2]

Acids, alkalis and titrations Questions

  1. IGCSE
  2. /Chemistry
  3. /Acids, alkalis and titrations