Tests for Common Gases2019-01-08T15:04:17+00:00

Edexcel IGCSE (9-1) Chemistry Notes

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Tests for Common Gases

2.44: Describe the tests for these gases: Hydrogen, Oxygen, Carbon Dioxide, Ammonia and Chlorine

Test for Hydrogen

Test for hydrogen

Diagram Showing the Test for Hydrogen

Method:

  • Collect gas into a boiling tube
  • Put lit splint inside

Result:

  • Burns with a ‘Squeaky Pop’ if hydrogen is present

Equation:

2H2 (g)    +    O2 (g)     →     2H2O (l)

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Test for Oxygen

test for oxygen

Diagram Showing the Test for Oxygen

Method:

  • Collect gas into a boiling tube
  • Insert glowing splint

Result:

  • Splint relights if oxygen is present

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Test for Carbon Dioxide

Test for carbon dioxide

Diagram Showing the Test for Carbon Dioxide

Method:

  • Bubble gas through limewater
  • Observe colour change

Result:

  • Limewater turns milky and cloudy if carbon dioxide is present

Equation:

Ca(OH)2 (aq)    +    CO2 (g)     →     CaCO3(s)     +    H2O (l)

Note: The white solid, CaCO3, turns the Limewater Milky

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