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Related Topic: Sulphur and its Compounds

Related Subtopic: Chemical properties of hydrogen sulphide



Questions 5.4.1(a)

  1. From the demonstration, state with reason whether hydrogen sulphide is acidic or basic.
  2. What is the evidence that hydrogen sulphide reacts with water?


Answers to Questions 5.4.1(a)


  1. Hydrogen sulphide is acidic; its pH is below 7, because it turns blue litmus red.
  2. The turning of blue litmus red, which indicates acidity (or presence of hydrogen ions (H+)), is evidence that the gas has reacted with water to form an acid. It does not occur with dry hydrogen sulphide gas.



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