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Question

What is meant by black ash in chemistry?


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Solution

Black ash:

  • Black ash is the mixture of impure Sodium carbonate Na2CO3 and Calcium sulfideCaS.
  • Black ash is produced when Carbon C is added to Sodium sulfate Na2SO4 which leads to the conversion of sulfate into sulfide.
  • This process is known as Leblanc's process.
  • The chemical reactions are depicted below:

Na2SO4(aq)+2C(s)Na2S(aq)+2CO2(g)Na2S(aq)+CaCO3(aq)Na2CO3(aq)+CaS(s)


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