0 votes
801 views
in Chemistry Form 4 by

Water containing hydrogen carbonate, HCO3− and calcium Ca2+ ions, is said to be hard water

  1. Describe one way in which HCO3− ions get into river waler (1 mark)
  2. Explain the disadvantage of using this type of water in boilers.  (2 marks)

1 Answer

0 votes
by
  1.   
    • CO2  dissolves in rain water to form Carbonic acid 
    • Carbonic acid reacts with carbonate rock/Ca and Mg forming hydrogen carbonates of Ca and Mg that gets into rivers. 
  2.  The CaHCO3 and MgCO3 decomposes forming CaCO3/scales/fur  lining the boilers and causing poor thermal conductivity/reducing efficiency.
Welcome to EasyElimu Questions and Answers, where you can ask questions and receive answers from other members of the community.

6.4k questions

9.6k answers

6 comments

590 users

...