Calculating Water Hardness
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Questions and Answers

Which of the following equations can be used to calculate the hardness of water in terms of calcium carbonate?

  • \(\text{Hardness (in terms of calcium carbonate)} = \frac{\text{Concentration of calcium sulphate}},{\text{Molar mass of calcium sulphate}}\)
  • \(\text{Hardness (in terms of calcium carbonate)} = \frac{\text{Concentration of calcium carbonate}},{\text{Molar mass of calcium sulphate}}\)
  • \(\text{Hardness (in terms of calcium carbonate)} = \frac{\text{Concentration of calcium sulphate}},{\text{Molar mass of calcium carbonate}}\) (correct)
  • \(\text{Hardness (in terms of calcium carbonate)} = \frac{\text{Concentration of calcium carbonate}},{\text{Molar mass of calcium carbonate}}\)

    • What is the concentration of calcium sulphate in the water sample?

  • 204 mg/L (correct)
  • 204 mg/mL
  • 204 g/L
  • 204 kg/L

    • What is the molar mass of calcium carbonate?

  • 136.14 g/mol
  • 40.08 g/mol
  • 58.44 g/mol
  • 100.09 g/mol (correct)

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