【Daily Topic】【HVAC Version 20160709】
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Participation reward: 2 Wealth. Reward for the correct answer: 9 Wealth. Which of the following statements is incorrect? ( ) a. Magnesium calcium bicarbonate can be converted into a precipitate when water is heated to boiling; this is known as temporary hardness. b. Carbonate hardness is approximately equal to temporary hardness. c. Non-carbonate hardness is approximately equal to permanent hardness. d. Hardness is part of alkalinity, and sodium salt alkalinity is also referred to as negative hardness
c. Non-carbonate hardness is approximately equal to permanent hardness
b. Carbonate hardness is approximately equal to temporary hardness
d. Hardness is part of alkalinity; sodium salt alkalinity is also known as negative hardness
d. Hardness is part of alkalinity; sodium salt alkalinity is also known as negative hardness
d. Hardness is part of alkalinity; sodium salt alkalinity is also known as negative hardness
d. Hardness is part of alkalinity; sodium salt alkalinity is also known as negative hardness