Chemistry · Environmental Chemistry
Which of the following is NOT a recognized unit of measurement for water hardness?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Grains per gallon
- 2Grams per gallon✓
- 3Parts per million (ppm)
- 4Milligrams of calcium carbonate per litre (mg/L)
Correct answer
Grams per gallon
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