Discussion
One degree Clark of hardness corresponds to
Answer: C
Correct answer: 1 grain of CaCO\( _3 \) per gallon of water
The Clark degree is the old British unit, defined as one grain of calcium carbonate per imperial gallon, which works out at about 14.3 mg/L. It survives in older texts and in some water industry usage. The modern practice is to quote hardness directly in milligrams per litre as calcium carbonate, which avoids the conversion entirely.
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