Water containing more than 3.0 gr of dissolved solids per gallon is considered to be hard...
Water containing more than 3.0 gr of dissolved solids per gallon is considered to be hard [1 grain (gr) = 64.8 mg].
A kettle contains 20 gal of tap water, which is allowed to evaporate. The calcium- and magnesium-containing solid material left behind has a mass of 2.1 g.
Part A: What is the minimum mass in grams of dissolved solids in the kettle for the tap water to be considered hard?
Part B: Can the tap water be considered as being hard?
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Water containing more than 3.0 gr of dissolved solids per gallon
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