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FromTheMoon [43]
3 years ago
12

Water containing more than 3.0 grains of dissolved solids per gallon is considered to be hard [1 grain (gr) = 64.8 mg]. So, if a

kettle contains 18 gal of tap water, which is allowed to evaporate. The solid material left behind has a mass of 1.7 g. Is such tap water considered to be hard?
Chemistry
1 answer:
Anika [276]3 years ago
6 0

Answer:

  • <em><u>Yes, such tap water is considered to be hard.</u></em>

Explanation:

The <em>solid material left behind</em>, after the <em>18 gal of tap water</em> was <em>evaporated,</em> is the amount of dissolved solids in that quantity of water.

You must convert the amount in grams (1.7g) into grains:

  • 17.g × 1,000mg/g × 1 gr/64.8mg = 262.34 gr

That is in 18 gallons. Then, divide by 18 gal to obtain the number of grains dissolved per gallon:

  • 262.34gr / 18 gal ≈ 15 gr per gallon.

That is much greater than 3.0 grains per gallon; thus,<em> such tap water is considered to be hard.</em>

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