Answers

2016-01-03T17:05:14+05:30
Calcium and magnesium dissolved in water are the two most common minerals that make water "hard." The hardness of water is referred to by three types of measurements: grains per gallon, milligrams per liter (mg/L), or parts per million (ppm).
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2016-01-03T18:46:11+05:30
Dissolve it in soap.... if u get foam very easily, its soft.... elese not
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