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#12 ofwQ The hardness of a water sample is a measure of Select one O a. the total concentration of cations present in the sample O b. the sum of concentrations of calcium and magnesium ions in the sample O c. the sum of concentrations of all ions, cations and anions, in the water sample O d. the concentration of calcium ions in the water sample O e. the concentration of sulfate and carbonate ions in the water sample

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Answer #1

Answer is option b. The sum of concentrations calcium and magnesium ions in the sample.

The water hardness is due to the dissolved cation like calcium and magnesium ions present in the water

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