1.

How is hardness represented?

A. Hardness = 2 ( Ca<sup>2+</sup>) +2( Mg<sup>2+</sup>)
B. Hardness = Ca <sup>2+</sup> + 2 (Mg <sup>2+</sup>)
C. Hardness = 3(Ca <sup>2+</sup>) + Mg <sup>2+</sup>
D. Hardness = 3(Ca <sup>2+</sup>) +2( Mg<sup>2+</sup>)
Answer» B. Hardness = Ca <sup>2+</sup> + 2 (Mg <sup>2+</sup>)


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