What would be the resulting molarity of a solution made by dissolving 31.3 g of Ca(OH)2 in enough water to make a 1050 mL solution?

English , i don't understand spanish.

The answer is 5 10 15

Well you can immediately rule out a and d because if a metal were to lose or gain protons, then it would become a different element all together. the answer here is b because the positive symbol with a number refers to how many electrons the metal can give away to become stable.