Why is Ca2+ not a calcium atom and Ca0 is? They both have 20 protons.

Ca2+ is a calcium atom and i never said it wasnt. but really, as a rule of thumb you should refer to Ca+2 as calcium cations and Ca as calcium atoms

Okay. I had just always been instructed to refer to it as calcium metal and not as a calcium atom. (Since that would be really impressive if you could move solitary atoms. )

I tend to agree with jdurg here....I was confused by the use of atom to describe the pure metal.

it would be impressive and that's why i used the word "theoretically"

You've got a reaction between a strong base and strong acid, the product salt will be weak with respect to its influence on pH, insignificant. At equivalence point, pH is 7. Depending on your desired pH add excess of one or the other.

 

Calcium hydroxide will dissolve in acidic solutions (common ion effect).

calcium hydroxide will not dissolve in acidic solutions. calcium hydroxide will react with the acid and the product may be soluble in the resulting conditions.

There are two reactions which will undergo if sodium oxide is put into a beaker of acid, right?

it will form sodium hydroxide

Calcium hydroxide as well as other ionic compounds dissolve to a certain extent in water , the degree to which it dissolves is given by the solubility constant, which indicates its saturation point. The solubility of calcium hydroxide increases in acidic solutions, particularly because one of its electrolyte components is hydroxide which will react with the strongest acid in the mixture. The solution once again becomes unsaturated and more calcium hydroxide solid will dissolve. Now what happens when you have enough acid in the solution? Figure it out.

For excess acid in the solution, all the calcium hydroxide will dissolve due to neutralization .

Yep.

Thank you very much, friends.