Calculate the number of moles of calcium ions present in a 50.00 ml water sample that has a hardness of 75.0 ppm (hardness due to caco3)

the answer is either b or c

answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).