what is calcium ion water?
Calcium occurs in water naturally. ... In a watery solution calcium is mainly present as Ca2+ (aq), but it may also occur as CaOH+ (aq) or Ca(OH)2 (aq), or as CaSO4 in seawater. Calcium is an important determinant of water harness, and it also functions as a pH stabilizer, because of its buffering qualities.