Ca is the chemical symbol for calcium.
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The chemical symbol for calcium is Ca.
The symbol Ca stands for the chemical element calcium, which is a soft gray alkaline earth metal. Calcium is an essential mineral for human health, playing a key role in building strong bones and teeth, as well as muscle function and nerve transmission.
Calcium
Ca(NO3)2Taken from: http://www.fordhamprep.org/gcurran/sho/sho/lessons/lesson53.htm
Hard water is not a chemical compound with a specific chemical symbol. Instead, it is water that contains high levels of dissolved minerals like calcium and magnesium.