Preparation of standard solutions
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I have a Ca2+ standard solution at 1000 ug/ml, as well as deionized water. I now want to prepare one sample of a 2 ppm standard solution and one sample of a 5 ppm standard solution, converting them into calcium carbonate standard solutions for calibrating the hardness of water. In other words, I need 2 ppm and 5 ppm calcium carbonate standard solutions. I would appreciate any advice from those who know more about this; I’m in urgent need of help. Thank you!
This post was last edited by qugd on 2019-2-25 10:18. Why is a calcium carbonate standard solution needed for measuring water hardness? Could you explain the reasoning? The hardness value is determined by measuring the amount of calcium and magnesium, which is then converted into a value corresponding to calcium carbonate; it is not necessary to prepare a calcium carbonate standard solution as a reference sample. You don’t understand analytical chemistry, do you? How can it still be used as a water quality analysis instrument? It’s made a joke of itself many times already; hurry up and tell the story.
Thank you for your guidance. Handshake: Hardness is determined by the concentration of calcium and magnesium ions in water, and the instrument converts this value into an equivalent value for calcium carbonate. I didn’t express myself clearly; what I meant was to prepare standard solutions with calcium ion concentrations of 2 ppm and 5 ppm, and then convert those values into those corresponding to calcium carbonate