Is the presence of calcium ions in water affected by pH?
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Question: Is the presence of calcium ions in water affected by pH? If there is an impact, then within what pH range is the calcium ion content at its highest?
Generally speaking, the pH value can affect the concentrations of many polyprotic anions (carbonate and bicarbonate)； Phosphate ions and hydrogen phosphate ions, etc.), have a low solubility product with calcium ions, making them prone to precipitation and thus affecting the concentration of calcium ions.
What was said on the 2nd floor is correct; pH indirectly affects the Ca content – when pH is high, Ca precipitates and thus its level decreases. But pH isn’t used to control Ca levels, right?
The presence of calcium ions in water should be affected by pH. The lower the pH value, the greater the solubility of calcium ions.
It has an impact; there are formulae for curves, which can be found with a simple search – it’s simply a matter of the ion product
If no other substances are added, the pH level has a direct impact on the concentration of calcium ions; when the pH is above 11, there are significantly fewer calcium ions, especially when the alkalinity is also high. The pH value is lowest under acidic conditions, at which point the calcium ion concentration is highest. Even in closed-loop water systems, in order to prevent scaling while increasing the concentration ratio, aside from adding scale inhibitors, the most effective method is to add acid to reduce the alkalinity of the water, that is, to lower the pH value, thereby allowing the calcium ion concentration to reach very high levels.
Theoretically, it is influenced by this factor: the lower the pH value, the greater the solubility of calcium ions.