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What is another reagent other than phosphoric acid that can be used to determine the concentration of calcium ion by a conductometric method? What is the important criterion? (Check solubility rules)

The reaction used in the experiment is:
Ca(OH)2 (aq) + H3PO4 (aq) yields Ca3(PO4)2 (s) + H2O

What other reagents work the same way as phosphoric acid?

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