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1- Tap water contains calcium ions. Why dont we use tap water tp dissolve the oxalic acid? Show a chemical equation to ilustate your answer.

2- why will the phenolphthalein eventually fade? show reactions

3- An unknown sample of phosphoric acid was determined by the method of titration. The sodium hydroxide was standardized by titration of 0.133g of oxalic acid dihydrate with 26.37mL of sodium hydroxide. 10.00mL of the unkown acid was titrated to endpoint with 15.83mL of the same solution. What was the concentration of the phosphoric acid?

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