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The solution should be carefully examined at this point and must be filtered if a precipitate has appeared. Heat the clear solution to boiling; remove the burner and add 25 cc. of a solution of disodium phosphate. Remember that the pyrophosphate finally obtained is from one fifth of the original sample.
An example of a tribasic acid is phosphoric acid, H PO , and here we may have three different classes of salts of three various degrees of basicity or base-saturation. We may have the first step of basicity due to combination with soda, NaH PO , or monosodium phosphate, the second step, Na HPO , or disodium phosphate, and the third, and final step, Na PO , or trisodium phosphate.
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