Solution of task 8 of Chemistry Book Shimanovich 2003

If the total amount of your purchases from the seller Михаил_Перович more than:
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- 100 $ the discount is 10%
- 50 $ the discount is 7%
- 20 $ the discount is 5%
- 10 $ the discount is 3%
- 5 $ the discount is 2%
- 1 $ the discount is 1%

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8. Calculate the equivalent and equivalent mass of H3PO4 in the formation reactions:
a) hydrophosphate;
b) dihydrogen phosphate;
c) orthophosphate.