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Q.
Sodium pyrophosphate is represented by which of the following formula?
Rajasthan PMTRajasthan PMT 2006
Solution:
Sodium pyrophosphate is represented by $Na _{4} P _{2} O _{7} .$ It is sodium salt of pyrophosphoric acid $\left( H _{4} P _{2} O _{7}\right)$, which may be considered to be made up by two molecules of ortho phosphoric acid $\left( H _{3} PO _{4}\right)$, eleminating one molecule of $H _{2} O$.
$2H_3PO_4 \ce{->[-H_2O]} \underset{\text{Pyrophosphoric acid}}{H_4P_2O_7}$
