# Relate phosphamic acid with phosphoric acid [closed]

It is a simple question, but I am not able to figure it out how the formula of phosphamic acid, which is developed from phosphoric acid. In other words, I want to know how to relate it with phosphoric acid? Also in naming some acids we use meta like in, trimetaphosphamic acid, my question is meta is used for what?

## closed as off-topic by Nilay Ghosh, paracetamol, ringo, Wildcat, airhuffApr 24 '17 at 17:47

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An acid $\ce{PONH2(OH)2}$ derived from phosphoric acid by replacement of one hydroxyl group by an amido group is called  phosphamic acid. It is also called phosphoramidic acid