Homework Help: chemistry

Posted by Smiley on Saturday, August 18, 2007 at 3:41am.

In precipitating magnesium ammonium phosphate, why can't NH4Cl be used as a substitute for NH3?

Isn't pH critical? The solubility is vastly different at pH 9 versus pH 4.

In addition, how do you obtain NH3 from NH4Cl? The NH3 is for pH adjustment as Bob Pursley writes.

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