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Chemistry Forums for Students => Analytical Chemistry Forum => Topic started by: marutikmv on July 27, 2006, 08:00:02 AM

Title: monobasic potassium hydrogen phosphate
Post by: marutikmv on July 27, 2006, 08:00:02 AM

Using In HPLC buffers why KH2PO4 is called monobasic. is it because of K+ or any theory

Title: Re: monobasic potassium hydrogen phosphate
Post by: Yggdrasil on July 27, 2006, 04:51:30 PM

Monobasic potassium hydrogen phosphate is KH₂PO₄
Dibasic potassium hydrogen phosphate is K₂HPO₄

It basically has to do with how many equivalents of acid will react with the substance.  Monobasic potassium hydrogen phosphate can react with only one equivalent of acid:

KH₂PO₄ + HCl --> H₃PO₄ + KCl

whereas dibasic potassium hydrogen phosphate can react with two equivalents of acid:

K₂HPO₄ + 2HCl --> H₃PO₄ + 2KCl