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    Hi, I wanted to query how to answer this question...

    A solution of calcium dihydrogenphosphate, Ca(H2PO4)2, in water acts as abuffer solution. Suggest, with the aid of equations, how this buffering action takes place.

    I am struggling with the equations. Previously in the question it talks about dissociation of the H2PO4- ion (which I got correct), so I assumed this was one of the equations. However, what is the equation for the production of the salt? Once I have these I know how to explain how the buffer works, I'm just struggling to find the two equations!
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    When it acts as an acid, it (the H2PO4- ion) will lose 1x H+

    When it acts as a base it will gain 1x H+.
 
 
 
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