Acid cleaners (1 Viewer)

pine-apple01320

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when comparing acid cleaners; in particular looking at citric acid in removing stains, how do we know which pka value to use to compare the strength of the cleaner as opposed ot other acid cleaners like acetic or formic acid (as it has three hydrogen ions it could potentially donate?)
 

jazz519

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We normally only take the first dissociation (so Ka1). This is because every successive ionisation of the acid, it actually ionises less. So this means the 2nd and 3rd dissociations are usually considerably less (sometimes like 10000 or 1000000 times less ionised). So that means pKa1 is the important info as Ka1 > Ka2 > Ka3
 

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