In some articles, the PKa values for malachite green dye reported 6.9. On the other hand, in some other articles, reported 10.3. Now, which one is true?
Is it possible that a substance has two PKa values?
Of course it is possible that a substance has two pKa values. That is always the case when you can formally put two protons on it which is the case for malachite green. The two transitions can even be found in the Wikipedia article:
https://en.wikipedia.org/wiki/Malachite_green
Of course it is possible that a substance has two pKa values. That is always the case when you can formally put two protons on it which is the case for malachite green. The two transitions can even be found in the Wikipedia article:
https://en.wikipedia.org/wiki/Malachite_green
I agree fully with Jürgen Weippert here. For the specific question if a substance can have 2 pKa values. Yes and more...For example H3PO4 has three pKa values...
Of course. It depends on the number of protons of the substance.
of course, the Ka value depends on the experimental temperature also. if the temperature changes, the Ka value also changes for a substance.
Keerthanan Santhirasekaram The number of pKa values is independent on temperature, but the value of each pKa does depend.
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