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Approximating pKa of Carboxylic Acids

Can someone help with Cii by just approximating the pKa for one of the acids. As for the second part where we're asked to correlate the pKa and the nature of the R group in the Carboxylic Acids.

Could the pKa be attributed to the stability of the conjugate base which is from the R group being able to distribute the -ve charge on the anion when the acid dissiociates (RCOO-)

Thanks!

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Original post by Sam_Chem
Can someone help with Cii by just approximating the pKa for one of the acids. As for the second part where we're asked to correlate the pKa and the nature of the R group in the Carboxylic Acids.

Could the pKa be attributed to the stability of the conjugate base which is from the R group being able to distribute the -ve charge on the anion when the acid dissiociates (RCOO-)

Thanks!



For the first part you need to know that the pKa of the indicator = pH when the indicator is in the mid point of its colour change.

For the second part - you are correct, the stability of the conjugate base one (very good) reason for acid strength (there is also the relative weakness of the bond holding the leaving proton and also solvent stabilisation of the acid and conjugate base.

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