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show curly arrows to show electron flow. + H2N-CH3 HN – CHỦ Ö: thid Base 9. Identify the acids which are strong enough to reaIdentify the acids which are strong enough to react completely with hydroxide or with bicarbonate ion

If C has a lower Pka (5.3) than the bicarbonate ion (6.4) then why does it not react completely? Why is it just D?

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Answer #1

9. Hydroxide ion: A, C, D

Bicarbonate ion: C, D

Explanation: The pKa value indicates the acid strength. Lower the value of pKa, stronger is the acid. For hydroxide ion, the pKa value for the conjugate acid H2O is higher than the compounds shown in A, C and D. Hence they are stronger acids than hydroxide ion to react completely.

For bicarbonate ion, using the same logic both C and D will be stronger acids so that reaction will be complete. The compound shown in C has a low pKa value and should react with bicarbonate ion to give H2CO3. There is no reason for only D to be the answer here.

10. The resonance structure shown in the question is correct.

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