Question

as the ph of the solution increases due to the addition of sodium carbonate, the ph eventually reaches a value of about 8. at this ph the amino group should exist in its:

Answer 1

The pH of the solution has reached the value of 8 (due to the addition of sodium carbonate) which indicates that the solution is now basic.

what is amino?

A colorless gas with a distinctively strong smell, ammonia. Due to its lower density (0.589 times that of air), it is lighter than air. Strong hydrogen bonds between the molecules make it easy to liquefy; the liquid boils at 33.1 °C (27.58 °F) and freezes to white crystals at 77.7 °C (107.86 °F).

Because the amine group itself is a basic group with a lone pair of electrons (present on the N atom) that may grab a proton, the amine group (-NH2) will be protonated in an acidic media and will be changed into (-NH3+). The amine group is still unprotonated and persists as a free amine in the basic solution.

Because of this, amines may dissolve in acidic solutions (pH less than 7) but cannot dissolve in basic solutions (pH greater than 7).

Therefore, the amine group should exist at this pH in its unprotonated state, remaining a free amine.

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