Question

What charge does a protonated amino group have? Deprotonated?

What charge does a protonated carboxylic acid have? Deprotonated?

Answer 1

What charge does a protonated amino group have? Deprotonated?

Recall that an amino group is typically described as

R-NH2

therefre, when it is not potonated, it will have a 0 charge, i.e. neutral

When a proton is added

R-NH2 + H+

recall that the amino group, NH2 is a base, it can accept H+ (protons)

R-NH3+ is the "protonated" amino group

As you can see, it gets +1 charged.

What charge does a protonated carboxylic acid have? Deprotonated?

Recall that a carboxilic acid will be resperesented as

R-COOH;

As you can see, R-COO- accepted H+ to become the acid, and can donte it to at as an acid (i.e. acid = protons in solution)

The overall charge of the "protonated" carboxilic acid is ---> 0

since R-COOH has 0 charge

when it donates H+, then

R-COO- + H+ are in solution

the deprotonated group is -1 charged