Question

Question #69afb

Answer 1

b) `"pH" = 3`

Explanation:

At `"pH"= 3`, glutamate is in the zwitterionic form:

`"HOOC"-"CH"_2-"CH"_2-"CH"-("NH"_3^(+))("COO"^(-))`

and has no net charge, whilst at `"pH"= 2.19`, it has one half net positive charge, at `"pH"= 4.25`, it has about half net negative charge. At `"pH"= 7` it has one net negative charge and at `"pH"= 9.25`, it has a one and half net negative charge.

The more net charges (positive or negative) on the molecule, the better will be the solvation by polar solvents like water.