Question

11-21. The base${\mathrm{Na}}^{+}{\mathrm{A}}^{-}$, whose anion is dibasic, was titrated withHCI to give curveb in Figures 11-4. Is the first equivalence point Hthe isoelectric point or the isoionic point?

Short answer

The first equivalence point is the isoionic point.

Step-by-step solution

The Isoinic point:

The number where a zwitterion molecule seems to have an identical number of positive and negative charges and also no adherent ionic species is found as the isoionic point.

The Isoelectric point:

The isoelectric point (IEP) is the pH value at which the zeta potential is zero. The may be calculated using the Nicomp Z3000 system by titrating the sample and monitoring the zeta potential as a function of pH. Coffee-mate creamer was made by combining 0.1 g with 200 mL of DI water.

The pH number at where the zeta potential is 0 is termed as the isoelectric point (IEP) . Using the Nicomp Z3000 system, the can be estimated by titrating the sample and checking the zeta potential as a function of pH. Coffee-mate creamer was made by combining 0.1 g with 200mL of DI water.

the first equivalence point  the isoelectric point or the isoionic point:

The pH at the first equivalence point can be calculated by calculating the molarity of the pure HCI The average charge is then positive and we can conclude that the first equivalence point is the isoionic point.