Chapter 15, Problem 15.9P

Interpretation Introduction

Interpretation:

Value of $\text{pH}$ expected when electrode C is placed in solution with $\text{pH}$ as 11 has to be given.

Concept Introduction:

In order to make effective use of the glass electrode, it must be calibrated before the measurement of $\text{pH}$. For this purpose, the glass electrode is dipped in a standard buffer that has $\text{pH}$ of 7. Further, after its usage glass electrode must be stored in an aqueous medium of reference electrode to prevent any dehydration.

Sodium error refers to an apparent low value for $\text{pH}$ when $\left[{\text{Na}}^{+}\right]$ is high or when $\left[{\text{H}}^{+}\right]$ is low. In such a situation $\left[{\text{Na}}^{+}\right]$ is also sensed by glass electrode and this leads to sodium error.