Chapter 11, Problem 11.57P

(a)

Interpretation Introduction

Interpretation:

Uncertainty in the formula mass of potassium hydrogen phthalate has to be expressed with $95\%$ confidence interval.

Concept introduction:

Uncertainty in formula mass refers to uncertainty occurs in measuring the atomic mass for chemical calculations.  In this theory it is supposed that distribution of atomic mass follows a rectangular distribution so that atomic mass tends to lie equally anywhere between the interval from $\overline{x}-a$ to $\overline{x}+a$ where ‘a’ corresponds to uncertainty in the periodic table.  Rectangular distribution has standard uncertainty of $a/\sqrt{3}.$

(b)

Interpretation Introduction

Interpretation:

Standard uncertainty to be used to verify the purity of the reagent potassium hydrogen phthalate has the mentioned.

Concept introduction:

Uncertainty in formula mass refers to uncertainty occurs in measuring the atomic mass for chemical calculations.  In this theory it is supposed that distribution of atomic mass follows a rectangular distribution so that atomic mass tends to lie equally anywhere between the interval from $\overline{x}-a$ to $\overline{x}+a$ where ‘a’ corresponds to uncertainty in the periodic table.  Rectangular distribution has standard uncertainty of $a/\sqrt{3}.$