Compounds that should not be used as primary standards in titrimetric analysis are :
A. $\mathrm{Na}_2 \mathrm{Cr}_2 \mathrm{O}_7$
B. Oxalic acid
C. NaOH
D. $\mathrm{FeSO}_4 \cdot 6 \mathrm{H}_2 \mathrm{O}$
E. Sodium tetraborate
Choose the most appropriate answer from the options given below:

Question

Compounds that should not be used as primary standards in titrimetric analysis are :
A.

\mathrm{Na}_2 \mathrm{Cr}_2 \mathrm{O}_7

B. Oxalic acid
C. NaOH
D.

\mathrm{FeSO}_4 \cdot 6 \mathrm{H}_2 \mathrm{O}

E. Sodium tetraborate
Choose the most appropriate answer from the options given below:

Quantrex Academy · Accepted Answer

Correct answer: D. A, C and D Only

The primary standard is a highly pure stable compound with a known exact composition that can be accurately weighed and dissolved to creat a solution of known concentration.
NaOH is hygroscopic and can't be used.

\mathrm{FeSO}_4 \cdot 6 \mathrm{H}_2 \mathrm{O}

is unstable and can be easily oxidised.

\mathrm{Na}_2 \mathrm{Cr}_2 \mathrm{O}_7

is hygroscopic and can't be used.

Compounds that should not be used as primary standards in...

Options

Correct answer

Step-by-step solution

More from Redox Reactions