NEW 6/2014. Which of the following is NOT a suitable property of primary standard material?Select one:O a. Cheap with reasonable solubilityO b. React rapidly, completely and selectively with analyteO c. Large molar massO d. Ultrapure, greater than 99%.

Answered: NEW 6/2014. Which of the following is…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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NEW 6/2014. Which of the following is NOT a suitable property of primary standard material?
Select one:
O a. Cheap with reasonable solubility
O b. React rapidly, completely and selectively with analyte
O c. Large molar mass
O d. Ultrapure, greater than 99%.

Expert Solution

Step 1

For different analytical purposes, standards for a substance is used based on a few ideal features it provides. These can be primary or secondary standards.

Step 2

Some the desirable properties in a primary standard material have been mentioned below.

High purity of the substance.
The stability posed by the substance, that is, it has to have low reactivity.
The substance should have low hygroscopicity so that the weight change upon absorption of moisture is very less.
High equivalent weight or molar mass can reduce errors during weighing.
The availability of the substance matters. A substance, to be used as a primary standard, must be readily available and cheap.
The substance should not be toxic.
Atmospheric stability and reasonable solubility in a titration medium make a substance more suitable for it be used as a primary standard.

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