Question

Which of the following is NOT true regarding the primary standard?

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a
b
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d
It must be of high purity.
It must be non-reactive with air or water.
The stoicheometry when reacting must be known.
It must have a small molar mass.

Answer 1

D. "It must have a small molar mass."

Step-by-step explanation:

In the context of primary standards in chemistry, having a small molar mass is not a typical requirement. Primary standards are substances used in titrations to determine the precise concentration of another substance, often an analyte of unknown concentration. The key characteristics of a primary standard are high purity, non-reactivity with air or water, and a known stoichiometry when reacting. The molar mass of the primary standard is not necessarily small; it should be accurately known to perform the required stoichiometric calculations, but the size of the molar mass is not a primary consideration.