Question

Regading molarity, which of the following statements are correct
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a) units of molarity gm-moles kg-1
b) molarity of dibasic acid is half of its normality
c)Normality × GEW/ GMW
d) Molarity always equals to its Normality
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Answer 1

Explanation:

Molarity =

Molar mass of solute V (in mL)

Mass of solute×1000

∴ Unit of molarity is molL(power-1)

or mol dm(power-3)

Normality = n × Molarity, for dibasic acid n=2

∴ Molarity =

2

Normality

Molarity =

GMW

Normality×GEW=

GMW

Mass per dm cube

Hence, statements (b) and (c) are correct.