Question

What are equivalents and milliequivalents?

Answer 1

Hint: Equivalent is the amount of substance that reacts with one mole of another substance in a given chemical reaction. The mass of an equivalent is known as equivalent weight. The molecular weight is different from the equivalent weight. Number of equivalents of a given ion in solution is equal to the number of ions multiplied by valency.

Complete Step By Step Answer:
An equivalent can be simply represented as equiv or Eq. the amount of substance can be expressed in different units. One of them is an equivalent. Thus, an equivalent is the amount of substance that can react with a certain amount. Generally, one mole of another substance in a given chemical reaction. The mass of an equivalent is known as equivalent weight.
Equivalents are the moles of ions multiplied by their valency.
In sodium chloride, the equivalents of sodium are one and the equivalents of chlorine is also one, as the valency of both these atoms are one.
In calcium chloride, the equivalents of chlorine are two, calcium has also two equivalents as the valency of calcium is two because it will exist as $ C{a^{ + 2}} $ .
Millie equivalent is $ \dfrac{1}{{1000}}th $ of equivalent. As milliequivalent is equivalent per litre.

Note:
From the equivalents, the equivalent weight can be determined, based on the equivalent weight the concentration factor like normality can be expressed. Equivalent is the product of moles and valency. Thus, $ FeC{l_3} $ has three equivalents of chlorine and the equivalent of iron is also $ 3 $ as iron can donate three electrons.