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I have a question in Chemistry. What exactly is Normality ? I mean I am confused about the different masses involved. We have mass of solute ,molar mass of solute ,again equivalent mass. What we have to do actually ??

I have a question in Chemistry. What exactly is Normality ? I mean I am confused about the different masses involved. We have mass of solute ,molar mass of solute ,again equivalent mass. What we have to do actually ??

Grade:11

1 Answers

Aarti Gupta
askIITians Faculty 300 Points
9 years ago
Normality – Normality is the number of gram equivalents of the solute present in 1000 ml or 1L of the solution. Mathematically it is expressed as-

Normality = G-equivalents of solute
Volume of solution(L)
where,
G-equivalents of solute = Mass of solute
GEM(solute)
Here, GEM is the gram equivalent mass which is defined as the quantity of substance whose mass in grams is equal to its equivalent mass.It is also called one gram-equivalent.For ex- Equivalent mass of oxygen = 8
1 g-equivalent of oxygen = GEM of oxygen = 8g of oxygen
10 g-equivalent of oxygen =10 * GEM of oxygen = 80g of oxygen
thus,
Normality = Mass of solute (g)
GEM(solute) *Volume of solution(L)
Unit of Normality = g-equivalents/L

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