Normality

a note on normality

1. Presentation on Normality

2. Normality The strength of solution measured in terms of gram equivalent per litre is called normality. It is denoted by N. A solution having 1 gram equivalent of the dissolved solute in 1 litre of its solution is called normal solution.

3. The solution in which 1/10 th gram equivalent of solute is dissolved per litre of its solution,is called decinormal solution i.e ,the solution will have N/10 strength. Normality depends on two factors: a) Dilution b) Temperature

4. Mathematically, N = weight in grams X 1000 equivalent weight expressed in gram X V or, N = strength in gram/ litre gm.eq.wt of the compound

5. NUMERICAL Calculate the normality of x gram of NaOH dissolved in y ml of solution.( eq.weight of NaOH =40) Here, N = weight in gram X1000 eq.wt X V = x X 1000 40 X y

6. NORMALITY FORMULA NORMALITY FORMULA Suppose N1 and V1 are normality and volume of one solution and N2 and V2 are the normality and volume of another solution,then acoording to the law of equivalent, N1 V1 = N2 V2 This is called normality formula.

7. NUMERICAL a mL of an unknown acid required b mL of x N NaOH to reach the equivalence point.Then calculate the normality of unknown acid. Here, According to normality formula, N1V1=N2V2 a X x = b X N2