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| 1. |
define normality? and write the formula |
| Answer» Normality indicates the concentration of the solution. Normality definition is the weight of solute dissolved in a liter of solution. Normality of a solution can be calculated when atomic mass and volume are known. If the composition of solute and solvent are same, the solution is saturated.Normality formula is given by, Normality Formula Multiplying molarity can consider favorable normality calculation by the number of equivalents. Normality (N) = Molarity (M) x number of equivalentsExample 1Determine the normality of 0.1381 mol of NaOH, which is dissolved in 300 mL.Solution- Equivalent solute = 0.1381mol x 1 eq/molSolution = 300mL = 0.300LNormality = 0.1381 x 1 eq/mol 0.300 LTherefore Normality = 0.460 NExample 2- Determine the normality of 0.248mol of H2SO4, which is dissolved in 250mL of solution.SolutionEquivalent solute = 0.248mol x 2eq/molSolution = 250 mL = 0.250LNormality = 0.248mol x 2 eq /mol 0.250LTherefore Normality = 1.984 N<br>Normility : the no. of mole equivalent per litre volumeN = n- factor ×M(molarity) | |