Chemistry question?

Question

Potassium Permanganate, 0.18N and Potassium Permanganate, 0.02mol

What is the different?

Answer 1

0.18N refers to the # of molecules in Potassium Permanganate
while the 0.02mol refers to the # of moles in Potassium Permanganate

Answer 2

Normality is an old-fashioned concept that is not used in the UK any more. A 1N solution of KMnO4 is 1/5 of its formula weight dissolved in 1 litre of solution. Or 1/3, depending on the reaction that it is going to do! That's why we don't use it in the UK! So 0.18N is 0.18 x 1/5 (or 1/3) x formula weight grams per litre.

A 1M solution of KMnO4 is the formula mass in grams dissolved in 1 litre of solution, irrespective of the reaction.

0.02 mol is an actual quantity of KMnO4, calculated by multiplying 0.02 x the formula weight of KMnO4.

Answer 3

in the first 0.18N refers to the normality of the solution which denotes how many no. of equivalents are dissolved per litre of the compund in soln.
normality= n*molarity
where n factor is the number electrons participating in redox reactions (here n=7)


in second it is simple molarity given of the solution.


it is important to note that in case of equivalents , the reaction does not alter the no.of equivalents though the number of moles of each participating reactant in the chemical reaction may change.

Answer 4

normality (N) refers to how many mol/L of dissociable reactive groups are contained in a solution of molecules. For example:

M = mol / L

a 1.0 M solution of NaOH is also a 1.0 N solution (with reference to OH-)

but
a 1.0 M solution of Ca(OH)2 is 2.0 N

http://en.wikipedia.org/wiki/Molality#Normality