Question

how can I differentiate between dilution and molarity questions?

example please

Answer 1

Dilution is a technique used to obtain a desired concentration (molarity,molality etc) of solute in a particular solvent.

Molarity is defined as moles of solute present in 1 L of solution.

Example:

1. How much water needs to be added to reduce the concentration of 40 ml of 0.5 M NaOH to 0.2M?

Here,this is a dilution problem since we are getting our desired concentration and applying m1v1=m2v2 , we can calculate v2

2. Calculate the molarity of 20g NaOH in 500ml solution?

This is a molarity problem where you calculate moles of solute and then divide it by volume of solution(in L).