To a 4L of 0.2M solution of NaOH, 2L of 0.5 M NaOH are added. The molarity of resulting solution is :

The molarity of a solution formed by mixing of two solution is calculated by following equation. 1 1 2 2 mix 1 2 M V +M V M = V +V mix 0.2 4 0.5 2 0.8 1 M 0.3M 4 2 6 x x >>