The molarity, therefore, is directly proportional to the amount of solute in solution and indirectly proportional to the volume of the solution.

What happens to molarity if volume increases?

Molarity is an intensive property of a solution so it remains same no matter you calculate it by taking a solution filled beaker or by taking only a spoonful amount. No, solute will not decrease if volume will decrease. But molarity will increase for sure, cause molarity is the amount of solute in litre of solution.

What increases molarity?

Add the required amount of the solute to the solution to increase the molarity of the solution. For example, to increase the molarity of one liter solution of water and sodium chloride from two to four, add the moles of solute required to increase the molarity by two.