Calculate the molarity of NaOH in the solution prepared by dissolving its 4 g in enough water to form 250 mL of the solution.

Explanation

Since molarity (M)= `("NO.of Moles of solute")/("Volume of solution in litres")`
= `(" Mass of Na OH//Molar mass of NaOH")/(0.250 L)`
`(4g//40 g)/(0.250 L)=(0.1"mol")/(0.250 L)`
0.4 mol `L^(-1)=0.4 M` Note that molarity of a Solution depends upon termperature because volume of a solu-tion is temperature dependent.