Question

A solution contains 0.100 mg of NaOH dissolved in enough water to make 10.0 L of solution.

whats the concentration

Answer 1

given: 0.100mg NaOH.

adding water to make
10.0Liters.

Find : Molarity


Molarity (M)= Moles solute
---------------
Liters of Solution

mol NaOH=0.100g NaOH
multiply
1 mol NaOH
-----------
40 g NaOH
equals= .0025 mol NaOH

Molarity (M) = Moles of solute devided by liters of solution

.0025/10.0L solution= 2.5times ten^ to the negative 4