Question

a 88.06 g sample of calcium hydroxide is dissolved in enough water to make 1.520 liters of solution. calculate the volume in ml of this solution that must be diluted with water in order to make 2.100 l of 0.250 m calcium hydroxide. what is the coefficient of your answer in scientific notation?

Answer 1

First, let's calculate the number of moles of calcium hydroxide in the initial solution:

88.06 g Ca(OH)2 = 88.06/74.093 g/mol = 1.188 mol Ca(OH)2
To make 2.100 L of 0.250 M solution, we need:

2.100 L x 0.250 mol/L = 0.525 mol Ca(OH)2
Let's call the volume of the initial solution that we need to dilute "V":

V x (1.188 mol/1.520 L) = 0.525 mol/2.100 L
Solving for V, we get:

V = (0.525 mol/2.100 L) x (1.520 L/1.188 mol) = 0.336 L = 336 mL
The coefficient of this answer in scientific notation is 3.36 x 10^2.