How do you do dilution calculations?
You use the formula
You know that
So, if moles before dilution = moles after dilution,
Example 1. Calculating new concentration
A chemist starts with 50.0 mL of a 0.400 mol/L NaCl solution and dilutes it to 1000. mL. What is the concentration of NaCl in the new solution?
Note: You don't have to convert the volumes to litres, but you must use the same units on each side of the equation.
Example 2. Calculating initial volume
A chemist wants to make 500. mL of 0.0500 mol/L HCl by diluting a 6.00 mol/L HCl solution. How much of that solution should she use?
Hope this helps.