Question

Describe how you would make a 100mls of a 6M solution of sodium hydroxide, NaOH?

Answer 1

6M means 6 moles in one liter of solution

100ml is a tenth of a liter , so you use 6/10 of a mole of NaOH

measure .6 moles of NaOH ... molar mass * .6

use a graduated container
... add about 60 or 70 ml of water
... add NaOH and dissolve completely
... add water to the 100 ml graduation

Answer 2

Would you then take (0.6 mol NaOH / 1) (39.997g NaOH / 1 mol NaOH) =23.998g NaOH...so then you dissolve 23.998g NaOH in 100mls of water to make a 6M solution?

Answer 3

NO, The definition is mols/L of solution and that's isn't the same as 100 mL water. You put the 24 g NaOH in a 100 mL volumetric flask, add some water, dissolve all of the NaOH, then add water to the mark on the flask. That way you have 100 mL of SOLUTION. Adding 24 g NaOH to 100 mL water makes MORE THAN 100 mL OF SOLUTION and that solution will not be 6 M.