Question

Suppose your teacher ask you to prepare 250cm³ of 1 Mol dm -³ (1M) of sodium hydroxide for chemistry lesson . How would prepare this solution?

Answer 1

I'm not sure this will help but this is all I know. (Sorry)

To make 1 M NaOH solution, you have to dissolve 40.00 g of sodium hydroxide pellets in 250 mL distilled water and then make up the solution to 1 liter. Weigh 19.95 gm of NaOH pellets & dissolve them in half liter(500ml) of distilled water water, what you will be having now is 1M NaOH solution.

Good luck!

Answer 2

All of what This8thGradeGirl0_0 says is correct except that it doesn't answer the question. Yes, 40 g NaOH pellets dissolved in 1 L of solution is 1 M. The question asks however, for the preparation of 250 cc of 1M. Therefore, dissolve 40/4 = 10 g NaOH pellets in some water, make to a fiinal volume of 250 cc and mix thoroughly. That is 1 M also. I should point out that such a solution will be close to 1 M but probably not 1 M BECAUSE NaOH pellets are hygroscopic (they pick up water from the atmosphere) so when you weigh out 10 g NaOH is isn't pure NaOH; i.e., it is mostly NaOH but you're weighing out some wate with it too.