how would you prepare 300ml of .20M of sodium hydroxid?

Question

I know how to find the mass, i just need to know what steps do i need to do in order to do this. Like what kind of equipment would i need: graduated cylinder, beaker, stuff like that and I need to know how much water do i need in order to do this!!!!! Anyone please! Thanks

.2 is actually the molarity

Answer 1

Equipment is list at the bottom...

There are a couple of ways to do this. You could make some 1.0M NaOH and dilute it 1/5 to make it 0.2M NaOH. That's what I usually do in the lab. That's the practical answer.

The details. OK, so you know NaOH has a molecular weight of 40g per mole. You want .2 moles to make 1L of the stuff, so for 1L you want 8g. For 300mLs you want 1/3 of that or 2.67g. You put 250mLs of water in a beaker, add the NaOH salt, stir until dissolved, then pour it into a graduated cylinder and add water to 300mLs. You could also drop the salt into a 50mL tube of water with a cap, shake it up until it dissolves, and then pour that into the graduated cylinder and bring the volume up to 300mLs.

Stuff you need: OK, do I have to list distilled water? If you use tap water then you get whatever is in the tap water. I only used distilled water. You need to have a scale and a paper to weigh the NaOH. You also need either a beaker, a stir bar, a stir plate and a graduated cylinder, or a 50mL tube with a cap and a graduated cylinder. Don't forget to wear gloves, eye protection and a lab coat if you are really doing this!

Answer 2

sodium hydroxide mass 40
a solution 0.2M contains 0.2*40=8g by liter
for 300ml you need 0.3*8 =2.4
so weigh 2.4g of NaOH put in a cylider and att water to 300ml

Answer 3

If this is a homework question they probably aren't looking for the equipment you need, they are looking for masses or volumes of the substances. Look at an example in your chem. book for examples or examples your teacher gave you.