Hi. I want to make a 40% NaOH solution, but I don't know if it has to be weight/weight, volume/volume or weight/volume? Which molarity will it be?
2007-03-02 02:44:27 · 6 answers · asked by Quake 2 in Science & Mathematics ➔ Chemistry
a percent solution is usually weight to weight
but the density of water is 1 so weight and volume are the same (gm = mL)
400gm in 1L of water = 40%
NaOH has a molecular weight of 40 g/mol
40% solution is 10M (10M x 40 g/mol x 1L = 400 gm NaOH)
be very careful - use safety glasses/gloves/coat
the solution will get very hot
so I would suggest using a PP container and not glass
measure out about 60% of the total volume of water
and add the NaOH slowly
bring the volume up to the final volume
you may notice that less/more water is needed to make
the final volume - this may be due to water in the air or water in the NaOH
this is okay and is captured in the percent and Molarity as this is the molecular component in a set volume
hope this helps
2007-03-02 03:04:18 · answer #1 · answered by biometallica 2 · 1⤊ 0⤋
40% it is usually 40 g for 100mL
this is also 400g for 1L
You weigh 400g put in a flask of 1 liter and adjust water until you have the volume
as the molecular weight of NaOH is 40, the solution will be 10M
2007-03-02 02:53:47 · answer #2 · answered by maussy 7 · 0⤊ 0⤋
By making 100% NaoH solution first and then reducing 60 % in that.
2007-03-03 02:26:51 · answer #3 · answered by ash 2 · 0⤊ 0⤋
40 Sodium Hydroxide
2016-12-12 19:17:27 · answer #4 · answered by ? 4 · 0⤊ 0⤋
If you don't know what the ratio type is, then we can't help you.
2007-03-02 02:47:38 · answer #5 · answered by Tim 4 · 0⤊ 0⤋
ditto.
2007-03-02 02:50:23 · answer #6 · answered by louzadodude 2 · 0⤊ 0⤋