anonymous
  • anonymous
acetic acid 0.921% (w/w) 100grams. The acetic acid will be measured by weight. how much is used?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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Jhannybean
  • Jhannybean
What does (w/w) mean?
anonymous
  • anonymous
weight in weight
anonymous
  • anonymous
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Jhannybean
  • Jhannybean
@aaronq come in here. So im guessing it means : \[\sf \frac{0.921 ~g~C_2H_3O_2}{100~g~comp}\]
anonymous
  • anonymous
i sent the actual question above. with 4 answers..
aaronq
  • aaronq
acetic acid 0.921% (w/w) 100 grams. means that there is 0.00921*100 g =0.921 g of acetic acid and 100 g - 0.921 g = 99.079 g of solvent
Jhannybean
  • Jhannybean
oh i see how it works now
aaronq
  • aaronq
from that picture posted, it's A and C, because of the units
aaronq
  • aaronq
okay, coooool
anonymous
  • anonymous
so its a and c? why?
aaronq
  • aaronq
because of the units, 0.921 g = 921 mg
anonymous
  • anonymous
ok. thank you so much.. both of you ..
anonymous
  • anonymous
Are you willing to help me understand other questions?
aaronq
  • aaronq
no problem guyses, idk if you're asking me, but if so, you should post in the chem section
anonymous
  • anonymous
im asking either of of you
anonymous
  • anonymous
if not, would you really consider this chem?
aaronq
  • aaronq
yeah
anonymous
  • anonymous
its actually pharmacy compounding math
aaronq
  • aaronq
pharmacy is based from chem and bio
anonymous
  • anonymous
are you willing to help me understand a few other questions ?
aaronq
  • aaronq
yep
anonymous
  • anonymous
ok thank you i will post the next question
aaronq
  • aaronq
kk
anonymous
  • anonymous
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anonymous
  • anonymous
if possible explanations please.
anonymous
  • anonymous
I am trying to get some of these done before work tomorrow
anonymous
  • anonymous
along with understanding them
aaronq
  • aaronq
so, v/v means volume by volume, it's pretty straight forward that in 100 mL of 50 % v/v glycerin solution there is 50 mL of glycerin.
anonymous
  • anonymous
what about the second question
anonymous
  • anonymous
i should have just read that one. that was common sense but im old..
anonymous
  • anonymous
is the answer to 17. 6.25ml?
aaronq
  • aaronq
sorry, i had to step away from the keyboard. yes, that's the answer. you basically just have to watch the units
anonymous
  • anonymous
its ok . i am trying to do this, which most has nothing to do with what i do at work. and thank you so so much
anonymous
  • anonymous
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anonymous
  • anonymous
here is another one if you can help thank you
aaronq
  • aaronq
which one?
anonymous
  • anonymous
i need to do all 3 questions? so what ever you can help with
anonymous
  • anonymous
well one is d
anonymous
  • anonymous
so 2 and 3
aaronq
  • aaronq
b) is 400 mg 0.02*20 g =0.4 g = 400 mg
anonymous
  • anonymous
wow thank you.. at least i can see it now
aaronq
  • aaronq
for c) you add the whole masses and make a dilution \(2\%*20g=x\%*(20~g+30~g+30~g)\rightarrow x\%=0.5\%\)
aaronq
  • aaronq
lol sorry that sounds to weird, i meant "add all the masses" not "the whole.." lol
anonymous
  • anonymous
add all the grams
aaronq
  • aaronq
yep
aaronq
  • aaronq
grams is a unit of mass
anonymous
  • anonymous
you are a great help.. can you help with a few more? i dont want to over welcome my help
aaronq
  • aaronq
I would but i have to go do laundry and stuff. Hopefully someone else can come help ya, if you can't find help here, try the chem section.
anonymous
  • anonymous
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anonymous
  • anonymous
ok thank you so much

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