Question

acetic acid 0.921% (w/w) 100grams. The acetic acid will be measured by weight. how much is used?

Answer 1

What does (w/w) mean?

Answer 2

weight in weight

Answer 3

@aaronq come in here.

So im guessing it means : \[\sf \frac{0.921 ~g~C_2H_3O_2}{100~g~comp}\]

Answer 4

i sent the actual question above. with 4 answers..

Answer 5

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

Answer 6

oh i see how it works now

Answer 7

from that picture posted, it's A and C, because of the units

Answer 8

okay, coooool

Answer 9

so its a and c? why?

Answer 10

because of the units, 0.921 g = 921 mg

Answer 11

ok. thank you so much.. both of you ..

Answer 12

Are you willing to help me understand other questions?

Answer 13

no problem guyses, idk if you're asking me, but if so, you should post in the chem section

Answer 14

im asking either of of you

Answer 15

if not, would you really consider this chem?

Answer 16

yeah

Answer 17

its actually pharmacy compounding math

Answer 18

pharmacy is based from chem and bio

Answer 19

are you willing to help me understand a few other questions ?

Answer 20

yep

Answer 21

ok thank you i will post the next question

Answer 22

kk

Answer 23

if possible explanations please.

Answer 24

I am trying to get some of these done before work tomorrow

Answer 25

along with understanding them

Answer 26

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.

Answer 27

what about the second question

Answer 28

i should have just read that one. that was common sense but im old..

Answer 29

is the answer to 17. 6.25ml?

Answer 30

sorry, i had to step away from the keyboard. yes, that's the answer. you basically just have to watch the units

Answer 31

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

Answer 32

here is another one if you can help thank you

Answer 33

which one?

Answer 34

i need to do all 3 questions? so what ever you can help with

Answer 35

well one is d

Answer 36

so 2 and 3

Answer 37

b) is 400 mg

0.02*20 g =0.4 g = 400 mg

Answer 38

wow thank you.. at least i can see it now

Answer 39

for c) you add the whole masses and make a dilution

\(2\%*20g=x\%*(20~g+30~g+30~g)\rightarrow x\%=0.5\%\)

Answer 40

lol sorry that sounds to weird, i meant "add all the masses" not "the whole.." lol

Answer 41

add all the grams

Answer 42

yep

Answer 43

grams is a unit of mass

Answer 44

you are a great help.. can you help with a few more? i dont want to over welcome my help

Answer 45

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.

Answer 46

ok thank you so much