Anyone remember chem calculations?

[Crazy Hippos]

---

Members don't see this ad.

1

 

[No Imagination]

I know this isn't a tutoring forum, but I totally forgot how to do this chem calculation and was hoping some of my fellow pre-vets would remember..

How do you prepare a 5% hydrazine solution from a 64% hydrazine solution?

V1C1 = V2C2

(dont know how to do subscripts here)

Basically, V = your volume, C = your concentration
1 = initial
2 = final

Didn't tell me how much you wanted to make up, so lets say 100 mL

so, (64%)x = (5%)(100 mL)

x = 7.81 mL of 64% solution into 92.1 mL water (I rounded, not sure how exact you have to be)

Think that is right, I will have to do it on paper to make sure 100%

But V1C1 = V2C2 is your friend!

EDIT: By the way, this can obviously be used for any type of value, substitute % for M for m, it will be fine as long as you are not going from one to a different one.

 

[redsteven]

hooray for proportions 🙂

 

[1Vista1Grey]

haha.. ouch.. so glad Im not taking any chem courses right now..