[Twisted_Nucleics]

Hey guys, just a quick question.

I am having a hard time understanding how to finish a calculation because I do not understand some notations and how they are explained in my manual in the equations given. I think I have done everything right up till this point but I just am at a loss.

So this is for a lab report, we did three iterations of salt water in a Weld-type pycnometer, and then had to determine partial molar volume using the weights we got for the pycnometer dry (W₀), weighed with DI water (W_e), and weighed with a NaCl solution we made which was allowed to thermal equilibrate (W).

I have some screenshots, where I am stuck is I cannot figure out how to calculate V1 and V2 because I am confused on the Φ^o and V^o₁ terms. I do not understand what should go here. screenshots are of my excel sheets (only can see the values and sorry its a bit messy , but should be enough to tell what I am doing), a screenshot on the calculations needed from the lab manual, and a screenshot of my procedure from my report just in case anyone needs a better clarification on what I did.

I am posting this under pchem for undergraduates (I have not posted here before I do not think, long time lurker tho) so let me know if this is the wrong place...didn't see a pchem hwk section.

[Twisted_Nucleics]

Well...I see people are viewing, but no one is commenting. Am I missing something that could be useful to solving the problem?

I was looking it over and let's say we ahve an A,B mixture (here salt and water), then,

dV = V_Adn_A + V_Bdn_B

and I could integrate that from 0 to V and on the other side from 0 to n_A and 0 to n_B...holding the composition constant and varying nA,nB simultaneously...

I don't know...it doesnt say anything like that in the manual...

[mjc123]

Well, there are obviously 15 equations before Equation 16; do any of them tell you what φ° and V°₁ are?

[mjc123]

Actually you are told what φ° is, and I strongly suspect that V°₁ is just the molar volume of pure solvent.