Crack DAT Science Test #1 GC

[toothhornet88]

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I just do not understand this question at all? Please someone help
For some reason i cannot post the picture up

http://flic.kr/p/a5ZrK3

 

[oocytecryo]

This problem is also a good one for QR skills. First notice that we're dealing with Normality, so look at the number of ions generated in the solution. For this particular problem, each solution has 1 OH- made for each molecule, so Normality is as the coefficient states for the purposes of the problem. Now it can be set up as an awesome QR problem. I pretended that we were making 1L of this final solution for simplicity.

So make the volume for the first one X, and the volume of the second 1-x (since you are making a total solution of 1L)

.2Mx + .3(1-x) = .24

Working that out, I get x= 0.6
So the (1-X)= 0.4
So the ratio of the two volumes is 6:4, which is 3:2!

Yay Math!

I scribbled this out quickly on a sticky at work, can someone else confirm?

 

[toothhornet88]

This problem is also a good one for QR skills. First notice that we're dealing with Normality, so look at the number of ions generated in the solution. For this particular problem, each solution has 1 OH- made for each molecule, so Normality is as the coefficient states for the purposes of the problem. Now it can be set up as an awesome QR problem. I pretended that we were making 1L of this final solution for simplicity.

So make the volume for the first one X, and the volume of the second 1-x (since you are making a total solution of 1L)

.2Mx + .3(1-x) = .24

Working that out, I get x= 0.6
So the (1-X)= 0.4
So the ratio of the two volumes is 6:4, which is 3:2!

Yay Math!

I scribbled this out quickly on a sticky at work, can someone else confirm?

oh wow sweet thanks! I guess if they're asking for a ratio using 1 Liter is perfect 😀