Nicli

There is a new edition coming out in January for people taking the NAPLEX next year.

Hey, I just looked at another forum and it said that 0.56 is the correct answer, but apparently it says 1.629 in the book. Here is how I did it: the goal freezing point is -0.52 to make the soln isotonic. the fp of 2.5% procaine hcl is 0.122*2.5= 0.305 so -0.52--0.305= -0.215--> how much NaCl we must add to make it isotonic with proportions, 1% NaCl/x = -0.58/-0.215 x= 0.371% NaCl needed to make soln isotonic 0.371% x 150cc= 0.56g NaCl

what is the answer? I kind of know how to do it, but I want to make sure I am getting the right answer. I got 0.56g sodium chloride. If it is the right answer I will explain it.

That makes sense, good job. :) -

Nope, I got 222mg also.

You need to do alligations for this problem: 78| | 28 | 38 | 10| | 40 68 total so basically you need 28 parts of the 78%, and 40 parts of the 10% to get 68 parts of the 38%. 28mL/68mL x 50mL= 20.6mL of the 78% 40mL/68mL x 50mL= 29.4mL of the 10% Hope this is right. -

No, the 1000, 1400, and 1800 are referring to the times that the infusion is given- 10am, 2pm, and 6pm.

I'm sure you probably do not need this by now, but for other people: If 400mg is in 500 mL, and there are 3 doses per day, then: 1mL/25mg x 400mg/dose x 3 doses= 48mL= 2.4 ampules per day

Usually each dose is in seperate 50mL bags, therefore if 50mL is given over 0.5 hours, then the answer is 100mL/hr regardless of how much Pen is in each bag.

I tried that calculation, and I came up with 0.8mg/day as well. the only possible way I can think of getting 1.6 is if they thought there were 10 drops/mL, but that does not make any sense. Is it possible that the book is wrong?