im having a hard time trying to figure out how to find osmolarities and concentrations of solutions. the instructor doesn't do a very good job of explaining it in understandable terms. i'll likely get a tutor, but i've got homework due monday morning, thus i turn to you for help. examples of what i have to do:

How much magnesium chloride and water is needed to make a .05% solution?

Lactated Ringer's solution has the following composition: 130 mM/L sodium, 109 mM/L chloride, 4 mM/L potassium, 1.4 mM/L calcium, and 28 mM/L lactate. What is the osmolarity of lactated Ringer's solution?

I know this stuff isn't the hardest thing in the world to figure out, but right now the dots just aren't connecting. anyone down to help? or anyone in particular i should pm that might?

ibthreaddropslikearock

 

is that (w/w) or (v/v)?

 

ookkayy

 

for your .05% thats Molarity right?

if it is then it's just moles of magnesium chloride/liters of water

 

millimoles / liter , so w/v i guess. i dont know if that answers your question or not, nor if i'm sure of what that means

i know that the molarity of MgCl2 is 95.3. what i don't know is how much water i would need to make it a .05% solution. am i going about this completely wrong?

 

:eek3: Brar does contribute real posts

 

Bah... last semester stuff
that I already forgot...

 

are you sure that 95.3 isn't grams? because I got 95.2 as the molecular weight

if it is molarity, do you have the numbers for how it is 95.3?

 

I was just going to say the same...I think I just shit myself a little h:

 

did you find a four leaf clover in the desert?