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I need help with a math problem?
Here is the problem:
I need to calculate the amount of KCL needed to qs 600mls of LRS to 24meq/L. (KCL is 2 meq/ml).
I need help with setting up the problem. Thanks for the help.
2 Answers
- 1 decade agoFavorite Answer
I'm not sure of all of your terminology, but I will solve the problem with this assumption: You want to dilute KCL from its original concentration of 2 meq/ml down to 24meq/L by adding it to 600 ml of some other solution.
Let x=600, the volume of LRS (measured in ml)
and y be the volume of KCL to add (ml)
and z be the meq within that y volume
Then z/(x+y) = 0.024 meq/ml
and z/y = 2 meq/ml
We now have three equations for three unknowns. Substitute x=600 and z=2y to get 2y/(600+y)=0.024 or 2y = (600+y)*0.024
Now get 1.976y=14.4
So the amount of KCL to add is y=7.287 ml
