Average human blood serum contains 18 mg of K+ and 365 mg of Cl- per 100 mL.?

Question

a) calculate the molar concentration for each of these species; use 1.00 g/mL for the density of serum.

b) pK and pCL for human serum.

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i'm confuse about what to do with the density and i don't know how to even approach the pK and pCl ... can someone help explain or give me an idea of how to approach this problem.

thank you :))

Answer 1

The density is the same as water, 1000mg/1ml=1000g/1000ml

Soooo....

-the concentration of K+ is 180mg/1000ml=180mg/1000g serum=0.180g K+/1000g serum

----divide 0.180g by the molecular weight of Potassium=moles Potassium

-------that is in 1000ml so=molar concentration of K+

-concentration of Cl- is 3.65g Cl-/1000g serum

----divide 3.65 by molecular weight of Chloride=moles Chloride

-------so you know the molar concentration of Cl-

pK=18/1000

pCl=365/1000