Blood plasma has the following composition (milliequivalent per litre.). Calculate its osmotic pressure at `37^(@)C`
`Na^(+)=138,Ca^(2+)=5.2,K^(+)=4.5,Mg^(2+)=2.0,Cl^(-)=105,HCO_(3)^(-)=25,PO_(4)^(3-)=2.2,SO_(4)^(2-)=0.5`,Proteins =`16`, Other =`1.0`

Options

A. 7.47 atm
B. 7.30 atm
C. 7.29 atm
D. 7.40 atm

Answer

A

Explanation

Since for calculating osmotic pressure we required millimoles/litre therefore
`NA^(+)=138,Ca^(2+)=(5.2)/(2)=2.6,K^(+)=4.5,Mg^(2+)=(2.0)/(2)=1.0`,
`Cl^(-)=105,HCO_(3)^(-)=24,PO_(4)^(3-)=(2.2)/(3)=0.73`
`SO_(4)^(2-)=(0.5)/(2)=0.25`,proteins=`16`
other=`1.0`
`Total =294.18 "millimoles/litre"`
`=(294.18)/(1000)=0.294 "moles/litre"`
Now since `pi=CST`
=`0.294xx0.0821xx0.310=7.47 "atm"`