The relative volumes of chloroform and water that should be used is 9:10
Concentration of solution in chloroform =
( moles of chloroform )
Concentration of solution in water =
( moles of water )
Dissociation constant at
; 
Concentration of solution in chloroform / Concentration of solution in water
Meaning;

Since
mole is present in chloroform and
mole is present in water, Total mole of Caffeine present is 
Now, we substitute our given values into the equation

Therefore, the relative volumes of chloroform and water that should be used is 9:10
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Answer:
Correct answer is B.
Explanation:
Took the test and got this right. :)
Answer:
C. An upward force is created
Explanation:
As an airplane moves forward, the shape of its wing creates lower pressure above the wing than below, yielding a net upward force known as lift.
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Answer:
mettaliods
Explanation:
It has the both property of metal and non metal so it is called mettaliod.