2 You have 1110 g of solute Q dissolved in 140mL of water Th

2) You have 111.0 g of solute Q dissolved in 140-mL of water. The distribution coefficient between ether and water for solute Q is 7. What volume of ether would you need to extract 92.0 g of solute Q in one extraction from the original 111.0g dissolved in 140 mL water? Provide answer to closest mL. (Show calculations)

Solution

distribution coefficient = ( mass of solute in ether) / ( ether volume) / ( mass of solute in water / water volume)

let volume of ether = V , we have distribution coeff as 7 , solute in ether should be 92,

hence solute in water = 111 - 92 = 19 g , water volume = 140 ml ,

substituting all values we get V

7 = ( 92/V) / ( 19 /140)

7 x ( 19/140) = 92/V

0.95 = 92/V

V = 92/0.95 = 96.8 ml = 97 ml  

Thus we need 97 ml fo ether