移取25.00ml含I[img=~/QImg/2013-10-14-10-14-34/image001.jpg]0.125g的KI溶液,用25.00mlCCl[img=~/QImg/2013-10-14-10-14-34/image002.jpg]萃取,平衡后测得水相中I[img=~/QImg/2013-10-14-10-14-34/image001.jpg]的量为5.00×10[img=~/QImg/2013-10-14-10-14-34/image009.jpg]g,则萃取两次的萃取率是