十萬火急, osmosis既問題 !

2007-01-08 4:53 am
20% starch solution,50% starch solution, 80% starch solution

放入三支dialysis tubing度(出面都係same amount既distilled water), 咁最後, 係咪三支既水位都會一樣 ?



原因係因為starch唔溶水, 佢唔會影响water potential <--- 咁樣答有冇錯 ?



又有人話, 20%既water potential最低, 所以水會走入去, 佢既水位會最高 <---- 咁答又有冇錯 ? 但我睇書寫starch係唔溶水的, 唔會影响water potential,

咁樣個solution既濃度, 咪同個water potential無關囉 ? 係咪第二個答案就錯左呢 ?




十萬火急, 請儘快解答, 萬分感謝

回答 (2)

2007-01-09 1:42 am
其實你可以將條題目咁睇:

A)20% starch solution -> 80% water
B)50% starch solution -> 50% water
C)80% starch solution -> 20% water

所以water potential of A>B>C,
因為Osmosis係由高water potential去低water potential,
而同時出面係100% water,water potential係最高,
所以出面o既water會入去o的dialysis tubing度;
因為water potential之間o既差別問題,
C係會入得最多水,其次係B,最少係A,
所以應該係80% starch solution o個支o既水位應該係最高,
其次係50% starch solution,最低係20% starch solution。

希望冇諗錯&希望可以幫到你~
2007-01-08 6:09 am
我覺得80% starch solution水位最高,
就算starch係唔溶水的,
佢應該都會佔有一定既value,
咁即係water potential都係底左la~
water potential低,水會走入去,所以佢既水位會最高~

我估係咁la~


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