To determine the enthalpy change of solution of ammonium chloride, the temperature change is measured and a graph was plotted and extrapolate to found the highest temperature at the point where NH4Cl was just added to water.
To determine the enthalpy change of hydration of magnesium sulphate, Hess's Law is used. Enthalpy change of solution of anhydrous MgSO4 and hydrated MgSO4 was measured.
Why this time a graph is not required to find the highest tempeture/lowest temperature?
MgSO4
2007-01-21 9:08 pm
回答 (2)
2007-01-23 12:03 am
✔ 最佳答案
因為NH4Cl的溶解是吸熱反應(endothermic)，放落水果刻用溫度計測量不到，
一放落水已經開始吸熱，令水溫下降，
所以要畫圖去估返最高溫是什麼時候
參考: me
2007-01-23 4:11 am
It is because the maximum temperature change occurs rapidly and is much smaller.
我之前先做完..呀sir個答案來的=]
希望幫你到^^
我之前先做完..呀sir個答案來的=]
希望幫你到^^
參考: 呀sir
收錄日期: 2021-04-24 22:54:39
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070121000051KK01790