關務四等101分析化學考古題 請教 - 考試
By Queena
at 2018-03-06T02:50
at 2018-03-06T02:50
Table of Contents
欲由17.5 M醋酸及固體醋酸鈉(C2H3O2Na, 82.03 g/mol)配製250.0 mL醋酸根總濃度為1.00 M,pH=4.90之緩衝溶液,問需醋酸幾毫升?醋酸鈉幾克?(醋酸之Ka=1.75×10^-5)
我的做法:
將1M醋酸根濃度及H3O+濃度代入Ka式
求得醋酸濃度0.72M, 因此取17.5M的醋酸10ml。
而醋酸鈉 1M*0.25L*82.03g/mol=20.5075g。
請問這樣子的做法對嗎
謝謝
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