在 pH = 5.0 的 HAc-NaAc 缓冲溶液中,乙酸总浓度为 0.2 mol·L -1 ,计算 PbY 络合物的条件稳定常数。 (已知 HAc 的 p K a = 4.74 , Pb 2+ -Ac 的 lg b 1 = 1.9 , lg b 2 = 3.3 , lg K PbY = 18.04 pH = 5.0 时, lg a Y(H) = 6.45 , lg a Pb(OH) = 0 )
【简答题】完形填空。 Here's a good way to find out where you need the most improvement: check your report card. Don't just look at the 1 . Check the comments your teachers write about each 2 . Very often when studen...
【简答题】阅读理解。 Li Wei's College Dream Li Wei, a 22-year-old young man is named 'Strong Brother' by netizens (网友). He walked on his knees all the way to the 2011 national college entrance examination (高考) room....