單項選擇題
Fe3+與Sn2+反應(yīng)的平衡常數(shù)對數(shù)值(lgK)為()
A.(0.77-0.15)/0.059
B.2×(0.77-0.15)/0.059
C.3×(0.77-0.15)/0.059
D.2×(0.15-0.77)/0.059