6在库仑滴定中,mAs4相当于下列物质多少克?(1)OH,(2) Sb(I到ⅴ价,(3)Cu(到0价,(4)A52O3Ⅲ到V价) 解:根据法拉第电解定律,m=mM 96487n 得:(1) moH 1×103×1×17.01/96487×2)=17.01×5.18 ×109 =88×103g (2)msb=12175×518×10=6.31×10g (3)mcu=6355×518×109=3.29×102g (4)mAs203=19784×518×1092=5.13×107g6.在库仑滴定中,1mA.s-1相当于下列物质多少克? (1)OH- , (2) Sb(III到V价), (3) Cu(II到0价), (4)As2O3 (III到V价). 解:根据法拉第电解定律, 得: (1) mOH-=1×10-3 ×1 × 17.01/(96487 ×2)=17.01 × 5.18 ×10-9 = 8.8 ×10-8g (2)mSb= 121.75 × 5.18 × 10-9= 6.31 × 10-7g (3)mCu= 63.55 ×5.18 × 10-9= 3.29 × 10-7g (4)mAs2O3 = 197.84 ×5.18 ×10-9 /2 = 5.13 ×10-7g n itM m 96487 =