[H+HHC0.1-K [HC:0.1 Ko [H] [H]= Ka,K [HC2O] 8×10-2×1×104×0.1 =2.1×103 Ka+[HC2O] 8×102+0.1 看作NaOH滴定H,CO4第一计量点 [T'1g=[OH1+[C021g=C201m=cd,=4.4×10 [D'leg =[H+leg +[H2C2Oleg [C2O leg [H2C204lg=4.4×103-2.1×103=2.3×10 3 2 2 4 2 4 2 4 2 4 2 4 2.1 10 8 10 0.1 8 10 1 10 0.1 [ ] [ ] [ ] [ ] [ ][ ] [ ] [ ] 1 1 2 2 1 − − − − − − + + + − − + = × × + × × × × = + = + = K HC O K K HC O H H K HC O K H HC O H a a a a a 看作 NaOH 滴定 H2C2O4第一计量点 3 3 3 2 2 4 2 2 2 4 2 4 3 0 2 2 4 2 2 4 [ ] 4.4 10 2.1 10 2.3 10 [ '] [ ] [ ] [ ] [ '] [ ] [ ] [ ] 4.4 10 − − − + − − − − − = × − × = × = + = = + = = = × eq eq eq eq eq eq eq eq eq H C O D H H C O C O T OH C O C O cδ