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草酸是二元弱酸,KHC2O4溶液呈酸性.对于0.1mol/L KHC2O4,下列关系正确的是(  )

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c(K+)+c(H+)=c(HC2O4)+c(OH)+c(C2O42)    c(HC2O4)+c(C2O42)=0.1 mol·L.-1    c(C2O42—)>c(H2C2O4)  c(K+)=c(H2C2O4)+c(HC2O4)+c(C2O42)  
c(K+)+c(H+)=c(HC2O4)+c(OH)+c(C2O42 )   c(HC2O4)+c(C2O42)=0.01 molL1   c(C2O42 )<c(H2C2O4)   c(K+)=c(H2C2O4)+c(HC2O4)+c(C2O42 )  
c(K)+c(H)=c(HC2O4)+c(OH)+c(C2O42)   c(HC2O4)+c(C2O42)=0.1mol·L-1   c(C2O42)>c(H2C2O4)   c(K)=c(H2C2O4)+c(HC2O4)+c(C2O42)  
c(K+)+c(H+)=c(HC2O4-)+c(OH-)+c(C2O42-)
  
c(HC2O4-)+c(C2O42-)=0.1mol・L-1
  
c(C2O42-)>c(H2C2O4
  
c(K+)=c(H2C2O4)+c(HC2O4-)+c(C2O42-)  
c(K+)+c(H+)=c(HC2O.4)+c(OH)+c(C2O.42-)  c(HC2O.4)+c(C2O.42-)=0.1 mol·L.-1   c(C2O.42)<c(H2C.2O.4)  c(K+)=c(H2C.2O.4)+c(HC2O.4)+c(C2O.42)  
C(K+)+C(H+)=C(HC2O4¯)+C(OH¯)+ C(C2O42-)    C(K+)=C(HC2O4¯)+2C(C2O42-)    C(K+)= C(H2C2O4)+C(HC2O4¯)+ C(C2O42-)   V.≧20mL  
c(K+)+c(H+) = c(HC2O4)+c(OH)+c(C2O42)   c(HC2O4)+c(C2O42) = 0.1 mol·L.-1   c(C2O42) < c(H2C2O4)   c(K+) = c(H2C2O4)+c(HC2O4)+c(C2O42)  
V(NaOH) = 0时,c(H)=1×10—2mol/L   V(NaOH) <10mL时,一定存在c(Na)=c(C2O42)+c(HC2O4 )   V(NaOH) = 10 mL时,c(H) = 1×10—7 mol/L   V(NaOH)>10 mL时,c(Na)>c(C2O42)>c(HC2O4 )  
V(NaOH) = 0时,c(H) = 1×10-2 mol·L.-1  V(NaOH)<10 mL时,不可能存在c(Na) = 2c(C2O42 )+c(HC2O4 )  V(NaOH) = 10 mL时,c(H) = 1×10-7 mol·L.-1  V(NaOH)>10 mL时,c(Na)>c(C2O42 )>c(HC2O4 )  
c(K+)+ c(H+)=c(HC2O4)+c(C2O42)+c(OH)   c(HC2O4) > c(H2C2O4) >c(C2O42)   c(K+)=c(HC2O4)+c(C2O42)+c(H2C2O4)   c(HC2O4)+c(C2O42)=0.1mol/L  
c(K+)+c(H+) = c(HC2O4)+c(OH)+c(C2O42)   c(HC2O4)+c (C2O42) = 0.1 mol·L1   c(C2O42) < c(H2C2O4)   c(K+) = c(H2C2O4)+c(HC2O4)+c(C2O42)  
c(K+)+c(H+) = c(HC2O4)+c(OH)+c(C2O42)    c(HC2O4)+c(C2O42) = 0.1 mol·L.-1   c(C2O42) < c(H2C2O4)   c(K+) = c(H2C2O4)+c(HC2O4)+c(C2O42)  
c(K+)+c(H+) = c(HC2O4)+c(OH)+c(C2O42)   c(HC2O4)+c(C2O42) = 0.1 mol·L.1   c(C2O42) < c(H2C2O4)   c(K+) = c(H2C2O4)+c(HC2O4)+c(C2O42)  

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