题目

草酸是二元弱酸，草酸氢钾溶液呈酸性。在O.1mol·L－1 KHC2O4溶液中，下列关系正确的是（       ）     A．c(K+)+c(H+) = c(HC2O4－)+c(OH－)+c(C2O42－)    B．c(HC2O4－)+c(C2O42－) = 0.1 mol·L－1 C．c(C2O42－) < c(H2C2O4) D．c(K+) = c(H2C2O4)+c(HC2O4－)+c(C2O42－) 答案：DThe museum to which David _____ his paintings is very beautiful. A. donated B. developed C. tolerated D. selected