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(7分) (1)在0.1mol/L的NH 4 Cl溶液中,各离子浓度由大到小的顺序是 (2)电解质溶液中存在着多种平衡,现有室温下0.1mol/L的NaHCO 3 溶液,pH=8,回答问题: ①写出溶液中存在的多种平衡(用离子方程式表示) ②下面关系式正确的是________ A.c(Na + ) + c(H + ) = c(CO 3 2 - ) + c(HCO 3 - ) + c(OH - ) B.c(Na + ) > c(HCO 3 - ) > c(OH - ) > c(H 2 CO 3 ) > c(H + ) C.c(OH — ) = c(H + ) + c(H 2 CO 3 ) — c(CO 3 2 - ) D.c(Na + ) = c(HCO 3 - ) + c(H 2 CO 3 )