已知：25 ℃时，HCOOH的电离平衡常数K＝1.75×10－5，H2CO3的电离平衡常

已知：25 ℃时，HCOOH的电离平衡常数K＝1.75×10^－5，H₂CO₃的电离平衡常数K₁＝4.4×10^－7，K₂＝4.7×10^－11。下列说法正确的是(　　)

A．向Na₂CO₃溶液中加入甲酸无明显现象产生

B．25 ℃时，向甲酸中加入NaOH溶液，HCOOH的电离程度和K均增大

C．向0.1 mol·L^－1甲酸中加入蒸馏水，c(H^＋)增大

D．向碳酸中加入NaHCO₃固体，c(H^＋)减小

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已知：25 ℃时，HCOOH的电离平衡常数K＝1.75×10－5，H2CO3的电离平衡常

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