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（1）有下列物质①Cu②液态SO 2 ③CH 3 COOH④NaHCO 3 ⑤H 2 O⑥熔融NaCl⑦BaSO 4 属于弱电解质的是______（填序号） （2）常温下，0.1mol?L -1 NaHCO 3 溶液的pH大于8，则溶液中Na + 、HCO 3 - 、CO 3 2- 、OH - 四种微粒的浓度由大到小的顺序为：______．NaHCO 3 水解的离子方程式． （3）常温下，将某一元酸HA和NaOH溶液等体积混合，两种溶液的浓度和混合后所得溶液的pH如表： 实验编号 HA物质的量浓度（mol?L -1 ） NaOH物质的量浓度（mol?L -1 ） 混合溶液 的pH a 0.1 0.1 pH=9 b c 0.2 pH=7 请回答： ①从a组情况分析，HA是强酸还是弱酸______． ②b组情况表明，c______0.2（选填“大于”、“小于”或“等于”）混合溶液中离子浓度 c（A - ）______c（Na + ）．（选填“大于”、“小于”或“等于”） ③a组实验所得混合溶液中由水电离出的c（OH - ）=______mol?L -1 ．
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