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先變渾濁,因為生成亞硫酸鈣(不溶),然後由於亞硫酸鈣太多,又繼續反應生成亞硫酸氫鈣(可溶),又變澄清. Ca(OH)2+SO2=CaSO3沉澱+H2O Ca(OH)2+SO2=Ca(HSO3)2
酸:HCl HNO3 堿:NaOH Ca(OH)2 剩下兩個CaCO3 AgCl是鹽
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