A. KNO 3 , PbCl 2 , Ca(HCO 3 ) 2 , Na 2 S, NH 4 Cl. B. KNO 3 , HClO 4 , Ca 3 (PO 4 ) 2 , Na 2 CO 3 , CuSO 4 .
C. KHSO 4 , HClO 4 , Na 2 S, CH 3 COONa, NH 4 Cl D. KOH, HClO 4 , NaHSO 4 , Ca(HCO 3 ) 2 , NH 3 .
Câu 7: Khi pha loãng dung d ch CH ị 3 COOH
1M thà[r]