NaCl →Hel→ CuCl₂ → Cu(OH) 2 CuO → Cu(NO3)₂ NaCl + H₂SO4 → HCI +Na2SO4 HCl + Cu(OH)2 → CuCl2 + H₂O CuCl2+ NaOH → Cu(OH)↓2+NaCl Cu(OH)2 → Сио +H20 CuO+HNO3 → Cu(NO3)2 + H₂O розставте коефіцієнти​
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