Make up the reaction equation: 1. CuSO4 – Cu (OH) 2 – CuO 2. FeCl3 – Fe (OH) 3 – Fe2 (SO4) 3 3. ZnCl2 – Zn (OH) 2 – ZnCl2
1. The reaction of exchange of sulfate with alkali.
CuSO4 + 2KOH = Cu (OH) 2 + K2SO4.
Decomposition of hydroxide at a temperature of 40-80 ° C.
Cu (OH) 2 = CuO + H2O.
2. Reaction of salt with alkali.
FeCl3 + 3NaOH = Fe (OH) 3 + 3H2SO4.
Reaction of hydroxide with alkali.
2Fe (OH) 3 + 3H2SO4 = Fe2 (SO4) 3 + 6H2O.
3. Zinc chloride and sodium hydroxide enter into an exchange reaction.
ZnCl2 + 2NaOH = Zn (OH) 2 + 2NaCl.
Reaction with hydrochloric acid.
Zn (OH) 2 + 2HCl = ZnCl2 + 2H2O.
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