1)
Al + HCl = AlCl₃ + H₂
Al = Al³⁺ + 3 e⁻ | 2
2 H⁺ + 2 e⁻ = H₂ | 3
-------------------------------------
2 Al + 6 H⁺ = 2 Al³⁺ + 3 H₂
<span>2 Al + 6 HCl = 2 AlCl₃ + 3 H₂
</span>
<span>2)
Al + NaOH(конц.) + H</span>₂O(гор.) = Na[Al(OH)₄] + H₂
Al + 4 OH⁻ = [Al(OH)₄]⁻ + 3 e⁻ | 2
2H₂O + 2e⁻ = H₂ + 2OH⁻ | 3
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2 Al + 8 OH⁻ + 6 H₂O = 2 [Al(OH)₄]⁻ + 3 H₂ + 6 OH⁻
2 Al + 2 OH⁻ + 6 H₂O = 2 [Al(OH)₄]⁻ + 3 H<span>₂
</span>2 Al + 2 NaOH⁻ + 6 H₂O = 2 Na[Al(OH)₄]⁻ + 3 H<span>₂
</span>
<span> 5H₂SО₄+8Na= 4Na₂SО₄+4H₂O+H₂S</span>
Привет,
3 KOH + Cr(NO3)3 = Cr(OH)3 + 3 KNO3
2Cu+O2=2CuO
CuO+2HCl=CuCl2+H2O
CuCl2+NaOH=Cu(OH)2+NaCl
Cu(OH)2=CuO+H2O