July 2021 0 33 Report
Доброго времени суток, подскажите пожалуйста, проверил уже не единожды, не могу найти. 2 из 6 реакций не идут, какие и почему?

1. Zn(OH)2 + Cacl2 = ZnCl2 + Ca(OH)2
2. Zn(OH)2 + H2SO4 = ZnSO4 + 2H2O
3. Zn(OH)2 +2KOH = K2[Zn(OH)4]

4. Na2CO3 + 2HCl= NaCl + CO2 + H2O
5. Na2CO3 + NaOH = 2NaOH + CO2 + H2O
6. Na2CO3 + CaCl2 = NaCl2 + CaCO3
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