Write the reaction equation 1) CrO3 H2CrO4 – Na2CrO4 (sodium chromate) 2) Mn2O7 – HMnO4 – KMnO4 (potassium permanganate – potassium permanganate)
To solve the chain of transformations, we indicate the names of the substances:
1) Chromium oxide – chromic acid – sodium chromate.
CrO3 + H2O = H2CrO4 – compounds, chromic acid obtained;
Н2CrO4 + 2NaOH = Na2CrO4 + H2O – ion exchange, sodium chromate was formed.
2) Manganese oxide – manganese acid – potassium permanganate.
Mn2O7 + H2O = 2HMnO4 – compounds, manganese acid was formed;
HMnO4 + KOH = KMnO4 + H2O – neutralization, potassium permanganate obtained.
Conclusion: the solution confirms the connection of acidic oxides, acids. The end product-KMnO4 in everyday life is called “potassium permanganate”, which was used for disinfection, in chemistry it is used as an oxidizing agent.
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