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The slow reaction dissolving silver must be : $$\ce{2Ag + H2O2 + 2CH3COOH -> 2CH3COOAg + 2 H2O}$$ The mixture has to be hot because the rection is extremely slow. Its rate is negligible at room temperature. Even at $60$°C, about $10$ minutes are required to dissolve nanoparticles of silver on the milligram scale. Silver acetate $\ce{CH3COOAg}$ is ...


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