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In acidic medium , particles of the sol ...

In acidic medium , particles of the sol formed by `SnO_(2)` are positively charged. But in alkaline medium, particles of the sol carry a negative charge-Explain.

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`SnO_(2)` is an amphoteric oxide. So, it reacts with both acid and alkali. In acidic medium, the reaction of `SnO_(2)` with the acid yields `Sn^(4+)` ions: `SnO_(2) + 4HCl to SnCl_(4) + 2H_(2)O`
`Sn^(4+)` ions are adsorbed by sol particles and become positively charged. But, in the reaction of `SnO_(2)` with alkali, `SnO_(3)^(2-)` ions are formed. `SnO_(3)^(2-)` ions are adsorbed by sol particles and become negatively charged.
`SnO_(2) + 2NaOH to Na_(2)SnO_(3) + H_(2)O`
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