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Excess of dilute sodium hydroxide soluti...

Excess of dilute sodium hydroxide solution is gradually added with shaking to an aqueous solution of zinc sulphate. What would you observe?

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A white precipitate is formed first of Zn(OH)2 which dissolves to give a colourless solution due to formation of soluble sodium zincate.
` ZnSO_(4)+2NaOHtoNa_(2)+Zn(OH)_(2)downarrow`(white)
`Zn(OH)_(2)downarrow+2N 2NaOHtoNa_(2) ZnO_(2)+2H_(2)O`Sodium zincate(soluble)
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