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What is the type of salt formed when the...

What is the type of salt formed when the reactants are heated at a suitable temperature for the preparation of Nitric acid ?

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Sodium sulphate is formed if the reactants (sulphuric acid and sodium nitrate) for the preparation of nitric acid are heated above `200^@C`. The sodium sulphate formed deposits as a hard crust and is difficult to remove
`NaNO_3 + NaHSO_4 overset(200^@C)to Na_2SO_4 + HNO_3`
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