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Write the balanced chemical equation for the laboratory preparation of hydrogen chloride gas.

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Laboratory preparation of hydrogen chloride gas can be done by heating NaCl with concentrated sulphuric acid :
`NaCl + H_2SO_4 overset("420 K or "200^@C)to underset(underset("hydrosulphate")("Sodium"))(NaHSO_4) + HCI (uarr)`
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