in the laboratory preparation of HClacid from Nacl and conc.hydrochloric acid the residual salt formed at temperature above 200 celsius forms a hard crust and sticks to the glass. give reason.

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Solution

The reaction proceeds as,

H₂SO₄ + 2 NaCl $\overset{> 200^{0} C}{\to}$ 2 HCl + Na₂SO₄

Formation of hard crust of Na₂SO₄which sticks to glass

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in the laboratory preparation of HClacid from Nacl and conc.hydrochloric acid the residual salt formed at temperature above 200 celsius forms a hard crust and sticks to the glass. give reason.

The reaction proceeds as, H2SO4 + 2 NaCl →> 2000C 2 HCl + Na2SO4 Formation of hard crust of Na2SO4 which sticks to glass

The reaction proceeds as,

H₂SO₄ + 2 NaCl $\overset{> 200^{0} C}{\to}$ 2 HCl + Na₂SO₄

Formation of hard crust of Na₂SO₄which sticks to glass