(a) The following questions are related to the laboratory preparation of hydrogen
chloride gas.
(I)Write the balanced chemical reaction for the laboratory preparation of the above
mentioned gas.
(ii) Name the method used for collecting the gas.
(iii) State a method to prove that gas jar used for collection of HCl gas is filled with
hydrogen chloride
(iv) Draw the electron dot structure for the formation of ammonium ion.
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Answers
Q11) In the laboratory preparation of carbon dioxide by action of a dilute acid on a metallic carbonate give - (a) A balanced equation for the preparation (b) A reason for (i) use of a washer bottle containing concentrated H_2SO_4H
2
SO
4
in the preparation (ii)
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Answer:
1) 420K
NaCl + H2SO4 → NaHSO4 + HCl
3) The chemical test for hydrogen is that it burns with a pop sound. Therefore before collecting the gas it should be tested with a burning splint, if the burning produces a pop sound, then you would know that what you are collecting is actually hydrogen gas.
2) Hydrogen chloride gas is collected by the downward delivery (upward displacement of air) as it is 1.28 times heavier than air. It is not collected over water, since it is highly soluble in water.
4) NH4+ is known as an ammonium ion, but NH4 would not make sense as it is not balanced. The lewis structure would be the Nitrogen atom in the center, with 4 hydrogens surrounding it. There would be no lone pairs, the molecule would also be nonpolar.