Chemistry
(a) Name an element which reacts with hydrogen to form compound which is strongly acidic in water.
(b) Explain why dilute hydrochloric acid cannot be concentrated by boiling beyond 22.2%
Hydrogen Chloride
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Answer
(a) Chlorine, It forms HCl which is strongly acidic.
H2 + Cl2 ⟶ 2HCl
(b) Hydrochloric acid forms a constant boiling mixture at 110°C, 22.2% by weight. On boiling further, the mixture evolves out the vapours of both acid and water in the same proportion as in the liquid.
Hence, dilute HCl cannot be concentrated beyond 22.2% by boiling.
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Related Questions
The given set up in the figure is for the preparation of an acid
(a) Name the acid prepared by this method.
(b) Name the reactants used.
(c) Why an empty flask is used?
(d) What is the drying agent used? Why is this drying agent chosen
(e) What is the role of inverted funnel in the arrangement?
(a) (i) Name the experiment illustrated below.
(ii) State the colour of the water that has entered the round-bottomed flask.
(b) What property of hydrogen chloride is demonstrated when it is collected by downward delivery (upward displacement)?
How will you prove that Hydrochloric acid contains
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(ii) chlorine.
Write equations for the reactions.
Name :
(a) a black metallic oxide which reacts with hydrochloric acid to give a coloured solution.
(b) two colourless gases, which when mixed produce a white solid
(c) two gases which chemically combine to form a liquid.
(d) a chloride which is soluble in excess of ammonium hydroxide.
(e) the chemical in which gold can be dissolved.
(f) the experiment which demonstrates that hydrogen chloride is soluble in water.
(g) the gas produced when chlorine water is exposed to sunlight.