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HCl -- question number 8

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Asked by bpradeksha | 12th Feb, 2019, 07:15: PM

Expert Answer:

 

Q. With respect to the laboratory preparation of hydrochloric acid answer the following questions.[5M]
 
 (i)Name the substance A and give its use.
 (ii)Which method is used to collect hydrogen chloride gas?
 (iii)Give the reaction which places in the round bottom flask.
 (iv)Why is the temperature of the reaction mixture kept below 200 °C?
 (v)How can hydrochloric acid be prepared from substance B?
 
 
Ans:
 
(i) A - Concentrated H2SO4
 
(ii) Upward displacement of air as HCl gas is heavier than air

(iii)    NaCl subscript left parenthesis straight s right parenthesis end subscript space plus space space straight H subscript 2 SO subscript 4 left parenthesis conc right parenthesis end subscript space space rightwards arrow from 200 degree straight C to Below of NaHSO subscript 4 left parenthesis straight s right parenthesis end subscript space plus space HCl subscript left parenthesis straight g right parenthesis end subscript
(iv)because (a) on heating lots of fuel is wasted (b) a sticky mass of sodium sulphate is formed which destroys the glass apparatus.

(v)Substance B which is HCl gas on dissolving in water produces strong, monobasic hydrochloric acid.
 
                                   HCl subscript left parenthesis straight g right parenthesis end subscript space plus space space straight H subscript 2 straight O subscript left parenthesis straight l right parenthesis end subscript space space rightwards arrow with blank on top space straight H subscript 3 straight O to the power of plus subscript left parenthesis aq right parenthesis end subscript plus space Cl to the power of minus

 

Answered by Ramandeep | 13th Feb, 2019, 11:05: AM