A 1.00 liter solution contains 0.58 M ammonia and 0.45 M ammonium chloride . If
ID: 547552 • Letter: A
Question
A 1.00 liter solution contains 0.58 M ammonia and 0.45 M ammonium chloride.
If 0.22 moles of perchloric acid are added to this system,
indicate whether the following statements are true or false.
(Assume that the volume does not change upon the addition of perchloric acid.)
_______TrueFalse A. The number of moles of NH3 will increase.
_______TrueFalse B. The number of moles of NH4+ will decrease.
_______TrueFalse C. The equilibrium concentration of H3O+ will remain the same.
_______TrueFalse D. The pH will decrease.
_______TrueFalse E. The ratio of [NH3] / [NH4+] will decrease.
Explanation / Answer
This is the concept of Lechatlier Principle.
NH3 (aq) + HCl (aq) <----------> NH4Cl (aq)
a) For the above reaction, if the number of moles of HClO4 is added the equilibrium shifts towards the right. So the given statement is False.
b) The second statement also a false statement as the number of moles of NH 4+ increase by adding perchloric acid.
c) The equilibrium concentration of H3O+ is not same because system tries to establish the equilibrium again. So the statement is false.
d) As H+ consumption increases the pH change will also be increased. So the statement is False.
e) This statement is True as the concentration of NH4+ increases.
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