2. At a temperature T K, the concentration of OH- is
10-5.5, the value Kw would be 10% in absence of
acid/base. The value of x is
(1) -10
(2) -11
(3) -12
(4) -14
Answers
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Explanation:
Pure water is neutral having equal concentrations of hydrogen ion and hydroxide ion.
K
w
is a self-ionization constant which is obtained from a self-ionization reaction, as given below:
H
2
O+H
2
O⟺H
3
O
+
+OH
−
where [H
3
O
+
]=[OH
−
]=1×10
−6.5
K
w
=[H
3
O
+
][OH
−
]
Hence, K
w
=1×10
−6.5
×1×10
−6.5
=1×10
−13
.
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