An acid – base indicator has . The acid form of the indicator is red and the basic form is blue. The change in required to change the indicator from 75% red to 75% blue is . The value of ‘y’ is
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Answer:
pH=pK
a
+log
[HIn]
[In
−
]
Initial concentration of [HIn]=75%
Final concentration of [HIn]=25%
Initial concentration of [In
−
]=25%
Final concentration of [In
−
]=75%
∴pH
1
=−log(3×10
−5
)+log[
25
75
]
⇒pH
1
=5⇒[H
1
]
+
=10
−5
M
∴pH
2
=−log(3×10
−5
+log(
75
25
)
⇒pH
2
=−4.045⇒[H
2
+
]=8.91×10
−5
M
∴[H
2
+
]−[H
1
+
]=7.91×10
−5
M
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