Verified Solution • 2025–26 Session
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QNEET-2013-Ch-1569: NEET 2013 Chemistry - Class 11 NEET-2013-Ch-1569 Solution: At \(100^ C\) the \(K_w\) of water is 55 times its value at…
At the of water is 55 times its value at . What will be the pH of neutral solution? (log 55 = 1.74) 7.87 5.13 6.13 7.00
Multiple Choice Options
- A 7.87
- B 5.13
- C 6.13
- D 7
Step-by-Step Verified Solution
K w at 25 o C = 1 _ 10 �14
At 25�C
K w = [H + ] [OH � ] = 10 �14
At 100�C (given)
K w = [H + ] [OH � ] = 55 _ 10 �14
for a neutral solution
[H + ] = [OH � ]
[H + ] 2 = 55 _ 10 �14
or [H + ] = (55 _ 10�14) 1/2
pH = � log [H + ]
On taking log on both side
� log [H + ] = �log (55 _ 10 �14 ) 1/2
_ pH = 1 2 -
log55 - 14log10
_ pH = 6.13