MEDIUMMCQ SINGLENEET ChemistryPhysical ChemistryIonic equilibriumPrevious Year Questions
At 100C the Kw of water is 55 times its value at 25C. What will be the pH of neutral solution? (log 55 = 1.74) (NEET 2013)
A.7.00
B.7.87
C.5.13✓ Correct
D.6.13
Explanation
We know that, at 25C, Kw = 1x1014 At 100C, Kw = 55 x 1016 - w K H OH IONIC EQUILIBRIUM 57 2 14 14 14 H H 55 10 pH log H pH log 55 10 1 1 log 55 10 log55 14log10 2 2 1 1 1.74 14 12.26 6.13 2 2 w K >> x x x 33. Which of the following salts will give highest pH in water? (AIPMT 2014) (a) KCl (b) NaCl (c) 2 3 Na CO (d) 4 CuSO The reaction with water of given compounds is as follows: 2 3 2 2 3 2 2 4 2 2 4 2 Na CO + H NaOH +H CO NaCl+H O NaOH +HCl KCl+H O KO
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