Which of the following NaOH solutions have the highest pH value a) 1M b) 2M c) 0.5M d) 0.1
Answer
b) 2M
Explanation
NaOH is a strong base and completely dissociate ,so
[NaOH] = [OH-]
pOH = -log[OH-]
pH = 14 - pOH
as OH- concentration increases pH increases
a) pOH = - log(1M)
pOH = 0
pH = 14 - 0 = 14
b) pOH = - log(2M)
pOH = - 0.3010
pH = 14 - (-0.3010) = 14.30
c) pOH = -log(0.5M)
pOH = 0.30
pH = 14 - 0.30 = 13.7
d) pOH = - log( 0.1M)
pOH = 1
pH = 14 - 1 = 13
Therefore ,
The answer is b) 2M
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