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Question

# Which one of the following solutions will have the highest pH value?

A
0.01M NaOH
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B
0.02M CH3COONa
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C
0.01M NaHCO3
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D
0.01M H2SO4
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Solution

## The correct option is A 0.01M NaOH(A) 0.01M NaOH∴pH=14−pOH=14−(−log10−2)=12(B) 0.02M CH3COONaThis is a salt of weak acid and strong base.pH=7+1/2pKa+1/2logC =7+1/2×4.74+1/2log(10−2×2)=8.5(C) 0.01M NaHCO3pH=12pK1+12pK2=12(−log4×10−7−log6×10−11) =8.3(D) 0.01M H2SO4 H2SO4⇌2H++SO2−4∴[H+]=2×0.01=0.02M∴pH=−log(0.02)=1.69Therefore, 0.01M NaOH solution has highest pH .

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