Question

# What is the $$pH$$ of the resulting solution when equal volumes of $$0.1\ M\ NaOH$$ and $$0.01\ M\ HCl$$ are mixed?

A
7
B
1.04
C
12.65
D
2

Solution

## The correct option is C 12.65When equal volumes of 0.1 M NaOH and 0.01 M HCl are mixed, the hydroxide ion concentration is  $$\displaystyle \frac {0.1-0.01}{2}=0.045 \: M$$The pOH of the solution is $$\displaystyle pOH= -log \ [OH^-] = -log \ 0.045 = 1.35$$The pH of the solution is $$\displaystyle pH = 14-pOH = 14- 1.35 =12.65$$Chemistry

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