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  • Find the resultant pH when 100 mL of an aqueous solution of HCl having pH = 3 is mixed with 200 mL of an aqueous solution of NaOH having pH = 12Option: 1</strong

Find the resultant pH when 100 mL of an aqueous solution of HCl having pH = 3 is mixed with 200 mL of an aqueous solution of NaOH having pH = 12

Option: 1

11.8


Option: 2

9.3


Option: 3

10.5


Option: 4

11.5


Answers (1)

best_answer

According to question,

 

{\mathrm{HCl}+\mathrm{NaOH} \longrightarrow \mathrm{NaCl}+\mathrm{H}_{2} \mathrm{O}}

Meq. before the reaction

0.1                    2                         -            -

Meq. after the reaction

0                     1.9                       0.1         0.1

 

\left[\mathrm{OH}^{-}\right]=\frac{1.9}{300}=6.3 \times 10^{-3}

\mathrm{pOH = -\log[OH^{-}] = -\log(6.3\times 10^{-3}) = 2.2}

pH = 14-2.2 = 11.8

Posted by

Ritika Kankaria

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