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pH of the resulting mixture formed When ...

pH of the resulting mixture formed When 200mL of aqueous solution of HCl (pH = 2.0)is mixed with 300mL of an aqueous solution of NaOH(pH = 12.0) is

A

10

B

2.7

C

`4.0`

D

`11.3`

Text Solution

Verified by Experts

The correct Answer is:
D
Concentration of HCl solution `=1 times 10^-2` br> `therefore` Millimoles of HCL solution `=200 times 1 times 10^-2`
=2
Similarly , millimoles of NaOH solution
`=300 times 1 times 10^-2`
=3
Concentration of the resultant solution
`=(3-2)/(300+200)`
`=1/500= 0.2 times 10^-2`
`because [OH^-]=0.2 times 10^-2`
`pOH=-log[OH^-]=-log[2 times 10^-3]=+2.70`
`therefore`pH of the resulting mixture =14-2.70= 11.3
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