Home
Class 12
CHEMISTRY
At 25^(@)C find pH of resultant solution...

At `25^(@)C` find pH of resultant solution prepared by mixing 50 ml, 0.2 M kA(aq) and 50 ml, 0.2M kB(aq) solution : (given = `K_(a)(HA)=5xx10^(-9), K_(a)(HB)=1.25xx10^(-9)`)

A

3

B

2.5

C

11

D

6

Text Solution

Verified by Experts

The correct Answer is:
D
`"pH of "(NaHCO_(3))=(1)/(2)[pKa_(1)+pKa_(2)]`
`(1)/(2)[pKa_(1)+pKa_(2)]=9`
`pKa_(1)+underset(LR)(pKa_(2))=18`
`H_(2)CO_(3)+NaOH rarr NaHCO_(3)`
`{:(44,40,,-),(4,0,,40):}`
Buffer `rarr pH = pKa_(1)+log.(40)/(4)`
`pH=pKa_(1)+log.(40)/(4)`
`pH=pKa_(1)+log10`
`7.6 = pKa_(1)+1`
`pk_(a_(1))=6.6`
`18=6.6 + pk_(a_(2))`
`pk_(a_(2))=11.4`
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • REVIEW TEST

    VIBRANT|Exercise PART - II : CHEMISTRY|19 Videos

  • REVIEW TEST

    VIBRANT|Exercise PART - III : CHEMISTRY|20 Videos

  • TEST PAPERS

    VIBRANT|Exercise PART - III : CHEMISTRY|61 Videos

Similar Questions

Explore conceptually related problems

Calculate the pH of a solution obtained by mixing 50 ml of 0.2 M HCl with 49.9 ml of 0.2 M NaOH solution.

Determine the pH value of a solution obtained by mixing 25 mL of 0.2 M HCI and 50 mL of 0.25 N NaOH solutions.

Knowledge Check

  • The pH of a solution obtained by mixing 50 ml of 0.4 M HCl with 50 ml of 0.2 M NaOH is

    A
    `-log 2`
    B
    `-log 2 xx 10^(-1)`
    C
    `7.0`
    D
    `2.0`

  • the pH of a solution prepared by mixing 2M, 100 mL HCl and M, 200 mL NaOH at 25^(@)C is

    A
    8
    B
    7
    C
    4
    D
    5

  • The pH of a solution obtained by mixing 50 mL of 0.2 M HCl with 50 mL of 0.20 M CH_(3) C O OH is

    A
    `0.30`
    B
    `0.70`
    C
    `1.00`
    D
    `2.00`

    • Similar Questions

    Explore conceptually related problems

    Calculate the pH of a solution obtained by mixing 50ml of 0.2 M HCl with 49.9 mL of 0.2 m NaOH solution.

    Calcualte the pH of solution when 100 mL, 0.1 M CH_(3)COOH and 100 mL, 0.1 M HCOOH are mixed together. ("Given : "K_(a)(CH_(3)COOH)=2xx10^(-5)), K_(a)(HCOOH)=6xx10^(-5)

    Calculate the pH of solution prepared by mixing 50.0 mL of 0.200 M HC_2H_3O_2 and 50.0 mL of 0.100 M NaOH. [Ka(CH_3COOH)=1.8 xx 10^(-5)]

    Find the pH of solution prepared by mixing 25 ml of a 0.5 M solution of HCl, 10 ml of a 0.5 M solution of NaOH and 15 ml of water

    The pH of buffer solution prepared by mixing 50 mL of 0.2 M CH_(3)COCOOH and 25 mL of CH_(3)COONa ? P^(Ka) of CH_(3)COOH = 4.8

    Home
    Profile