Home
Class 12
CHEMISTRY
What should be the concentration of NaA....

What should be the concentration of NaA. If its 50 mL solution is added to 50 mL of 0.2 M HA to have a pH = 4. `K_a " for HA "= 1.0 xx 10^(-5)`.

Text Solution

Verified by Experts

Let a be the concentration of NaA. After mixing `M_(NaA)=(a xx 50)/(100)=a/2 and M_(HA)=(0.2 xx 50)/(100)=0.1`
Now, `pH =-log K_(a)+log (["Salt"])/(["Acid"])`
`4=-log (1.0 xx 10^(-5))+log (a//2)/(0.1)`
`therefore a=0.2M`
Promotional Banner

Topper's Solved these Questions

  • IONIC EQUILIBRUIM

    MOTION|Exercise Exercise -1|58 Videos

  • IONIC EQUILIBRUIM

    MOTION|Exercise Exercise -2 (Level -1)|37 Videos

  • HYDROCARBON

    MOTION|Exercise Exercise - 4 (Level-II)|15 Videos

  • ISOMERISM

    MOTION|Exercise Exercise 4|26 Videos

Similar Questions

Explore conceptually related problems

What should be the concentration of NaA, if its 50 mL solution of 0.10MNH_(3) and 0.10MNH_(4)CI without changing the pH by more than 1.0 unit ? Assume no change in volume. (K_(a) for HA= 1.0xx10^(-5))

How much volume of 0.1M Hac should be added to 50mL of 0.2M NaAc solution to have a pH 4.91 ?

Calculate the pH after 50.0mL of this solution is treated with 25.0mL of 0.1M HCI K_(b) for NH_(3) = 1.77 xx 10^(-5) (pK_(b) ~~ 4.76) .

What is the concentration of H^(+) in a solution that is prepared by mixing 50.0 mL of 0.50 M HCl with 200.0 mL of 0.25 M HCl ? Fill your Answer of the multiplying it with 10.

What will be the pH of a solution formed by mixing 50 mL of 0.5 M HCl solution and 150 mL of 0.5 M NaOH solution and 300 mL H_(2) O ?

What will be the H^(+) concentration in a solution prepared by mixing 50.0 ml of 0.20 m NaCl, 25 ml of 0.10 M NaOH and 25.0 ml of 0.30 M HCl?

If 50ml of 0.2 M KOH is added to 40 ml of 0.05 M HCOOH , the pH of the resulting solution is ( K_(a)=1.8xx10^(-4) )