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The K(a) for formic acid and acetic acid...

The `K_(a)` for formic acid and acetic acid are `2xx10^(-4)` and `2xx10^(-5)` respectively. Calculate the relative strength of acids with same molar concentration

A

`sqrt10`

B

`sqrt7`

C

`sqrt8`

D

`sqrt5`

Text Solution

Verified by Experts

The correct Answer is:
A
Relative strength of weak acids `= sqrt(((K_(a_(1)))/(K_(a_(2)))xx(C_(1))/(C_(2))))`
`:.` Relative strength `=sqrt(((K_(a_(1)))/(K_(a_(2)))))` (`:' C_(1)=C_(2))`
`=sqrt(((2xx10^(-4))/(2xx10^(-5))))`
Relative strength for `HCOOH` to `CH_(3)COOH=sqrt(10):1`
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A2Z-IONIC EQUILIBIUM-Section D - Chapter End Test
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  9. The hydrolysis constant for ZnCl(2) will be where K(b) is effective ...

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  10. In which case pH will not change on dilution

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  12. 1 M benzoic acid (pKa=4.20) and 1 M C6H5COONa solutions are given sepa...

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  13. The pH of an aqueous solution of 0.1 M solution of a weak monoprotic a...

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  14. pH of a 10^(-10) M NaOH is nearest to

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  15. The dissocication constant of a weak acid is 1.0xx10^(-5), the equilib...

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  16. The pH of 0.1 M solution of the following salts increases in the order

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  17. In the equilibrium A^(-)+H(2)OhArrHA+OH^(-)(K(a)=1.0xx10^(-5)). The de...

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  18. The sulphide ion concentration [S^(2-)] in saturated H(2)S solution is...

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  19. The K(sp) of CuS, Ag(2)S and HgS are 10^(-31), 10^(-44) and 10^(-54) r...

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  20. For a weak acid HA with dissociation constant 10^(-9), pOH of its 0.1 ...

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