You visited us 1 times! Enjoying our articles? Unlock Full Access!

Salt of Weak Acid and Strong Base

pKa of a weak...

Question

$p K_{a}$ of a weak acid is $5.76$ and $p K_{b}$ of a weak base is $5.25$ . What will be the $p H$ of the salt formed by the two?

7.255

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

7.005

No worries! We‘ve got your back. Try BYJU‘S free classes today!

10.225

No worries! We‘ve got your back. Try BYJU‘S free classes today!

4.255

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is A $7.255$
$P K_{a} = 5.76$ $P K_{b} = 5.25$

$P^{H} = 7 + \frac{1}{2} (P K_{a} - P K_{b})$

$= 7 + \frac{1}{2} (5.76 - 5.25)$

$= 7 + \frac{1}{2} (0.51)$

$= 7 + 0.255 = 7.255$

Suggest Corrections

Similar questions

A salt is formed from a weak acid and weak base. If $p K_{b}$ > $p K_{a}$ , then the pH of that salt solution is

p H

A B

p K_{a}

H A

4

p K_{b}

p K_{a}

H A

4.80

p K_{b}

B O H

4.78

B A

{p K}_{a}

{p K}_{b}

Join BYJU'S Learning Program