Question

What is the ph of a 0.309 m solution of hypobromous acid (hbro)? Ka = 2.8 10-9?

Answer 1

Answer

For most weak acid problems, [H3O+] = sqrt (Ka x [HA]o)

[H3O+] = sqrt ((2.8 x 10^-9)(0.216)) = 2.5 x 10^-5 M

pH = -log [H3O+] = -log (2.5 x 10^-5) = 4.61