Calculate the ph of the solution made by adding 0.50 mol of hobr and 0.30 mol of kobr to 1.00 l of water. the value of ka for hobr is 2.0×10−9.

pH = 8.48

Explanation:

HOBr dissociates in water as follows:

With a ka expressed by:

We rearrange and solve for [H⁺]:

Because the volume is 1 L, the moles added of HOBr and KOBr (OBr⁻) are also the molar concentration:

Finally we calculate the pH:

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