When dissolved in water, hydrogen bromide (hbr) forms hydrobromic acid. determine the hydroxide ion concentration in a 4,500 ml solution containing 3.78 g hydrogen bromide; kw = 1.00 * 10¯14?

Question

Chemistry

Laci Boyd

28 November, 16:04

When dissolved in water, hydrogen bromide (hbr) forms hydrobromic acid. determine the hydroxide ion concentration in a 4,500 ml solution containing 3.78 g hydrogen bromide; kw = 1.00 * 10¯14?

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Alana Morton · Answer 1

No of moles of HBr = 3.78g / 80.9 = 0.0467moles

Molarity = Number of moles / volume. So we have 0.0467 / 4.5 = 0.0103M.

Kw = 1.0 x 10 - 14 = [H3O+] [OH-] and [OH-] = 1.0 x 10^ (-14) / [H3O+]

So [OH-] = 1.0 * 10^ (-14) / 1.03 * 10^ (-2) = 0.9703 * 10^ (-12) M