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Chemistry molarity acid-base

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Calculate the molarity of Ba2+ in an aqueous solution that contains 1.5 g of Ba(OH)2 in 0.85 L of solution. Answer in units of mol/L.

pt 2- What is the molarity of H3O +? Answer in units of mol/L. 

Feb 28th, 2015

First, convert to mols

mols Ba(OH)2 = 1.5 g / 171.3438 g/mol = 8.754E-3 mols

All of the Ba(OH)2 will dissolve, giving Ba2+ and OH-

The molarity of Ba2+ = 8.754E-3 mols / 0.85 L 

[Ba2+] = 1.0E-2 mols/L (with sigfigs in mind)

The molarity of [OH-] will be twice the molarity of [Ba2+]

[OH-] = 2.0598E-2 mols/L

kw = [OH-] * [H3O+]

solving for [H3O+]...

[H3O+] = kw / [OH-]

[H3O+] = 1.00E-14 / (2.0598E-2) 

= 4.9E-13 mols/L (with sigfigs in mind)


Feb 28th, 2015

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