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Postby CaminaB_1D » Sat Dec 08, 2018 11:00 pm

Can someone walk me through exercise 12.25?

Calculate the initial molarity of Ba(OH)2 and the molarities of Ba2 , OH , and H3O in an aqueous solution that contains 0.43 g of Ba(OH)2 in 0.100 L of solution.

Jonathan Omens 1K
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Joined: Fri Sep 28, 2018 12:15 am

Re: 12.25

Postby Jonathan Omens 1K » Sun Dec 09, 2018 12:10 am

First calculate the amount of moles of Ba(OH)2 using the molar mass. Then remember that it completely dissociates into that number of moles of Ba and twice the number of moles of OH. Divide by .1L to get the molarity of Ba and OH. Then calculate the pOH using the molarity of OH and subtract it from 14 to get the pH. 10 to the pH power gives you the concentration of H3O+.

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