homework 6A.23

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homework 6A.23

Postby BAlvarado_1L » Thu Jan 23, 2020 9:16 pm

How are we supposed to find the concentrations of Ba2+, OH−, and H3O+ if we aren't given the Ka or pH?

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Re: homework 6A.23

Postby CynthiaLy4F » Thu Jan 23, 2020 9:44 pm

For this problem, since it gives you the number of grams of Ba(OH)2, you would convert that into moles and divide it by the given volume of the solution to get the concentration of [Ba2+]. For the concentration of [OH-], you would multiply the concentration of [Ba2+] by 2 because the are 2 moles of OH- for every one mole of Ba(OH)2. Once you find the concentration of [OH-], use Kw to find [H3O+].

Ariel Davydov 1C
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Re: homework 6A.23

Postby Ariel Davydov 1C » Fri Jan 24, 2020 10:22 am

Since Ba(OH)2 is a strong base, it will dissociate almost entirely. Thus, if given the mass of Ba(OH)2 in this particular problem, you can calculate its molarity, set up a balanced equation of Ba(OH)2 dissociating, and use the ratios to find the concentrations of Ba2+ and OH-. From here, you can calculate the Kb value and use Kw to find the Ka. You can also use the OH- concentration to find the pOH, pH, and H3O+ concentration. Hope this helps!

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