Sapling HW Q5

Moderators: Chem_Mod, Chem_Admin

Evonne Hsu 1J
Posts: 106
Joined: Wed Sep 30, 2020 9:35 pm

Sapling HW Q5

Postby Evonne Hsu 1J » Sun Jan 17, 2021 2:44 pm

Can someone please explain the step-by-step process of this question? Thank you!
Screen Shot 2021-01-18 at 6.43.23 AM.png

Stuti Pradhan 2J
Posts: 159
Joined: Wed Sep 30, 2020 9:32 pm
Been upvoted: 5 times

Re: Sapling HW Q5

Postby Stuti Pradhan 2J » Sun Jan 17, 2021 5:00 pm

For this problem, I recommend converting the pH to a pOH since you are working with a base. Once you have a pOH, you can use it to figure out the OH- concentration. Since for every one mole of OH- there is also one mole of BH+, you know can figure out the numerator of the equation for Kb. Set the Kb value equal to [BH+][OH-]/[B], and plug in the values you just found to find the concentration of the base.

Then to find percent protonation, divide the concentration of BH+ by the formal concentration of B (which is the sum of the concentrations of BH+ and B), and multiply by 100.

Hope this helps!

Return to “Equilibrium Constants & Calculating Concentrations”

Who is online

Users browsing this forum: No registered users and 3 guests