Charged vs Neutral for pH
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Charged vs Neutral for pH
For question 10 on Achieve Week 2 HW I'm confused about why the answer is not neutral. I thought that when pH<pKa the species is neutral not charged.
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Re: Charged vs Neutral for pH
When pH is less than pKa the charged bH+ would be greater in the solution, meaning the predominant species is charged. When the pH and pKa are equal, that is when the solution becomes neutral.
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Re: Charged vs Neutral for pH
Basically, we first have to look at whether we're given an weak acid --> conjugate base reaction or weak base --> conjugate acid reaction. In the case of #10, we're given a weak base --> conjugate acid. In these reactions, the thing that is charged is the product, or conjugate acid which is the protonated (BH+). So, if the pH is less than the pKA, we know there is more of the charged BH+ in the solution. Since this is not the case and the pH of the solution is higher than the pKA, we know we the predominant species is the deprotonated B, which is neutral.
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