KF v KBr

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Joanne Kang 3I
Posts: 50
Joined: Thu Jul 25, 2019 12:17 am

KF v KBr

Postby Joanne Kang 3I » Wed Dec 04, 2019 7:25 pm

Why is KF basic while KBr neutral even though both anions are in the same group?

Andrew Liang 1I
Posts: 105
Joined: Fri Aug 30, 2019 12:18 am

Re: KF v KBr

Postby Andrew Liang 1I » Wed Dec 04, 2019 7:46 pm

KF is a salt that comes from strong base KOH and weak acid KF. When added with water, KF becomes K+ and F- and F- is not stable as an ion because of its strong electronegativity. The F- will attract the H+ from water forming OH-. On the other hand, KBr comes from strong base KOH and strong acid HBr. When added with water the salt is completely dissociated into K+ and Br- and both ions are stable and will not affect the pH.

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