strong or weak

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Ethan Vuong 3G
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Joined: Fri Sep 29, 2017 7:07 am

strong or weak

Postby Ethan Vuong 3G » Thu Dec 07, 2017 3:18 pm

Hi, during the final, what are some easy tricks that we can use to determine whether the acid or base is strong or weak? Also, can someone explain why when ions get larger, it becomes more acidic?

Diego Zavala 2I
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Re: strong or weak

Postby Diego Zavala 2I » Thu Dec 07, 2017 4:08 pm

When ions become more acidic (F- vs Cl-), HCl is more acidic because Cl has a bigger radius and hence the H-Cl bond strength decreases.

Maeve Gallagher 1J
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Joined: Fri Sep 29, 2017 7:07 am

Re: strong or weak

Postby Maeve Gallagher 1J » Thu Dec 07, 2017 4:09 pm

To answer your second question, when ions get larger in an HX acid, the length of the bond between the hydrogen and the ion gets longer. Longer bonds are weaker and more easily broken, allowing more H+ ions to be broken off and released into the solution to create H3O+ ions. This gives a higher concentration of H3O+ ions, giving a smaller pH and thus a more acidic solution.

Diego Zavala 2I
Posts: 65
Joined: Fri Sep 29, 2017 7:07 am
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Re: strong or weak

Postby Diego Zavala 2I » Thu Dec 07, 2017 4:10 pm

As to tricks to distinguish strong versus weak acids/bases, I would suggest memorizing the strong acids and bases because they are only a few of them. Also, learn the trends that increase or decrease bond strength (i.e., number of Oxygen atoms, atomic radii, and electronegativity)


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