Ions as Bases in CR

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Ions as Bases in CR

Postby Michelle_Nguyen_3F » Tue Nov 29, 2016 4:56 pm

In the Course Reader, on page 160, it says that a salt containing a base will raise solution pH. When it says solution, is it just referring to a solution of the salt and water? How exactly does the salt increase the concentration of OH-? Also, it says that salts that contain the conjugate base (anion) of a weak acid will raise the pH by removing protons from water and generating OH-. I am having trouble understanding what this mean. Could someone please explain it in a different way or provide an example? Thank you so much!

Andrew Nguyen 3G
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Joined: Wed Sep 21, 2016 2:59 pm

Re: Ions as Bases in CR

Postby Andrew Nguyen 3G » Tue Nov 29, 2016 6:44 pm

A salt with a base will raise pH.

Example: CH3COONa breaks up into CH3COO- and Na. Na does not affect pH. Adding in CH3COO- will automatically alter the equilibrium of the reaction: CH3COOH -> CH3COO- + H+ Because more base is added, the reaction favors the reactants and takes away H+ and CH3COO- to reach equilibrium, thus making a more basic solution that is higher in pH.

The solution includes everything. The salt, the water, the base, and the products of their reactions.

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