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"Salt with a base"

Posted: Sat Jul 27, 2019 5:29 pm
by Katherine Fitzgerald 1A
In lecture this week, we talked about "salts with a base" (e.g., that contain OH-). Are the salts themselves not considered to be bases? Is it erroneous to refer to the entire compound, including the salt, as a base? In Section J1A of the textbook, there is a note that says "sodium hydroxide is a base; however, from the Bronsted point of view, it simply provides the base OH-. Chemists commonly slip into using the Arrhenius definition." This sounds like it's saying that sodium hydroxide is not actually base. However, on the following page, it lists "Group 1 hydroxides" as strong bases, which seems to contradict that nuance they just point out.

Can anyone provide clarification?

Thanks!

Re: "Salt with a base"

Posted: Sat Jul 27, 2019 6:06 pm
by Chem_Mod
Sodium Hydroxide is a strong base. The Arrhenius definition (which is not a major focus of this class) describes a base as a substance that dissociates in water to form hydroxide ion (OH-).
"Salts with a base" just refers to salts which are formed by the reaction of a weak acid and a strong base giving the salt basic properties. This means that the dissociation of the salt in water will produce a basic solution. Salts can be acidic (formed by the reaction of strong acid and weak base) or basic (as mentioned above) or neutral (strong acid + strong base or weak acid + weak base).

Re: "Salt with a base"

Posted: Sun Jul 28, 2019 8:26 pm
by nicknavejas1B
Great information here! Thank you.