salts of weak acids and bases

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Saachi_Kotia_4E
Posts: 68
Joined: Fri Sep 28, 2018 12:23 am

salts of weak acids and bases

Postby Saachi_Kotia_4E » Sat Dec 08, 2018 3:49 pm

can someone explain why salts of weak bases produce acidic solutions and salts of weak acids produce basic solutions?

605168557
Posts: 65
Joined: Fri Sep 28, 2018 12:18 am

Re: salts of weak acids and bases

Postby 605168557 » Sat Dec 08, 2018 5:58 pm

Basic salts form from the neutralization of a strong base and a weak acid. For example, the reaction of sodium hydroxide (strong base) with acetic acid (weak acid) will yield water and sodium acetate which is a basic salt. Similarly, acid salts form from the neutralization reaction between a strong acid and a weak base. For example, hydrochloric acid (strong acid) reacting with ammonia (weak base) produces water and ammonium chloride, which is an acid salt.

Reminder: If Ka(cation)=Kb(anion) the solution of the salt will be neutral.

Porus_Karwa_2E
Posts: 72
Joined: Fri Sep 28, 2018 12:24 am

Re: salts of weak acids and bases

Postby Porus_Karwa_2E » Sat Dec 08, 2018 6:01 pm

Will this be on the chem14A final?

paytonm1H
Posts: 74
Joined: Fri Sep 28, 2018 12:18 am

Re: salts of weak acids and bases

Postby paytonm1H » Sat Dec 08, 2018 6:07 pm

Since salts as acids and bases are weak, there probably won't be much on the final asking about them (Lavelle said that we will only be tested on strong acids and bases, weak will be covered more in 14B). Conceptually, I believe we should know that salts containing acids will lower the solution pH and salts containing a base will raise the solution's pH.
Hope this helped!

Leela_Mohan3L
Posts: 44
Joined: Fri Sep 28, 2018 12:26 am

Re: salts of weak acids and bases

Postby Leela_Mohan3L » Sat Dec 08, 2018 6:12 pm

A salt of a weak acid contains a strong conjugate base as its anion. This strong conjugate base is good at pulling a proton off H2O and thus OH- ions will be produced, making the solution basic. A salt of a weak base contains a strong conjugate acid, which is good at giving protons to H2O. This will produce H3O+, thus making the solution acidic.


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