Salt Solutions

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Janet Nguy 2C
Posts: 115
Joined: Sat Aug 24, 2019 12:17 am

Salt Solutions

Postby Janet Nguy 2C » Mon Jan 20, 2020 3:36 pm

First of all, what exactly is a salt and how can you identify it within a reaction?

Secondly, how is calculating the pH of a salt solution going to be different than calculating the pH of acid/base solutions?

GFolk_1D
Posts: 101
Joined: Fri Aug 09, 2019 12:15 am

Re: Salt Solutions

Postby GFolk_1D » Mon Jan 20, 2020 4:36 pm

Hi! I found this video to be very useful on this topic. https://www.khanacademy.org/science/che ... -solutions

christabellej 1F
Posts: 109
Joined: Sat Aug 17, 2019 12:17 am

Re: Salt Solutions

Postby christabellej 1F » Mon Jan 20, 2020 7:27 pm

A salt is composed of a positively and negatively charged ion. It shouldn't be different from calculating other acid/base pH. Usually, one part of the salt will influence the pH - for example, in NaC2H3CO2, C2H3CO2 is negatively charged and will make for a basic solution. You would just do the ICE table with C2H3CO2- in water, just like any other acid base problem.

Emily Chirila 2E
Posts: 112
Joined: Sat Jul 20, 2019 12:16 am

Re: Salt Solutions

Postby Emily Chirila 2E » Mon Jan 20, 2020 7:37 pm

First you need to be able to recognize which parts of a salt don't affect pH (group 1&2 elements, like Na+). Once you recognize what part of the salt WILL affect the pH, you write the reaction for that part of the salt reacting with water to form it's conjugate acid/base and either H3O+ or OH-, depending if the reactive part of the salt is an acid (will form H3O+) or a base (will form OH-). From there you can use an ICE table to calculate pH or whatever the problem is asking you for.


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