Acids and Basis: Salts


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briannam_1F
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Joined: Wed Sep 18, 2019 12:18 am

Acids and Basis: Salts

Postby briannam_1F » Tue Mar 10, 2020 10:34 pm

How does one calculate the pH of a weak acid and its salt?

Minh Ngo 4G
Posts: 137
Joined: Thu Jul 25, 2019 12:17 am

Re: Acids and Basis: Salts

Postby Minh Ngo 4G » Tue Mar 10, 2020 10:41 pm

That's the ICE table problem!

Venus_Hagan 2L
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Joined: Fri Aug 02, 2019 12:16 am

Re: Acids and Basis: Salts

Postby Venus_Hagan 2L » Tue Mar 10, 2020 10:56 pm

most of the time when you are dealing with weak acids and bases, you will be using an ICE table

WesleyWu_1C
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Joined: Thu Jul 25, 2019 12:16 am

Re: Acids and Basis: Salts

Postby WesleyWu_1C » Wed Mar 11, 2020 12:31 am

You would have to use an ice table and find the concentration of H3O+ (sometimes you will have to used the quadratic equation to find it). Then you plug in the concentration of H3O+ to get the pH.

005384106
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Joined: Sat Aug 24, 2019 12:16 am

Re: Acids and Basis: Salts

Postby 005384106 » Wed Mar 11, 2020 5:41 pm

When using an ICE Table, can you ever have a starting value of products, or is it always 0?

William Chan 1D
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Joined: Sat Sep 14, 2019 12:15 am

Re: Acids and Basis: Salts

Postby William Chan 1D » Wed Mar 11, 2020 10:10 pm

You can use an ICE table to help you figure out the concentrations in terms of known concentrations and changes in concentrations (usually determined in terms of 'x'). Depending on the size of k (if k is larger), then you may have to use the quadratic formula to solve for x. If the change in concentration is small, it can be ignored.

Leonardo Le Merle 1D
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Joined: Wed Feb 27, 2019 12:16 am

Re: Acids and Basis: Salts

Postby Leonardo Le Merle 1D » Thu Mar 12, 2020 11:18 am

It's a good idea to memorize which bases and acids are strong so you can know exactly when to apply the above methods mentioned.

Tanmay Singhal 1H
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Re: Acids and Basis: Salts

Postby Tanmay Singhal 1H » Thu Mar 12, 2020 11:19 am

you have to use the ICE table

Myka G 1l
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Joined: Fri Aug 30, 2019 12:17 am

Re: Acids and Basis: Salts

Postby Myka G 1l » Thu Mar 12, 2020 11:21 am

005384106 wrote:When using an ICE Table, can you ever have a starting value of products, or is it always 0?


Sometimes you will have a starting value of products and you’ll have to add x to the value in the ice table, creating a more complex equation that is equal to k. Also don’t forget coefficients in the ice table!

Philip
Posts: 100
Joined: Sat Sep 07, 2019 12:16 am

Re: Acids and Basis: Salts

Postby Philip » Thu Mar 12, 2020 12:17 pm

Use an ice table and any available information like the pKa or pKb as well as any equilibrium constants would be needed to solve such a problem


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