## Calculating pH of a weak acid and its salt

AlyssaBei_1F
Posts: 99
Joined: Fri Sep 28, 2018 12:17 am

### Calculating pH of a weak acid and its salt

For calculating the pH of a weak acid and its salt, is an extra number given, but the steps to complete the problem are the same?

almaochoa2D
Posts: 67
Joined: Fri Sep 28, 2018 12:23 am

### Re: Calculating pH of a weak acid and its salt

yes, there is just an initial concentration for the salt as well as the weak acid. But the steps are the same.

Neil Hsu 2A
Posts: 61
Joined: Fri Sep 28, 2018 12:16 am

### Re: Calculating pH of a weak acid and its salt

Yes, the steps are exactly the same as calculating without a salt (though the calculations might be a bit more difficult). In these types of problems, the thing to note is that the initial concentration for the salt (or product of the salt) will not be zero. Therefore, the equilibrium concentration for it would be initial + x.

Michelle Nwufo 2G
Posts: 61
Joined: Fri May 18, 2018 3:00 am

### Re: Calculating pH of a weak acid and its salt

Neil Hsu 2A wrote:Yes, the steps are exactly the same as calculating without a salt (though the calculations might be a bit more difficult). In these types of problems, the thing to note is that the initial concentration for the salt (or product of the salt) will not be zero. Therefore, the equilibrium concentration for it would be initial + x.

Doesn’t the change in X depended on whether the concentration of the reactant or product is greater?

Alyssa Wilson 2A
Posts: 65
Joined: Fri Sep 28, 2018 12:18 am

### Re: Calculating pH of a weak acid and its salt

Michelle Nwufo 2G wrote:
Neil Hsu 2A wrote:Yes, the steps are exactly the same as calculating without a salt (though the calculations might be a bit more difficult). In these types of problems, the thing to note is that the initial concentration for the salt (or product of the salt) will not be zero. Therefore, the equilibrium concentration for it would be initial + x.

Doesn’t the change in X depended on whether the concentration of the reactant or product is greater?

I believe so, but if you are talking about the concentration of x on the reactant side they will always have -value of x because you are losing the reactant to create equilibrium with the products.