## Calculating pH of salt solution with acidic cation

Acidity $K_{a}$
Basicity $K_{b}$
The Conjugate Seesaw $K_{a}\times K_{b}=K_{w}$

cara_cavarretta_3F
Posts: 32
Joined: Fri Sep 28, 2018 12:23 am

### Calculating pH of salt solution with acidic cation

Hey friends,
I read that we won't need to know the Ka and Kb constants until 14B, and these are necessary for Examples 12.10-11 in the 6th edition, so will we not be responsible for knowing how to do these kinds of calculations on the final?
Thanks

Alana Sur 3B
Posts: 61
Joined: Fri Sep 28, 2018 12:25 am

### Re: Calculating pH of salt solution with acidic cation

I don't think we don't need to remember the constants but you should know the formula for calculating Ka and Kb

Henry Dudley 1G
Posts: 61
Joined: Fri Sep 28, 2018 12:16 am

### Re: Calculating pH of salt solution with acidic cation

Alana Sur 3B wrote:I don't think we don't need to remember the constants but you should know the formula for calculating Ka and Kb

The formula for calculating Ka is just -log(PKa) and the formula for calculating Kb is just -log(PKb) right?

Alana Sur 3B
Posts: 61
Joined: Fri Sep 28, 2018 12:25 am

### Re: Calculating pH of salt solution with acidic cation

Henry Dudley 1I wrote:
Alana Sur 3B wrote:I don't think we don't need to remember the constants but you should know the formula for calculating Ka and Kb

The formula for calculating Ka is just -log(PKa) and the formula for calculating Kb is just -log(PKb) right?

And that Ka = [Concentration of product1][ Concentration of product2]/ [Concentration of Reactant]

Alana Sur 3B
Posts: 61
Joined: Fri Sep 28, 2018 12:25 am

### Re: Calculating pH of salt solution with acidic cation

We don't include the products and reactants in liquid state when calculating that^^

cara_cavarretta_3F
Posts: 32
Joined: Fri Sep 28, 2018 12:23 am

Thank you!!