[JoachimF]

Good evening!

I hope this question isn't too stupid, but I am supposed to find the pH-value in a 0,010 M solution of CH₃COONa. I figured I need the kP_b to solve this, and in my book, the basicity of CH₃COONa isn't listed, though, the basicity of CH₃COO^- is. I checked on wikipedia, and found that the basicity is the same for CH₃COO^- and CH₃COONa. Surely there must be something very fundamental I have missed here? Why does the two have the same basicity? Doesn't the Na⁺-ion make any difference on the basicity?

Thanks in advance!

Cheers,
Joachim

[Yggdrasil]

In solution, sodium acetate dissociates into sodium ions and acetate ions.

[JoachimF]

Thank you, I knew I was missing something very fundamental:P

Cheers=)

[JoachimF]

By the way, just to make sure: This means that the pH-value of a solution with CH₃COO^-, is the same as a solution with CH₃COONa (taking into account that concentration, etc. is the same)?

Edit: That must be wrong?

If I am to find the pH value of CH₃COONa, I would find the molar mass of CH₃COONa, find how many mol's, then make a 2nd degree polynomial equation with x, the amount of mol and the basicity of CH₃COO^-? Does that sound right? 

[Yggdrasil]

That sounds about right.