Calculate the activity of the chloride ion in a solution

[il postino]

Homework Statement

Calculate the activity of the chloride ion in a solution

Relevant Equations

Ionic force

Hi everyone!
I have to calculate the activity of $Cl^{-}$
I have a solution formed by $Na_{2}SO_{4}$ 0.0016 m + $NaCl$ 0.0014m + $FeCl_{3}$ 0.0012m

I calculated the ionic strength $I$
$I=0.0134$

The activity of the chloride ion is $a_{Cl^{-}}=m_{Cl}*\gamma _{Cl}$

But I don't understand how to continue when it is a mix.
Could you help me?
Thank you very much!

 

[Borek]

What is the concentration of Cl^-?

 

[il postino]

What is the concentration of Cl^-?

0.0014m + 0.0012m = 0,0026m

How do I continue?
Thanks Borek

 

[Borek]

And for a given I what is the activity coefficient for an ion with a single charge?

 

[il postino]

And for a given I what is the activity coefficient for an ion with a single charge?

$m_{Cl}*\gamma _{Cl}$

$log(\gamma _{Cl})=-A.|Z|.\sqrt{I}$

If I calculate $\gamma _{Cl}$ can I calculate the activity without problems?

 

[Borek]

Plug and chug.

 

[il postino]

And for a given I what is the activity coefficient for an ion with a single charge?

aCl−=mCl−∗γCl−

Plug and chug.

Muchas gracias Borek! (In Argentina jaja)
Thanks!