How Do You Determine Ksp for Silver Sulfate?

[jeahomgrajan]

Homework Statement

Ok, to determine ksp we need to know the concentratison of Ag+2 and SO4-2

Homework Equations

to find ksp for calcium hydroxide we used titration

The Attempt at a Solution

i was thinking about evaporting it
but I am not sure if I am right, help...

 

[Borek]

Are you asked to desing the experiment? What analytical techniques are available to you?

 

[jeahomgrajan]

i am able to use anything

 

[Borek]

What analytical techniques of determining concentration do you know?

 

[jeahomgrajan]

i don't understand what you are trying to immpply

 

[Borek]

Nothing yet, so far I have just asked a question.

To determine Kso you have to find out concentration of Ag⁺ and/or SO₄^2- in the saturated solution. There are numeorus techniques that can be used, starting with classic - titrimetry, gravimetry, ending with instrumental methods - like spectroscopy or electrochemistry. Which of those do you know?

 

[jeahomgrajan]

Well for one experiment i did a titration lab to determine ksp, but for this lab my teacher was refeering to heating the silver sulfate... and I am not sure what he is trying to say, so that is basically what i am asking, how can you determine the ksp for silver sulfate by eheating it ?

 

[Borek]

No idea what he refers to, colud be that drying out is the idea - but IMHO it doesn't make sense. There is slighly below 1 mg of the solid per 1 mL of the solution, to get reasonable accuracy you will have to evaporated a lot of solution.

 

[jeahomgrajan]

alright suppose you do titration , which acid can you use?and why

 

[Borek]

You can't use acid for titration in this case. There is no base that can be neutralized. Titration is not only for acid/base determination. There are methods - Mohr, Fajans - that can be used for silver determination, however, I don't think they will work here - silver concentration is too low.

 

[jeahomgrajan]

In this case what method would you use...

 

[Borek]

Ion selective electrode sounds the most logical approach.