## JoBo 3 years ago Will a precipitate form if 100ml of 1.0x10^-3 mol/L Pb(NO3)2 solution is added to 100ml of 2.0x10^-3 mol/L MgSO4 solution?

1. JoBo

@Callisto can you help me?

2. Callisto

Yes... PbSO4 is insoluble

3. Callisto

\[Pb(NO_{3})_{2} (aq) + MgSO_{4} (aq) -> PbSO_{4}(s) + Mg^{2+}(aq) + 2NO_{3} ^{-}(aq)\]

4. mos1635

if Ksp of PbSO4 is given we could have a more acurate investigation.....

5. JFraser

a ppt may or may not form, it depends on the concentrations. Ksp calculations will determine whether the combination of ions is concentrated enough to give a ppt.

6. Callisto

I'm sorry!!! I haven't learnt anything about Ksp ... so I don't know that ppt may not form ... I'm sorry...

7. JFraser

@Callisto you are generally correct, a ppt will probably form because PbSO4 is insoluble, but if the concentrations are weak enough, there won't be a ppt

8. Callisto

@JFraser Thank you for giving more information. Consider this case, would there be any ppt?

9. JFraser

give me a few minutes to work through the numbers, i have to go teach soon

10. Callisto

Thank you!!!!

11. JFraser

in this case,a ppt will not form. the concentration of the combined ions is less than the maximum allowable by the KSP

12. Callisto

Sorry again.. I know I have no right to ask, but can you show how you get the answer?