Question

The combination of ions most likely to produce precipitate is :

Li+ and PO4 ^3-
PB^2+ and NO3^-
Nh4+ and SO4^2-
Mg^2+ and C2H3O2^-
Fe^ 3+ and OH-

Sorry!! last question on our open test!! I really appreciate the help!!! :D
We are stuck on this! ):

Answer 1

you need to look at a solubilty table, or better yet, a table of solubility product constants. (Ksp). im leaning towards iron (iii) hydroxide but you should double check it.

Answer 2

Hm.. So what exactly are we looking for in a solubility table, do both of the compounds have to be aqueous?

Answer 3

PB^2+ and NO3^- is the answer. Assuming this is an aqueous solution, lead nitrate is the least soluble compound. http://en.wikipedia.org/wiki/Lead%28II%29_nitrate

Answer 4

Thanks, I'll check out the link!

Answer 5

nope. Lead(II) nitrate's solubility in water is 37.65 g/100 mL (0 °C) which is pretty darn soluble.