[wingsofselkhet]

I'm currently doing a lab in which we are required to identify 12 unknown solutions. I'm pretty sure 2 of the solutions are potassium carbonate and sodium bicarbonate solution, and I've also identified lead (II) nitrate, silver nitrate and barium chloride. I'm trying to figure out what precipitates these three solutions will form with the potassium carbonate and sodium bicarbonate, but I can't remember what color these precipitates should be. My lab partner has my data for the reactions, so I can't remember which precipitates are which color. I know *one* of the precipitates was a bright mustard yellow, but I don't remember which one it was.

If anyone has seen these precipitates and can help me identify their color, I'd really appreciate it...if the colors don't match, then we could've identified the solutions wrong, which would mean we have to re-do the lab all over again. So, here we go:


I know the lead carbonate precipitate is white, but what color is lead (II) bicarbonate?

Different websites identify silver carbonate as white, tan and yellow. Which is it?

I can't find *any* data on silver bicarbonate. Does it even exist?

I'm pretty sure barium carbonate is white, but I'm not 100% sure.

The only data I can find on barium bicarbonate makes references to its being soluble in water. Is this true?

I vaguely remember that the bright mustard yellow precipitate occurred in a reaction with the lead (which we have positively identified through a flame test), but this doesn't make any sense, since lead carbonate is supposedly white...

Thanks!

[AWK]

Different websites identify silver carbonate as white, tan and yellow. Which is it?

Siver carbonate is white, but after some time (especially when warming) it change color because of decomposition
Ag2CO3 = Ag2O + CO2
and become pale yellow, yellow, brown yellow, and finally brown.