What should i do to get copper carbonate to precipitate cleanly in a home lab?

[Hannah_J]

I’m trying to precipitate copper carbonate in my home lab by mixing solutions of copper sulfate and sodium carbonate, but I keep getting this gelatinous blue mess instead of the nice solid powder I expected. I’m wondering if my concentrations are off or if the temperature during mixing is causing this inconsistent texture.

[JohnL]

I've seen that exact blue gelatinous mess when copper sulfate meets carbonate, and that ends up as copper carbonate forming with a lot of water. In my few tries, adding the carbonate slowly with a stir and letting it settle helped form discrete particles instead of a gel. Temperature mattered a bit—warmer mixes bubbled and stayed soft longer, cooler ones clumped faster.

[Scarlett65]

I wonder if the problem isn't the texture but the phase. In water, copper carbonate tends to hydrate or form basic copper carbonate, which looks blue and mushy. The amount of carbonate and the pH drift can push it that way. I wouldn't bet on temperature alone.

[Sofia85]

Concentration changes things a lot. Using more concentrated copper sulfate solution often gave a fluffy precipitate, while weaker ones pulled out a finer powder but it stayed wet longer. In the end, I think the rate of addition matters more than the exact temp.

[Emily_G]

One day I just left the flask mostly undisturbed and let the solid settle for hours; what I saw was a clump that finally dried into something more powdery after a few days. Still not perfect, but it was a different texture. Have you tried gentler mixing or slower addition?