How do precipitation reactions behave in the absence of gravity, say on the International Space Station (ISS)? I have seen water taking the shape of a sphere and not that of the container in space due to its surface tension. It takes a spherical shape in order to minimize the energy due to forces of surface tension. In space all directions are equivalent and hence there is no notion of up or down.
In precipitation reactions, generally, the precipitate formed either floats on the surface or settles down. I know the solid particles will be formed in space due to the chemical reaction between the reactants. What will happen to the solid particles (precipitate), will they concentrate at the centre of the sphere of the reaction mixture (solution) or will they come to the surface, or will they remain suspended, or is there any other possibility? Has such an experiment been done on the ISS to date?
For reference, this is how water looks in the absence of gravity:
Please note: Water is coloured to enhance visibility