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What happens in this mixture?
What if I placed solid crystals of copper sulfate(CuSO4) in a test tube containing distilled water? Will the CuSO4 diffuse? How does diffusion happen in this mixture?
We had an experiment and it implied that what happened was diffusion... Are you guys sure that it isn't diffusion?
3 Answers
- Dr WLv 71 decade agoFavorite Answer
ions will diffuse through a liquid until the system reaches uniform concentration.
CuSO4 is soluble in water up to 31 g/100ml. so if you put less than 31g/100ml, it will dissolve. however,
the rate of dissolution will slow down as the liquid immediately surrounding the crystals becomes saturated with the Cu2+ and SO4 2- ions. as that localized liquid is saturated, the ions will diffuse to portions of the liquid containing lower concentrations of ions.
diffusion occurs because of two things. brownian motion (ie random movement of particles) and the desire for a system to be at lowest energy state (entropy).
I've attached a link below if you like.
- Roger SLv 71 decade ago
CuSO4 -> Cu(+2) + SO4(-2)
The copper sulfate will form positive copper ions and negative sulfate ions. Water is a polar compound, and acts like a tiny magnet. The positive hydrogens in water are attracted to the negative sulfate ion. Water's negative oxygen atom attracts positive copper ions. Water molecules surround the ions and separate them. This is how ionic substances dissolve in water.
Source(s): I'm a chemist! - 1 decade ago
it is not the diffuse
CuSO4 is soluble in water so the crystal dissolve in water but if the water is cool you have to jerk the testtube
in hot water it easily gets dissolved
