Question

Which of the following might be a contributing factor to low experimental purity of green crystals?...

Which of the following might be a contributing factor to low experimental purity of green crystals?

Forming the crystals too quickly by cooling it down in an ice-water bath
Over-titration
All of them will contribute to a low experimental %purity
Some green crystals are lost during filtration last week
Science   Chemistry   
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Answer #1

Answer is Forming the crystals too quickly by cooling it down in an ice-water bath.

The size of the crystal can greatly determine the purity of the crystal. This is due to the complete order of the lattice structure. One can see the inside points of the lattice structure are very precise dimensions and can only have the correct atoms at those points. You may also see that the edge points have usually only 3 to 5 bonds (Corners, Edges, and Sides). Because of this, there is a greater chance of an impurity being able to fit in one of these spaces. Therefore the purity a function of the internal volume (all of which is very pure) and the surface area.

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