Question

Organic Chemistry Lab Question:

1.Describe how one can determine the difference between a solid that has crystallized from solution versus one that has precipitated from solution. Assume the solid has already come out of solution and that you did not observe the process but were given an Erlenmeyer flask with the solid product suspended in the solvent.

2. Unknown A and Unknown B are both solids at room temperature. A mixture of 2.00 g of A and 2.00 g of B in a beaker at room temperature results in a liquid.   Briefly state what can be conclude about Unknowns A & B based on these results.

Answer 1

Solution :-

Q1 ) When the solid is precipitated from the reaction then it do niot have perfect crystal structure and also it may contain some impurities.

But when the solid is recrystalized then it forms the perfectly srystal structueres and gives crystals of the solid and it is very pure.

Or another possibility is that one of them either A or B is having low melting point thats why the it melt to form liquid and then it dissolves the other solid into that liquid.

Q2 ) When unknown A and B are mixed toghther then they may form new product with the lower melting point thats why the form liquid at room temperature. Or we can say that the A and B have low melting points thats why they melt to form liquids at room temperature.