What is the effects of aninsoluble impurity on melting point determination?

Question

* an insoluble

Answer 1

If impurity is insolube in base metal, we haven't new product such as alloy or other componds, so this impurity has no influence on melting point of the "base metal". but, in determination of melting point of complex we can consider two state for impurity:
a) melting point of insoluble impurity is less than the base metal (like as lead in silver), with increasing the heat, impurity will melt first as a seperated phase.
b) melting point of insoluble impurity is more than bese metal (like as copper in gold), in this case the base metal melts first and the impurity will seperated as solid phase.
anyway, the specification of impurity is impotrant.

Answer 2

although a insoluble impurity can modify the amount of heat that is required to cause a state change, it will not modify the freezing temperature.

If the insoluble is in the form of large particles, such as an Ipod or a brick, it could affect the determination of melting point by:

1. in the case of a brick: impede the insertion of a temperature measuring device.

2. In the case of an i-pod: causing the student to drop the temperature measuring device on the floor and break it while attempting to rescue the ipod.

Answer 3

An impurity both lowers the melting element and will advance the melting element variety. this facilitates you to both be sure the purity of a compound, as well as make a favorable id of an unknown compound. enable's say for instance that you've in basic terms synthesized cinnamic acid contained in the lab, for which the organic compound has a melting element of 133 stages. in the experience that your compound has a melting element of 128-one hundred thirty stages, it maximum likely isn't overly organic. as well, you may blend a small quantity of organic cinnamic acid at the same time with your synthesized compound. If this has no effect on the melting element variety, your synthesized compound is in reality cinnamic acid. If including organic cinnamic acid reduces the melting element to 124-127 stages, the compound isn't cinnamic acid.

Answer 4

if it's melting point determination then the result would be broad range of temperature with which the crystals will melt
if it's melting point itself, then it would be lower as in the colligative property freezing point depression since the freezing pt is just the exact opposite of melting pt