Question

Which would be best separated by gravity filtration?
(A) A solid precipitate in a liquid solution
(B) A mixture of oil and water
(C) A mixture of solid iron with solid sulfur
(D) Carbon dioxide gas bubbles in a soft drink
(E) A mixture of dyes in a felt-tip pen

Answer 1

Before solving we have to know that for the filtration process to works when the solute is not dissolves completely in the solvent for example if we want to separate sand and water we can separate it through the any kind of filtration process as the sand is not dissolved in the water but in case of sugar and water we would not be able to separate through filtrations as they are dissolved with each other.

Complete answer:
As per the problem we have to say which among the following would be best separated by the filtration type gravity.
Filtration is defined as the separating a substance from its mixture as one is insoluble in its solvent and other is soluble. Filtration type depends on the size of the particle. Filtration processes are of different types so we will analyze each of the options that how each solute gets separated from its solvent.
Option A is the case when a solid is solute and liquid acts as a solvent. For example sand and water when we mix sand and water then it does not dissolve with each other hence filtration is possible. We can see after some time the sand settles down at the bottom of the liquid and this is due to gravitational force the heavy amount settles at the bottom. And this kind of solution can be separated by using a special filter called gravity filter. In this process the containing solid passes through a filter paper. Now the precipitated solid remains on filter paper and in this way we can use the gravity filtrations process to separate.
But the other option such as option B. In this the oil and water can be separated easily as the oil floats on the surface of water using separation funnels.
Option C is the case where iron is mixed with solid sulfur. We know iron has a magnetic property and using a magnet we can separate the iron from the solid sulfur.
In case Option D separation takes place by removing the pressure applied on the soft drink or we can say uncapped the bottle of the soft drink for a few hours the carbon dioxide that acts as a present on the soft drinks get vaporized.
Finally in the last option we can separate a mixture of dyes in a felt-tip pen by using the process of chromatography.
Therefore the correct option is (A).

Note:
Remember that the process of chromatography which we used above is defined as a process of separating components of mixture. Note that the gravity filtration is a method of filtering impurities from solution using gravity to pull liquid through a filter.