oil& water mixture is hetrogeneous. salt &water mixture is homogenous?

Question

oil water mixture,is it hetrogenous ?if so why?

Answer 1

This is because salt is soluble in water while oil is not. As a result, salt dissolves in water and you get a solution. An unsaturated solution is homogenous, because there is no precipitate. On the other hand, oil cannot dissolve in water, so the best you can do is achieve a very short-lived suspension by stirring vigorously. A suspension is heterogenous, and the suspention of oil in water will separate out very quickly.

Normally, a polar solvent will dissolve polar solutes while a non-polar solvent will dissolve non-polar solutes. This situation is consistent with these rules of thumb. Water is a polar solvent and salt is a polar solute. Oil, on the other hand, is non-polar.

Answer 2

Get a strainer and run your mixture through it (this will separate the peas). Next step, heat up the mixture in a pot (to dissolve the salt molecules into the water). While the mixture is still warm, drain into another container. What is left from the origanl container is the sand (which is more dense than the mixture and will be in the bottom of the container). Next, shake up the oil and water mixture and let it stand for a few hours... since oil is less dense than water, the oil will be on top of the water (which you can then scoop out with a spoon). Now you have the water and salt mixture... to extract the salt,you can pour the mixture into a coffee maker.. turn on the coffee maker as if you're making coffee... also, be sure to put a coffee filter in the coffee maker. the water would be in the coffee pot and the salt molecules would be "trapped" in the coffee filter.

Answer 3

hetro means "different", homo means "same" (approximately). In this context hetrogeneous means having different parts - look it up in a dictionary - and homogeneous means uniform. If you understand what these two words mean then you should be able to figure out why a solution of salt water is homo and why oil floating on top of water is hetro...One point of clarification: these terms are not precise; they are relative and their meaning depends on context. At a first level of approximation if you can see different parts of something then its not homogeneous. But something like sand could be homo until you looked real close and saw the different color grains. Even if you had grains of all one color if you looked close enough they would have different sizes and shapes. The word is relative. So,e ,ight say a high school was homogeneous, but others would say the students are hetrogeneous. Neither is right - or - both are right. In materials science homogeneous means "single phase". In other parts of science it means something completely different.

Answer 4

Thats correct. Salt (e.g. NaCl) will dissolve or dissociate into Na+ and Cl- ions. The dipole forces of the water molecule is stronger that the ionic forces that bind the Na+ and Cl- into NaCl and therefore pull the crystal apart. Remember not all salts dissolve in water. For e.g., Silverchloride does not dissolve in water because its ionic forces is stronger that the water's dipole forces.

Oil molecules are comprised of large hydrophobic (means water-hating) fatty acids. The molecules are too large to "fit between" the water molecules and cannot dissolve. The forces that holds the molecule together is also to strong. Oil also has a much lower density than water and will therefore seperate and drift on top of the water. You can however force water and oil to mix, by adding an emulsifying agent. This molecule has hydrophic and hydrophilic sides that can bind to oil and water and "link" the two together. That is how mayonaisse is made.

Answer 5

When a mixture of two substances that form a interface between them the mixture is know as a heterogeneous mixture. When a mixture of two or more substances that has no interface between them it is a homogeneous mixture. Homogeneous mixture also has a single reflective index.