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How does the melting point of the crude sample compare with that of the purified sample?
Wiki User
∙ 6y ago
An impure sample will have a lower melting point, and will also have wider melting point range than that of a pure sample of the same substance.
a sharp melting point range can also indicate a eutectic mixture
Wiki User
∙ 14y ago
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What is the melting point for crude oil?
the Melting point depends on different types of Crude oil.. Crude oils are of different types ..so there is no specific Boiling point
Why are sulfuric acid and sodium hydroxide needed in crude fiber determination?
The acid and the base are used to remove all the other "stuff" from the sample, and leave only the fiber. There are challenges in that when we remove the sugar and starch (acid hydrolysis), and the protein and carbohydrates (the base hydrolysis), we should have just fiber left. But some of the fiber is lost to the two-stage chemical hydrolysis we just ran the sample through. We are then left with the challenge of making an estimate (the "determination") of the crude fiber based on what we know about the sample, about the procedure and about the quantity of the fiber we observe at the end of the chemical processes.
What is the boiling point of crude oil?
boiling point of crude oil is depending on the main component in the crude oil itself, heavy crude for example has a higher boiling point from light crude.
What are crude densities?
What is crude densities? Crude densities are measured in api gravity. Api gravity is found by placing a hydrometer in a cylinder of crude at 60 degrees Fahrenheit and reading the depth the hydrometer has sunk into the crude.
Can crude oil can be a liquid or a gas?
Crude Oil is a liquid.
What is the melting point for crude oil?
the Melting point depends on different types of Crude oil.. Crude oils are of different types ..so there is no specific Boiling point
Why is the weight of purified caffeine lower than the weight of crude caffeine?
The purified caffeine weighs less because the impuriries have been removed.
Zone melting and application of crude oil?
Zone melting is used for the purification of some inorganic materials or metals; any relation with the crude oil.
What is crude palm oil?
Crude palm oil is actually the oil extracted from palm kernels before it is purified. It is edible and is quite delicious.
What is the melting point of crude aspirin?
128 degree centigrate
What is fold purification in protein purification?
A measure of how much more pure your protein is after a purification step in comparison to the crude. You can calculate this by dividing the purified steps specific activity by the crude steps specific activity.
Is petrol from the earth?
Petrol is crude oil that has been purified on earth. It gets purified through processes such as fractional distilation. This is what goes in your car. Crude oil came from when most of the earth had forest and when organisms died they got compacted in a way that made them produce oil over a extremly long period of time. So in a nut shell petrol is from earth.
What is the purpose of developing melting point for crude and recrystallized aspirin?
To make a compound more stable at storage temperature
What is role of CTAB - NaCl?
Often used to purified crude cell lysate by precipitating proteins, lipids and polysaccarides out of solution. This leaves only nucleic acid (DNA, RNA) in the supernatant.
A 5 liter sample of one type of crude oil has a mass of 410 kg what is the density?
410Kg/5L=82Kg/L
How would you compare Russians fighter jets against America?
Russian aircraft in general are fairly crude compared to American and European examples
Does an ice cube melt faster with or without salt?
Any impurity(something that does not belong to the compound but is present in the compound) has effects on the boiling and melting points of a given substance. From yahoo answers,An impurity causes the melting point to deviate from the standard. Actually, it makes the magnitude of the melting point lower. For example, the melting point of benzoic acid is 122.4 degree Celsius. When we did this in the laboratory, we got 120 degree Celsius because of the impurity present which is sodium sulfate.An impurity also causes the melting point to become a melting range. The melting point is not anymore sharp, but a range of values. The more impurities present, the greater the range of values. For example, when we purified crude acetanilide via recrystallization, we obtained a melting range of 105-116 degree Celsius. By the way, the standard melting point of acetanilide is 113-115 degree Celsius.So basically, those are the two effects that impurities have on melting point iof a pre compound. I learned that it is because the impurities "defect" the crystal lattice of the compound. A pure compound is a structure of high molecular symmetry. An impurity is rather assymetrical, or is a poorly organized structure. If the impurites are present with the pure compound, the melting point will deviate because melting point is also dependent on the high symmetry and organization of molecular structures, just as the vapor pressure. This is the principle involved in Sublimati
