What fatty acid has the lowest melting point?
Unsaturated fatty acids have lower melting points than saturated fatty acids of the same length. For example, the melting point of stearic acid is 69.6°C, whereas that of oleic acid (which contains one cis double bond) is 13.4°C. The melting points of polyunsaturated fatty acids of the C18 series are even lower.
The freezing point of lauric acid is 44 °C, based on the plateau observed at this temperature on the graph. 6. Freezing point depression: 44 °C - 42 °C = 2 °C. exists as neither a liquid nor a solid.
- The freezing point of lauric acid is 44 °C, based on the plateau observed at this temperature on the graph. 6. Freezing point depression: 44 °C - 42 °C = 2 °C. exists as neither a liquid nor a solid.
- m (1) where the proportionality constant, Kf, is called the molal freezing-point depression constant. Lauric acid (the solvent in this experiment) has a reported Kf = 3.9 °C. kg/mol = 3.9 °C/m. In this experiment, you will determine the freezing point of the pure solvent, CH3(CH2)10COOH (lauric acid).
- Step 1: Calculate the freezing point depression of benzene. Tf = (Freezing point of pure solvent) - (Freezing point of solution)
- Step 2 : Calculate the molal concentration of the solution. molality = moles of solute / kg of solvent.
- Step 3: Calculate Kf of the solution. Tf = (Kf) (m)
|Density||0.9408 g/cm3 (20 °C) 0.847 g/cm3 (70 °C)|
|Melting point||69.3 °C (156.7 °F; 342.4 K)|
- Myatt: Magnesium stearate is a simple salt made of two common nutritional substances, the mineral magnesium and the saturated fat stearic acid. It is used as a “flow agent” in many nutritional supplements and pharmaceuticals. Both magnesium and stearic acid are not only safe, they are beneficial to human health.
- Stearic acid also has important cleansing properties that make it useful in soaps. The ingredient acts as a surfactant, a substance that lowers the surface tension of oils. As a result, stearic acid helps to remove dirt, sweat and excess sebum from the skin and hair.
- Also, because it is under the "umbrella" of a covalent bond, we believe it will have a fast melting time. Non-polar covalent compounds (stearic acid and salicylic acid) are all insoluble in water, soluble in toluene, have low melting times, and are poor conductors of electricity because there are no ions.
Long chain fatty acids posses more carbon atoms. The carbon atoms are bonded together thereby resulting more bonds. Melting is as a result of breaking these bonds. The longer the carbon chains the higher the molecular weight of t6he fatty acids hence more energy that comes from a higher temperature.
- oil-wet. Pertaining to the preference of a solid to be in contact with an oil phase rather than a water or gas phase. Oil-wet rocks preferentially imbibe oil. Generally, polar compounds or asphaltenes deposited from the crude oil onto mineral surfaces cause the oil-wet condition.
- Being that lava, when liquid, is clearly a liquid, that makes it technically wet. The rocks over which it flows are technically wet with lava. So yes, technically lava is wet, even though we wouldn't normally use the word “wet” in that way.
- Water isn't wet. Wetness is a description of our experience of water; what happens to us when we come into contact with water in such a way that it impinges on our state of being. We, or our possessions, 'get wet'.
Updated: 29th September 2018