What is the cause of hygroscopy? - Chemistry Stack Exchange
2015年8月2日 · Ions are hygroscopic because they form very stable, low energy hydrates, which are thermodynamically favorable over water vapor. I.E. salt attracts water vapor because the hydrated salt is lower energy than the water vapor. Other very porous materials are hygrosopic due to capillary action.
Hygroscopic Substances and Drying Agents - Chemistry Stack …
2018年10月2日 · all drying agents are hygroscopic substances. First Terminology: Hygroscopic: Absorbs water from air Drying agent: Removes water from organic substance. Your book did not exclude other materials from being considered drying agents. It just said many of the substances that are hygroscopic are also useful as drying agents.
everyday chemistry - Is there a point at which Ethanol (E10) fuel ...
2013年3月2日 · In addition, sulfuric acid is even more hygroscopic than ethanol; at concentrations in water as low as 10%, it'll attract more water. Lastly, acids and alcohols form esters, in our case ethyl sulfate, and esters and alcohols form ethers, here diethyl ether (with the sulfuric acid and water as a byproduct).
hygroscopicity vs solubility - Chemistry Stack Exchange
2017年11月30日 · Phenols are hygroscopic and form a red liquid, upon contact with air. Yet, Phenol’s solubility in water is said to be moderate. ( Tilted to the low solubility side) This is explained with the benzene ring being non polar. Then how can it be hygroscopic? Are solubility and hygroscopicity even related at all, then?
Ethanol and water hygroscopic equilibrium concentration
2014年7月17日 · You have a closed system with (say) 100 gallons of (say) pure ethanol and 100 gallons of moist air. There is not enough water in the air to go into the ethanol and reach the azeotropic ratio -- not by 2 or 3 orders of magnitude (see below).
Hygroscopic behaviour of DMSO - Chemistry Stack Exchange
In the MSDS of DMSO I find that the liquid is hygroscopic, meaning it adsorbs moisture from the surrounding environment. Unfortunately, I cannot find anywhere how much water will be absorbed (mass%) or how quickly this will happen, is it saturated in minutes, hours, days?
water - Does storing a hygroscopic reagent in a bottle makes it …
2015年10月30日 · Does storing a hygroscopic reagent in a bottle makes it prone to absorb humidity from the air trapped inside? Yes, there is that tendency. I'll make a couple of points which I'll number for possible further discussion. (1) 99.5% acetone is probably 0.5% water.
Is 70% ethanol hygroscopic? - Chemistry Stack Exchange
2017年7月11日 · 85% ethanol made with nuclease free water (Note: 85% ethanol is hygroscopic. Fresh 85% ethanol should be prepared for optimal results) I know that this is even more pronounced for 100% ethanol. But I'm wondering if . 70% is still "very" hygroscopic so that the concentration might change over time.
What is the difference between a desiccant and a deliquescent?
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reaction mechanism - What makes these particles hygroscopic ...
2016年1月14日 · The composition of petrol diesel is very different, that's why it is not as hygroscopic as biodiesel. As far as I know hygroscopy depends mostly on polarity . The water molecule is a polar, so it likes to mix with other polar compounds, like KOH, glycerol, salt, sugar, H2SO4, etc. Apolar compounds repel water.