yes, alum does react with crude oil
Alkali react with greases and oils forming water soluble soaps.
They are so reactive they even react with the moisture in the air. Storing under oil prevents this.
An ionic compound can form interactions with water. Water happens to be a polar molecule. The positive ions are going to react with the partially charged negative ions (that are in the water). The negative ions will react with the partially positive charged hydrogen atoms in the water. But the ionic compound won't dissolve in oil because it can't form the same reaction.
Oil reacts with detergent, but that's about it.
Oil and water do not chemically react.
so that it cannot react with water, as when sodium and water react it is violent, so the oil keeps the water away
There are various grades of oil.
Potassium is chemically very active. It will react with oxygen and/or water vapor in the air, so it is stored under oil to keep it out of contact with the air. It doesn't react with the oil.
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Water and oil will separate if the two are combined. The water will be at the bottom while the oil site on top. Just like in a lava lamp some colors float while others sink.
yes, alum does react with crude oil
No. Potassium will react violently on contact with water. Potassium is stored under oil to protect it from air and water.
Alkali react with greases and oils forming water soluble soaps.
They are so reactive they even react with the moisture in the air. Storing under oil prevents this.
Methanol does not react with water.
No. sulfur does not react with water.