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That will depend very much on what is being dissolved and what it is being dissolved in. Water will dissolve many substances to a greater or lesser degree. For example, salt will dissolve easily in water but there is a limit on just how much will dissolve in a given volume of water and when the water will not allow any more to be dissolved in it, the salt water solution is said to be saturated.
The solubility of sodium chloride in water, at 80 0C, is 37,93 g NaCl/100 g water.
Yes, to a point where too much is dissolved.
No. Freshwater does not have the same amount of dissolved materials as sea water. Sea water has a much greater amount of salt dissolved in it.
Solubility.
alot
It does not matter what the material dissolved in water. The only thing that matters is how much is dissolved. So neither.
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The amount of sodium chloride that would dissolve in 2 L of water at 20 degrees Celsius depends on if the water is moving. It would dissolve faster in moving water than still sitting water.
Blood plasma is about 91.5% water. The rest is proteins and dissolved elements.
Pure water can dissolve pretty much anything, at least to some degree (this degree may be vanishingly small for some materials, in which case we say they're insoluble in water).Lipids generally dissolve pretty well in water by forming micelles (like tiny bubbles, with the polar end out and the non-polar end pointed in).
Oxygen in the water is called "dissolved oxygen" because quite simply it is just that. The air naturally diffuses into the water and can reach equilibrium with the water. It is virtually impossible to get too much dissolved oxygen in the water because the excess will convert back to gas and bubble out of the water like so much soda water when you pour it out of the bottle. This said, there is no concern for too much dissolved oxygen in the water. Concern arises when dissolved oxygen levels get too low. When this happens more sensitive plants and animals become weak or die. As a side note, weather, temperature, and salinity all effect dissolved oxygen levels. Faster moving water contains more dissolved oxygen because it has more contact with the air than still water. Cold, fresh water holds more oxygen than warm or salty water. This would mean a cold, fast moving, fresh water stream or river would contain the highest amounts of dissolved oxygen, and the salinity of the ocean water would not be ideal for holding as much dissolved oxygen.