What are some of the ways you can identify seawater from distilled water?

1.Look at who is heavier in equal volumes, and the heavier is seawater. The same can be seen in terms of buoyancy, and the buoyancy is the seawater.

2.Fill half a bottle and shake it vigorously, the sea water has foam.

3.Open the bottle and smell it, the sea water smells.

4.Put the same volume in the refrigerator and freeze. After turning into ice, it is seawater.

5.Boil and there is salt precipitation.

6.Mix slowly, layering the seawater underneath.

It's a lot, I thought about it myself.

1. To test NA+, you can use flame color reaction. The flame color of the sea reacts, and the flame is yellow.

2. Check Cl-, use silver nitrate solution, and produce white precipitate in seawater.

3. Detect Mg2+, with NaOH solution, seawater produces white precipitation, which may not be obvious, because the amount of salt is small.

4. To test Ca2+, with Na2CO3 solution, the seawater produces white precipitation, and the phenomenon may not be obvious.

5. Measuring the conductivity, seawater contains salt, and the conductivity is much stronger than that of distilled water.

The simplest method is the heating method, and the crystallization is seawater.

Many other chemical tests, such as:

Silver nitrate solution, which has precipitation in seawater.

Silver chloride. Sodium hydroxide solution, which has precipitation in seawater.

Magnesium hydroxide.

A small amount of AgNO3 solution was used to drop the samples separately, and the white precipitate was seawater, and the distilled water was still clear.

ag+cl-

AGCL precipitation.

Two simpler physical tests are given:

At atmospheric pressure, the freezing point of seawater is less than that of distilled water (around the left) and the boiling point is about (.

Evaporate. It is seawater that has crystals that precipitate.

Taste the taste. Add agno3

There is precipitation in seawater.

Be. The seawater after distillation is distilled water.

pure, but desalination.

The cost of distillation is too high, and some low-cost purification methods are being developed, such as biofilm desalination. Distillation is a method of heating seawater to boil and vaporize it, and then condensing the steam into fresh water. The distillation desalination technology is the earliest desalination technology for industrial application, which is characterized by its application even in the heavily polluted and highly biologically active seawater environment, and the produced water has high purity.

The live steam is fed into the inside of the evaporation tube, which has the highest temperature, and when condensation occurs in the pipe, the amount of evaporation outside the tube is basically the same as that of condensation. After passing through the concentrated brine droplet separator to ensure the purity of the distilled water, the secondary steam is introduced into the heat transfer tube of the next effect, and the operating temperature and pressure of the second effect are slightly lower than that of the first effect.

This evaporation and condensation oversells along a string of evaporators.

Each effect is repeated, each of which produces a considerable amount of distilled water, until the last effect of steam is cooled by seawater in the heat exhaust section.

Condensation. Although multi-effect distillation is the earliest used desalination technology, it has not been widely used due to problems such as scaling and corrosion.

1. The principle of distillation is very simple, that is, the principle of preparing distilled water in the laboratory. The seawater is boiled, the fresh water evaporates into steam, the salt remains at the bottom of the pot, and the steam condenses into distilled water, which is fresh water.

2. This ancient seawater desalination method consumes a lot of energy and produces a lot of pot scale, making it difficult to produce fresh water in large quantities. Modern multi-stage flash distillation slag mountainization has rejuvenated the ancient distillation method.

3. Before distillation, prepare at least two receiving bottles. Because the liquid with a lower boiling point is evaporated before the boiling point of the desired substance is reached. This part of the distillate is called the "pre-distillate" or "head".

After the distillation of the previous fraction and the temperature tends to be stable, the evaporation is a more pure substance, at this time, it should be replaced with a clean and dry receiving bottle to accept, and the reading of the thermometer when this part of the liquid begins to be distilled and the last drop, that is, the boiling range (boiling point range) of the fraction.

4. The general liquid contains some high boiling point impurities more or less, after the required fraction is evaporated, if the heating temperature continues to increase, the reading of the thermometer will increase significantly, if the original heating temperature is maintained, there will be no more distillate evaporation, and the temperature will drop suddenly. At this point, distillation should be stopped. Even if the impurity content is very small, do not evaporate to avoid the rupture of the distillation flask and other accidents.

5. After the distillation is completed, the heating should be stopped first, and then the water should be stopped and the instrument should be removed. The order of dismantling the instrument is reversed from the order of assembly, first removing the receiver, then removing the tail tube, condenser tube, distillation head and distillation flask, etc.

Be. The distilled seawater is distilled water, a pure substance, but the cost of distillation is too high for seawater desalination, and some low-cost purification methods are being developed, such as biofilm desalination. The distillation method is a method of boiling and vaporizing seawater by heating seawater, and then condensing the steam into fresh water.

Distillation desalination technology is the earliest desalination technology for industrial application, which is characterized by its high purity even in the heavily polluted and highly biologically active seawater environment. Mu Ming Wang Xunzai.

Example of chloride detection: Dropwise addition of silver nitrate solution acidified with nitric acid, white precipitate is seawater (seawater contains a large amount of chloride ions).

4. Conductivity test method: the liquid to be tested, wires, bulbs (diodes or other electrical appliances that can react significantly when energized) power supply is correctly connected into a closed loop, and it is seawater (seawater can conduct electricity) that can make the bulb shine

5. Density measurement: The denser is seawater.

There are many other methods, here are several commonly used methods for reference, the specific experimental operation and process have not yet been given, please forgive me.