How to separate clean water from salt water

Salt water is more buoyant than clear water.

The specific gravity of salt water is greater than that of clean water.

Taste with your tongue.

Add a little salt, and the first thing to dissolve is water.

Yes, distillation of sublimation salt crystals.

It can be measured by saturation. Take two kinds of water of the same volume, add a certain amount of excess salt respectively, and the remaining unmelted salt particles are more salt water, and less is clear water. Of course, if the salt content of the brine is quite low before salt is added, this method will not work.

Taste it and you'll be separated.

Law 1Find a seed and put it in, and it will float in the salt water.

Law 2The same volume weighs, and the heavy is salt water.

Law 3Take a sip, salty is salt water.

Take a small amount of sample and heat it to dry.

The one with the white powder remaining is the salt water.

The clear water is transparent, the salt water is slightly less transparent, whitish, and the most effective way is of course to use the tongue!

1. The salt reacts with the acid to form another salt and another acid. For example: Na2CO3+2HCl=2NaCl+H2O+CO2

2. The salt reacts with the alkali to form another salt and another base. For example: Na2CO3 + Ca(OH)2=CaCO3 +2NaOH

3. Salt reacts with salt to form two other salts. For example: BaCl2 + Na2CO3 = BaCO3 + 2NaCl

The reactants are required to be accommodating).

Metal displacement reaction.

Sour. Salt – must be soluble In the new salt that is generated, there must be precipitation, gas, or water that is difficult to ionize.

There are two glasses of liquid in the laboratory, how to distinguish which is concentrated salt water and which is water, you can choose your own experimental equipment.

Answer: Method 1: Add silver nitrate solution dropwise, and the precipitate is saline, otherwise it is water.

Method 2: Put it in an evaporation dish and dry it with an alcohol lamp, and those with white crystals precipitate are concentrated salt water, and if there are none, they are water.

Method 3: Use a density meter, the higher density is salt water, and the smaller one is water.

Method 4: Use the semi-permeable membrane method, bundle the semi-permeable membrane at one end of the straight glass tube to seal, make a semi-permeable membrane test tube, add the sample at the other end, and then insert the semi-permeable membrane end of the semi-permeable membrane test tube containing the sample into the clear water, after a period of time, observe, if the liquid level in the test tube rises, the sample is concentrated brine, if there is no change, it is water.

1. Heat two liquids separately, and the precipitation of solid is salt water, and the absence of water is water;

2. Take samples, add silver nitrate solution dropwise, there is white precipitate is saline, and there is no water;

3. Determine the density, the high density is salt water, and the small density is water;

4. Put an egg in it, the floating is salt water, and the sinking is water;

5. Measure the temperature of two liquids when boiling, the low temperature is salt water, and the high temperature is water;

6. Add a certain amount of alcohol, the turbid is salt water, and the non-turbid is water;

7. Measure the conductivity, the solution conducts salt water, and the water has no conductivity;

8. Add silver nitrate solution dropwise, there is white precipitate is saline, and there is no water;

1. Heat two liquids separately, and the precipitation of solid is salt water, and the absence of water is water;

2. Sampling, add silver nitrate solution dropwise, there is white precipitate is saline, and there is no hunger for water;

3. Determine the density, the high density is salt water, and the small density is water;

4. Put an egg in it, the floating is salt water, and the sinking is water;

5. Measure the temperature of two liquids when boiling, the low temperature is salt water, and the high temperature is water;

6. Add a certain amount of alcohol, the turbid is salt water, and the non-turbid is water;

7. Measure the conductivity, the solution conducts salt water, and the water has no conductivity;

8. Add silver nitrate dissolved bush blind liquid dropwise, there is white permeability, empty color precipitation is saline, and there is no water;

Judging by whether there are white crystals precipitated:

Two drops of liquid of the same volume are placed next to each other on a clean and dry glass sheet, and when they are dry, a large amount of crystals precipitates out of the "concentrated brine". (precipitation of "chloride") is judged by the chemical method that produces the precipitation (in the case of salt water):

The same volume of two liquids is acidified with a little nitric acidification, and then a drop of silver nitrate solution is added dropwise, and a large amount of white precipitate is produced by "concentrated brine" (precipitation of silver chloride). It is "water" that produces a small amount of precipitation

If it is "pure water", there is no white precipitate).

Judging by the density of the solution:

The density of concentrated brine should be greater than that of water, and their density at the same temperature is determined.

Chemical analysis method: to check whether "salt ions are present" and determine whether it is salt water. Wait a minute.

1. Heating, there is solid precipitation is salt water, and it will not be water.

2. Sample and add silver nitrate solution, there is white precipitate is saline, there is no water 3, determine the density, the large is saline, and the small is water.

4. Put an egg in it, it will float in salt water and sink in water.

1。To taste, salty is salted water, and unflavored is distilled water.

2: Take a small amount of silver nitrate solution dropwise each, there is white precipitate is salt water, and no change is distilled water.

3: Take a small amount of each and heat it in the evaporation dish, there are crystals precipitated in salt water, and there is no distilled water.

4。Put the radish strips in two liquids and take them out after a while, and the radish strips become soft with salt water.

5。The density of two liquids is measured, with the denser being brine and the smaller being distilled water.

Methods from easy to difficult:

1. Taste with a sense of taste, the salty is brine.

2. Measure the conductivity, the solution conducts electricity is saline.

3. Put the half-boiled eggs in the solution, and the eggs are suspended in brine.

4. Boiled and evaporated, there are crystals precipitated in brine.

5. Measure the temperature of the liquid when boiling, and the low temperature is the brine.

6. Put it in a transparent freezer, and the salt water that freezes after it freezes.

7. Insert the capillary into the liquid, and the lower rise of the liquid level in the capillary is the brine.

8. Add a certain amount of alcohol, and there is turbidity in salt water.

9. Add silver nitrate solution dropwise, and there is a white precipitate of saline.

10. When electricity is applied to the liquid, it is brine that produces yellow-green gas at the anode.

1.With a density meter, the denser is the brine.

2.Heat until boiling, the highest boiling point is the brine.

3.Evaporation, and there are solids left in the brine.

4.Put the two conductors into two liquids separately, and the one that can conduct electricity is salt water 5Take two liquids of the same mass, the smaller one is saline.

Take a small amount of reagent and drop it onto a clean and smooth glass piece, and observe whether there is any residue on the glass after the water evaporates, if there is, then the reagent is a salt solution, otherwise it is water.