The sequential operation of preparing sulfuric acid solutions is:

First of all, according to the concentration of concentrated sulfuric acid and the concentration and volume of dilute sulfuric acid you want to prepare, calculate the volume of concentrated sulfuric acid required, and then measure the concentrated sulfuric acid with a graduated cylinder, and slowly add it to the beaker along the wall of the beaker containing a certain volume of distilled water, (because the dilution of concentrated sulfuric acid will release a lot of heat, and the density of concentrated sulfuric acid is greater than that of water, if you add water to concentrated sulfuric acid, it may cause boiling, which is very dangerous, so you should add concentrated sulfuric acid to water, and keep stirring) After dilution, wait to cool to room temperature, and drain the glass rod, Transfer to the volumetric flask, wash the beaker and glass rod 2-3 times, the washing liquid is also transferred to the volumetric flask, then add water to determine the volume, pay attention to the rubber head dropper when it reaches the scale of 1-2 cm, go to the concave liquid surface and tangent to the scale, cover the volumetric flask, shake well, pour the prepared solution into the reagent bottle, label it, and write the name and concentration of the prepared solution. That's it!

Configure a solution of a certain concentration: calculate, weigh, dissolve, pipette, wash, set volume, shake well.

Concentrated sulfuric acid is acid into water or something.

Acid into the water, otherwise it will splash!! It will be disfigured, one counts, two takes, three dissolves, four colds, five transfers, six takes, seven vibrations, eight determinations, nine shakes, and ten bottling.

Dilution is to be carried out in the beaker, pay attention to the concentrated sulfuric acid slowly added to the water, when diluted to a certain extent, then use a volumetric flask to determine the volume

To give you a simple, acid into the water, slowly flow, to stir, then ditto.

1. Measuring liquid: Concentrated sulfuric acid measured with 5ml measuring cylinder.

2. Dilution: Choose a clean beaker of appropriate size, first add about 20ml of distilled water (about 1 5 of the total volume of preparation), and then slowly pour the good amount of concentrated sulfuric acid into the water, stirring while pouring. Cool to room temperature.

3. Pipetting: Carefully pour the prepared concentrated sulfuric acid into the volumetric flask along the glass rod, wash the beaker and the glass bumper glass rod 2-3 times (about 15ml of distilled water each time), and inject the washing liquid into the volumetric flask along the glass rod each time. Shake and shake.

4. Constant volume: Inject distilled water into the volumetric flask along the glass rod with a beaker to 2-3cm below the engraving line, and use a rubber head dropper to add distilled water dropwise to the lowest part of the concave liquid surface and tangent to the engraved line (head-up). Shake again.

5. Transfer the prepared solution to the fine-mouth reagent bottle, and label it to indicate the type and concentration of the reagent.

Formulated concentrated sulfuric acid.

Precautions when solution:

1. The solution used in the analysis experiment should be prepared with pure water, and the container should be washed with pure water for more than three times.

2. The solution should be contained in a reagent bottle with a stopper.

3. The prepared reagent should be put into the reagent bottle in time, and the reagent bottle must be marked with the name, concentration and preparer, preparation date and expiration date.

4. Care should be taken not to deteriorate the solution when storing the solution.

5. Preparation of sulfuric acid, phosphoric acid and nitric acid.

When using hydrochloric acid or other solutions, the acid should be poured into water.

6. When preparing the solution with organic solvent (such as making indicator solution), it can be dissolved in a hot water bath, not directly heated.

7. You should be familiar with the preparation methods of some commonly used solutions and the properties of common reagents.

8. Do not directly contact the corrosive and highly toxic solution by hand, and the highly toxic waste liquid should be detoxified and not poured directly into the sewer.

The first thing to understand is that the most important thing to understand is the addition of sulfuric acid to the water. Don't do it the other way around, or you'll be in danger. Because sulfuric acid is exothermic when exposed to water, the density of water is less than that of sulfuric acid.

Secondly, we must do a good job of personal protective gloves and masks.

Proceed in a fume hood.

It refers to the dilution of concentrated sulfuric acid, pay attention to add concentrated sulfuric acid to water, and stir with a glass rod while adding.

Never add water to concentrated sulfuric acid, be sure to add sulfuric acid to the water slowly, stirring constantly.

The correct preparation method of dilute sulfuric acid solution is as follows:

Add water to the waste acid preparation tank first, and then slowly pour in 98% concentrated sulfuric acid until 50% to 60% dilute sulfuric acid is prepared.

The preparation of dilute sulfuric acid should pay attention to the following three points, whether it is 98% concentrated sulfuric acid or prepared dilute sulfuric acid, it is very corrosive, and 98% sulfuric acid also has strong water absorption, which will burn **. Therefore, it is necessary to wear labor protection equipment when operating.

Concentrated sulfuric acid will produce a lot of heat during the dilution process, so it is absolutely not allowed to pour water into concentrated sulfuric acid, but only concentrated sulfuric acid can be poured into water, and concentrated sulfuric acid can only be added to water slowly and slowly during operation.

Since the concentrated sulfuric acid dilution process is an intense exothermic process, the plastic products (pumps, pipes, etc.) in the preparation tank should be removed in advance to avoid thermal deformation and damage.

Sulfuric acid, the most important oxygenated acid of sulfur, anhydrous sulfuric acid is a colorless oily liquid crystallized at degrees Celsius, usually using its various concentrations of aqueous solutions, with the state crack tower method and contact method, the former is obtained as crude dilute sulfuric acid, the mass fraction is generally about 75 percent, and the latter can obtain pure concentrated sulfuric acid with a mass fraction of 10 percent, with a boiling point of 338 degrees Celsius.

Sulfuric acid is one of the most active binary inorganic strong acids, can react with many metals, high concentration of sulfuric acid has strong water absorption, can be used as a dehydrating agent, carbonized wood, paper, cotton and linen fabrics and biological skin and flesh and other carbohydrate-containing substances, when mixed with water, it will also release a large amount of heat energy, which has strong corrosiveness and oxidation.

Since concentrated sulfuric acid prepares dilute sulfuric acid, a large amount of heat is released during the dilution process, and the following matters need to be noted:

1. Slowly pour concentrated sulfuric acid along the wall of the cup, adding it slowly.

2. When pouring, stir with a glass rod while pouring.

3. Use a beaker or test tube for dilution, and do not use a series of measuring tool cups such as a graduated cylinder.

Concentrate the sulfuric acid slowly along the wall of the cup, and do not pour the water into the concentrated sulfuric acid, otherwise the water will boil and splash out, and a small amount of sulfuric acid will also come out, which will hurt people. Graduated cylinders cannot be used, graduated cylinders are just measuring tools.

Pour water into the beaker first, and then slowly pour the concentrated sulfuric acid down the walls of the beaker. Note that you must not add water to dilute concentrated sulfuric acid, because the density of water is small, and a large amount of exothermic water during the dilution process causes water droplets to splash and burn yourself, so be sure to add concentrated sulfuric acid to water!!

Add an appropriate amount of water to the beaker first, and then slowly pour the concentrated sulfuric acid along the wall of the cup, stirring with a glass rod while pouring, so that the heat is lost in time.

Pour concentrated sulfuric acid into the water, do not pour the water into the sulfuric acid, it will splash out, and the sulfuric acid should be poured slowly along the wall of the cup.

By the ratio you need; Water should be added first, then sulfuric acid, and sulfuric acid should be poured slowly along the inner wall of the container.

It should be noted that concentrated sulfuric acid should be slowly injected into the water along the glass rod, this order can not be wrong, and then the depth of the water and sulfuric acid ratio should be calculated, it should be these two points.

Be sure to pour concentrated sulfuric acid into the water slowly along the wall of the glass, and then stir thoroughly.

Sequence: Sulfuric acid is added to water.

Operation: Add slowly and shake while dripping to fully dissipate heat.

Constant volume: The volume can only be fixed when the temperature drops to room temperature.

Correct operation of concentrated sulfuric acid dilution, pay attention to safety!

It is prepared by slowly injecting 1 volume of concentrated sulfuric acid into 5 volumes of water.

Acid is added to the water, slowly, preferably with a guide rod.

1.Calculation: First, determine the amount concentration or mass percentage of the substance to be configured with dilute sulfuric acid, determine the amount of sulfuric acid required, and calculate the amount of concentrated sulfuric acid.

2.Measurement: Use a graduated cylinder with a suitable range to measure concentrated sulfuric acid.

3.Dilution: Concentrated sulfuric acid is slowly poured into water along the walls of the beaker, and the heat is dissipated by continuous stirring with glass rods during the process.

The above three steps are the basic steps, and there are the following steps if a certain amount of dilute sulfuric acid is accurately configured

4.Transfer: The diluted concentrated sulfuric acid is poured into a volumetric flask, the size of the volumetric flask is determined according to the need, and the process needs to be drained with a glass rod, and the solution must be completely cooled before transferring.

5.Washing: Wash the beaker 2 3 times with distilled water (generally with a washing flask) and transfer the washing solution to the volumetric flask.

6.Volume: Add distilled water to the volumetric flask to 2 3cm away from the scale mark, and use a rubber tip dropper to add dropwise until the lowest part of the concave liquid level is level with the scale mark. During volume setting, the line of sight should be kept in a horizontal position with the scale mark.

7.Shake well: Close the glass cap of the volumetric flask, drag the bottom of the bottle with the palm of your left hand, press the glass cap with the index finger of your right hand, and gently press the neck of the bottle with the other four fingers to shake it upside down.

After the above steps are completed, it can be used after standing.

Dilute sulfuric acid solution can be prepared using SO-containing flue gas, which includes the following steps:

1. The so-containing flue gas enters the cooling and dust removal device, and the temperature is reduced, in which the entrained solid impurities are removed;

2. The gas after cooling and dust removal in step 1 enters the hypergravity absorption device, and the absorbent hydrogen peroxide solution contacts the simple excitation in the hypergravity absorption device, so it enters the liquid phase to form a hydrogen peroxide mixed absorption liquid containing sulfuric acid, and the gas after desulfurization enters the defoaming device to remove the entrained absorption liquid, and is discharged from the chimney or goes to the downstream process, and the removed entrained absorption liquid returns to the hypergravity absorption device;

3. The absorbed rich liquid after desulfurization in step 2 enters the rich liquid storage tank, and the rich liquid in the rich liquid storage tank is circulated and absorbed through the rich liquid transfer pump and the flow regulating valve, and is recovered by the dilute sulfuric acid flow regulating valve when the concentration of dilute sulfuric acid in the rich liquid reaches the concentration of finger lead;

4. After the dilute sulfuric acid in step 3 reaches the specified concentration, it is produced by the dilute sulfuric acid flow regulating valve and enters the hypergravity reduction device, and the filler used in the hypergravity reduction device is loaded with hydrogen peroxide reduction catalyst, and under the action of the catalyst, the residual hydrogen peroxide in the produced dilute sulfuric acid is removed, and then collected or sent to the downstream process as a product;

5. There is a certain concentration of hydrogen peroxide stored in the hydrogen peroxide storage tank, and when the concentration of hydrogen peroxide is detected in the desulfurization absorption solution, the absorbent can be replenished in time through the hydrogen peroxide transfer pump and the hydrogen peroxide flow regulating valve.

Preparation steps for 50% sulfuric acid solution:

Prepare 1000 grams of 50% sulfuric acid solution with 98% concentrated sulfuric acid, and the mass of concentrated sulfuric acid required = 1000 * 50% 98% =; The quality of the water needs to be added = grams, and then the gram of concentrated sulfuric acid is added to the gram water, and the sulfuric acid solution with a concentration of 50% can be obtained by stirring evenly.

Sulfuric acid is used in the metallurgical industry and metal processing in the metallurgical industry sector, especially in the production process of non-ferrous metals. For some refining purposes, sulfuric acid is also needed to dissolve other metals that are not included. In the steel industry, iron oxides must be removed from the surface of steel with sulphuric acid before cold rolling, cold drawing and stamping.

It can also be used in the production process of petroleum products such as gasoline and lubricating oil in the petroleum industry, which requires concentrated pure sulfuric acid to remove sulfur-containing compounds and unsaturated hydrocarbons.

Sulfuric acid is one of the most reactive binary inorganic acids that reacts with most metals. Sulfuric acid is a colorless, transparent, odorless, oily liquid. High concentrations of sulfuric acid have strong water absorption.

When sulfuric acid is mixed with water, a large amount of heat energy is released. It is highly corrosive and oxidizing. When sulfuric acid reacts with metal, it releases flammable hydrogen, which may cause explosion, while concentrated sulfuric acid, which is a strong oxidizing agent, releases toxic sulfur dioxide when it undergoes redox reaction with metal.

The concentration of sulfuric acid solution is generally divided into 50% and 98%. <