How to make clarified lime water and how to make clarified lime water proportion ?

You can find a few packets of food desiccant (the kind of white powder), dissolve it in water after opening, shake it well, let it stand, and take the supernatant after a period of time to clear lime water.

Because it is made with desiccant, lime water will certainly not be as pure as in the laboratory, and will be mixed with other solutes, but those impurities will not interfere with general chemical tests.

water and calcium hydroxide.

It is a clear solution of Ca(OH)2.

The solubility of Ca(OH)2 generated by CaO (that is, quicklime) dissolved in water is very small, so the lime water we often see is mixed, and the clarification is the result of filtration, and because the effect of clarified lime water is mainly to test the reaction products, if it is not clarified, even if the precipitation is generated, it cannot be seen, so the lime water mentioned in the book generally has to be clarified.

The usual preparation method of clarified lime water is: 30:1 according to the mass ratio, 30 grams of water and 1 gram of lime.

Lime emulsion is prepared in large quantities and then filtered or left to aspirate for a long time, which is time-consuming and cumbersome.

Take a small piece of quicklime and put it in a 250ml beaker, add about 100ml of distilled water, and stir it into lime emulsion after curing. Take a large beaker (500ml or 1000ml) filled with distilled water, and slowly pour the lime emulsion into the large beaker with constant stirring until the prepared liquid in the large beaker is slightly cloudy. Then pour an appropriate amount of distilled water into a large beaker until it is just clear.

So far, the preparation of the saturated solution of clarified lime water has been completed. This method saves time and effort, and can be used in the current system, which has strong practicability.

It is worth mentioning that the saturated clarified lime aqueous solution with distilled water as the solvent has a high ion concentration and strong reaction sensitivity, so the diluent can also be used in practical experiments, and its dilution degree is generally not more than 1 1. However, in the practice of experimental teaching, in order to facilitate and save costs, we often use tap water or natural water as solvents.

50 kg of clean water is required to prepare clarified lime water. kg of quicklime (ash block). First, put the quicklime into water to dissolve, stir, cool, and clarify (after removing the stones and other impurities, the same amount of lime is supplemented), and it is OK.

Hydrated lime is slightly soluble in water, and the solubility at room temperature is about grams of hydrated lime dissolved per 100 grams of water. Mix a small amount of hydrated lime with some water and filter it again.

The steps to make clarified lime water are as follows:1. Prepare the experimental equipment: two test tubes, test tube stoppers, long straws, goggles, calcium hydroxide, rubber tip droppers, medicine spoons, glass rods, test tube racks, funnels, filter paper, desiccant, two beakers (one of which contains half a cup of water).

2. Wear goggles.

3. Slowly put two spoonfuls of calcium hydroxide into the test tube.

4. Use the rubber tip dropper to suspend four drops of water into the test tube filled with calcium hydroxide.

5. Close the test tube plug tightly.

6. Pinch one-third away from the mouth of the test tube and shake it left and right, taking care not to oscillate up and down.

7. Shake the test tube until the liquid in the test tube turns into a milky white and turbid liquid.

8. Fold the filter paper in half twice and open it, with three layers on one side and one layer on each side.

9. Moisten the filter paper with dropper with water.

10. One end of the glass rod is attached to the third layer of filter paper and tilted to the first layer, and then the lime water is slowly poured into the funnel along the glass rod for filtration.

11. Wait for the filtration to be completed, and what comes out is the clarified lime water.

The steps to make clarified lime water are as follows:

1. Prepare experimental equipment: two test tubes, test tube stoppers, long straws, goggles, calcium hydroxide, rubber tip droppers, medicine spoons, glass rods, test tube racks, funnels, filter paper, and two beakers (one of which contains half a sock cup of water).

2. Wear goggles.

3. Slowly put two spoonfuls of calcium hydroxide into the test tube. (Note: When scooping calcium hydroxide into the tube, the tube needs to be placed horizontally).

4. Use the rubber tip dropper to suspend four drops of water into the test tube filled with calcium hydroxide. (Note: When using a dropper to drop water into a test tube, the dropper should be placed above the test tube and dripped into the water vertically down).

5. Close the test tube plug tightly.

6. Pinch one-third away from the mouth of the test tube and shake it left and right, taking care not to oscillate up and down.

7. Shake the test tube until the liquid in the test tube turns into a milky white and turbid liquid.

8. Fold the filter paper in half twice and open it, with three layers on one side and one layer on each side.

9. Moisten the filter paper with a dropper and add water to moisten the filter paper.

10. One end of the glass rod is attached to the third layer of impermeable filter paper and tilted to the first layer, and then the lime water is slowly poured into the funnel along the glass rod for filtration. (Note: Use a glass rod to roll out the air bubbles in the filter paper.) ）

11. Wait for the filtration to be completed, and what comes out is the clarified lime water.

<>1. Prepare some calcium oxide or calcium hydroxide.

2. Pour calcium oxide or calcium hydroxide into an Erlenmeyer flask, and then add an appropriate amount of water. **Dissolve calcium oxide or calcium hydroxide sufficiently.

3. After the remaining solids are precipitated, they are filtered, and the supernatant is the clarified lime water.

<> clarified lime water, that is, a clear aqueous solution of calcium hydroxide (commonly known as hydrated lime), is alkaline. Here's how to make it:

1. Remove the stopper of quicklime and use a spoon to put a small amount of quicklime solid beaker into it;

2. Add water to dissolve and stir with a glass rod;

3. Make a filter with filter paper, the filter paper should not exceed the edge of the funnel, and the filter paper should be attached to the inner wall of the funnel;

4. The liquid flows into the filter along the glass rod;

5. The liquid in the filter should not exceed the edge of the filter paper.

6. After filtration, remove the filter and put the filter paper into the waste tank;

7. Clean the instrument and tidy up the test bench.

Inject the oxalic acid solution until the precipitation appears, then stop, and remove the sodium alkali. Then enter the centrifuge and centrifuge at 800 turns.

The difference between slaked lime (hydrated lime) and clarified lime water.

Queahming lime is a solid, the main component is calcium hydroxide, and clarified lime water is a liquid, dissolving a trace amount of calcium hydroxide, in fact, they are the same substance, clarified lime water is a clear liquid of lime slurry.

Soda lime. It is often used as a desiccant, and the main components (can only be solids) are calcium chloride and sodium hydroxide, which are often placed in a drying tube to dry gases (only non-acidic gases, such as ammonia, hydrogen, oxygen, etc.).