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Anonymous users2024-02-111) Incorrect Analysis: After a sufficient amount of CO2 is introduced into the calcium hydroxide solution, a clear solution is obtained: 2CO2+Ca(OH)2 Ca(HCO3)2, which will not produce a white precipitate (2) Incorrect Analysis:
After a sufficient amount of CO2 is introduced, calcium hydroxide solution becomes calcium bicarbonate solution, sodium hydroxide solution becomes sodium bicarbonate solution, and the two substances generated are strong alkaline and weak salts, which will be hydrolyzed and alkaline, and more professional answers can contact Taicang Oriental Metallurgical Lime Products Factory, products and services: Taicang Oriental Metallurgical Lime Products Factory, with rich production experience, can provide various specifications of calcium products according to customer needs, and is now mainly producing calcium oxide and calcium hydroxide for environmental protection, chemical, food and other industries. The products are used in food additives, petroleum lubricants, fine chemicals, fillers, metallurgy, waste water and acid treatments
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Anonymous users2024-02-10No phenomenon. You should have made a mistake.
Carbon dioxide should be introduced into a saturated sodium carbonate solution.
The phenomenon is that there is precipitation of white crystals.
Na2CO3 + H2O + CO2 = 2NaHCO3 reacts to form sodium bicarbonate and the mass of sodium bicarbonate is greater than that of sodium carbonate, and water is consumed, and the solubility of sodium bicarbonate is smaller than that of sodium carbonate, so excess sodium bicarbonate is precipitated in the form of crystals.
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Anonymous users2024-02-09I think there should be precipitation.
1 carbonate 1 carbon dioxide 1 water 2 bicarbonate.
That is, sodium carbonate becomes sodium bicarbonate, and because the solubility of sodium carbonate is large, the solubility of sodium bicarbonate is small, so there will be precipitation
This is the chemical equation we learned last semester (Senior 1) and the properties of sodium carbonate and sodium bicarbonate
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Anonymous users2024-02-08If there is an overdose, there is.
Na2CO3 + CO2 (excess) + H2O = 2NaHCO3 has no obvious phenomenon!
Reason: Under the same conditions, the solubility of Na2CO3 is larger than that of NaHCO3, and Na2CO3--2NaHCO3, because Na2CO3 is a saturated solution, and 2 times of NaHCO3 is generated, so NaHCO3 crystals will be dissolved and precipitated.
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Anonymous users2024-02-07It can be seen that a white cloudiness is produced. Reactions that occur:
The reason for the precipitation of Na2CO3 + CO2 + H2O2 NaHCO3 is not that the sodium bicarbonate produced is insoluble in water, but because the sodium bicarbonate solution reaches saturation and the insoluble sodium bicarbonate precipitates.
From the chemical equation, it can be calculated that if 106 grams of sodium carbonate are involved in the reaction, 168 grams of sodium bicarbonate can be generated. Because the original solution is"Saturation"The reaction process consumes a portion of the water. At the same temperature, the solubility of sodium carbonate is greater than that of sodium bicarbonate, so the sodium bicarbonate produced cannot be completely dissolved.
There is precipitation.
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Anonymous users2024-02-06Mr. into sodium carbonate.
Because there is less CO2 at the beginning, the equation: CO2+2NaOH==NA2CO3+H2O
Continue to pass CO2 to generate NaHCO3, the equation: CO2 + Na2CO3 + H2O==2NaHCO3
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Anonymous users2024-02-05co2+h2o+na2co3==2nahco31.The reaction consumes water and the solvent decreases.
2.The solubility of sodium bicarbonate is less than that of sodium carbonate at the same temperature.
3.The mass of sodium bicarbonate produced is larger than that of sodium carbonate, so the excess sodium bicarbonate generated cannot be fully dissolved, and most of it is crystal precipitated.
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Anonymous users2024-02-04Excessive carbon dioxide is introduced to produce white crystals.
This is because the introduction of carbon dioxide produces sodium carbonate and sodium bicarbonate.
Sodium bicarbonate is less soluble than sodium carbonate.
When carbon dioxide is reintroduced into sodium carbonate, sodium bicarbonate is formed.
When there is an excess of carbon dioxide, sodium bicarbonate is precipitated.
Therefore, there is a precipitation of white crystals.
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Anonymous users2024-02-03The solution is cloudy or precipitates.
The chemical equation that occurs: Na Co + Co + H O = 2NaHCO
The reason for turbidity or precipitation is not that the sodium bicarbonate produced is insoluble in water, but because the sodium bicarbonate solution reaches saturation and the insoluble sodium bicarbonate precipitates.
Sodium carbonate is easily soluble in water and glycerol. 20 per 100 grams of water can dissolve 20 grams of sodium carbonate, when the solubility is the largest, 100 grams of water can be dissolved gram of sodium carbonate, slightly soluble in absolute ethanol, insoluble in propanol.
Sodium bicarbonate is a white crystal, or an opaque monoclinic fine crystal. Specific gravity. It is odorless, non-toxic, salty, soluble in water and slightly soluble in ethanol. Soluble in 10 parts of water at 25 o'clock, soluble in 12 parts water at about 18 o'clock.
Its aqueous solution is slightly alkaline due to hydrolysis, stable in nature at room temperature, easy to decompose when heated, gradually decomposes above 50, completely loses carbon dioxide at 270, has no change in dry air, and slowly deliquescent in humid air.
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Anonymous users2024-02-02It can be seen that a white cloudiness is produced. Reactions that occur:
na2co3 + co2 + h2o → 2 nahco3
The reason for the precipitation is not that the sodium bicarbonate produced is insoluble in water, but because the sodium bicarbonate solution reaches saturation and the insoluble sodium bicarbonate precipitates.
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Anonymous users2024-02-01The solution is cloudy or precipitates.
The ionic equation is: <>
When a small amount of clarified lime water is added, the ion equation is: >>>More
Go to a certain sample.
After dissolving, excess hydrochloric acid is added to collect the gas produced to calculate the mol amount. >>>More
Of course, the following methods are to measure the original mass in the sample, and then fully heat it to see how much the mass is reduced, and what is reduced is the H2O and CO2 released in 2NaHCO3=Na2CO3+H2O+CO2, so that the mass of NaHCO3 in it is known, and finally of course it must be converted into the original sample mass.
2.Preparation method:
1) Laboratory method: >>>More
Sodium carbonate (soda ash) The chemical formula is Na2CO3, commonly known as soda ash, also known as soda and soda ash, an important chemical basic raw material, and the main product of the soda ash industry. It is usually a white powder, easy to decompose at high temperatures, soluble in water, and the aqueous solution is alkaline. Soda ash will deliquescent in humid air, slowly absorb carbon dioxide and water, and partially become sodium bicarbonate, so the packaging should be strict, otherwise it will absorb moisture and agglomerate, sodium carbonate and water will form Na2CO3·10H2O, Na2CO3·7H2O, Na2CO3·H2O three kinds of hydrates, of which Na2CO3·10H2O is the most stable, and the heat of dissolution soluble in water is very small. >>>More