The question on HCL Oh, junior high chemistry

m: Limestone and hydrochloric acid react to form carbon dioxide, which makes the clarified lime water turbid.

Medium n: cao+h2o===ca(oh)2

The calcium hydroxide (hydrated lime) produced by the reaction is slightly soluble in water, so there will be white cloudiness.

Standard Answer:

Hydrochloric acid drops into calcium carbonate to produce carbon dioxide, which reacts with clarified lime water to form calcium carbonate precipitate, so it is turbid. You were right.

Another drop of water into calcium oxide, the reaction releases a large amount of heat, the temperature increases, the solubility of calcium hydroxide decreases with the increase of temperature, lime water is originally saturated, the solubility decreases will lead to solute precipitation, and there will also be turbidity, but turbidity is solid calcium hydroxide.

I hate Haida, concise and accurate is best!

CO2 is produced in m, and calcium carbonate precipitates are formed in saturated lime water.

n In the second test tube, the water releases a lot of heat when it encounters quicklime, and the solubility of lime water decreases with the increase of temperature, so there is precipitation precipitation.

The temperature in both test tubes will increase, so that the temperature of the two bottles of saturated lime water will increase, and the solubility of calcium hydroxide will decrease with the increase of temperature, so they will become turbid.

(1) The particles (molecules, atoms, and ions) that make up a substance undergo a chemical change and become particles of other substances.

2) chemical change and physical change often occur at the same time, and in the process of chemical change, physical change must occur at the same time; In the process of physical change, chemical change does not necessarily occur.

3) Physical properties: color, state, odor, melting point, boiling point, hardness, density, solubility, volatility, ductility, thermal conductivity, adsorption.

Through chemical changes.

Not necessarily.

Odor State Conductivity Density Melting Point Boiling Point.

1) The particle molecules that make up the substance become the particles of other substances.

2) chemical change and physical change often occur at the same time, and in the process of chemical change, physical change always occurs; In the process of physical change, chemical change does not necessarily occur.

3) Physical properties: color, odor, density, state, conductivity, melting point, boiling point, solubility, volatility, ductility, thermal conductivity, adsorption.