Question

Помогите с химией,9 класс С помощью каких реакций можно осуществить следующие превращения: CaCO3 - А - Ca(OH)2 - Ca(NO3)2 - Б - CaCl2

Answer 1

Caco3+h2so4=>caso4+h2co3
caso4+2naoh=>ca(oh)2+na2so4
ca(oh)2+2kno3=>ca(no3)2+koh
ca(no3)2+2hbr=>cabr2+h2no3
cabr2+2hcl=>cacl2+2hbr

Answer 2

Chemical Reactions for the Given Transformations

To achieve the transformations from CaCO3 to Ca(OH)2, Ca(NO3)2, and CaCl2, we can use the following chemical reactions:

1. CaCO3 to CaO (quicklime): - The first step is to convert CaCO3 to CaO (quicklime) through thermal decomposition. - The chemical equation for this reaction is: ``` CaCO3(s) -> CaO(s) + CO2(g) ```

2. CaO to Ca(OH)2 (slaked lime): - The next step involves the reaction of CaO with water to produce Ca(OH)2 (slaked lime). - The chemical equation for this reaction is: ``` CaO(s) + H2O(l) -> Ca(OH)2(aq) ```

3. Ca(OH)2 to Ca(NO3)2: - To obtain Ca(NO3)2, we need to react Ca(OH)2 with nitric acid (HNO3). - The chemical equation for this reaction is: ``` Ca(OH)2(aq) + 2HNO3(aq) -> Ca(NO3)2(aq) + 2H2O(l) ```

4. Ca(OH)2 to CaCl2: - Finally, to produce CaCl2, we can react Ca(OH)2 with hydrochloric acid (HCl). - The chemical equation for this reaction is: ``` Ca(OH)2(aq) + 2HCl(aq) -> CaCl2(aq) + 2H2O(l) ```

These reactions demonstrate the chemical transformations from CaCO3 to Ca(OH)2, Ca(NO3)2, and CaCl2.