Question

 "Смешивают попарно растворы: Сu(NO3)2 и Na2SO4 , BaCl2 и K2SO4 , NaHSO3 и NaOH, Cu(OH)2 и HCl в каких из приведенных случаев реакции практически пойдут до конца? составьте для этих реакции молекулярные и ионно-молекулярные уравнения" Заранее спасибо

Answer 1

BaCl2 + K2SO4 = BaSO4 + 2KCl

Ba(+2) + 2Cl(-) + 2K(+) + SO4(-2) = BaSO4 + 2K(+) + 2Cl(-)

Ba(+2) + SO4(-2) = BaSO4

Cu(OH)2 + 2HCl = CuCl2 +2 H2O

Cu(OH)2 + 2H(+) + 2Cl(-) = Cu(+2) + 2Cl(-) + 2H2O

Cu(OH)2 + 2H(+) = Cu(+2) + 2H2O

Answer 2

#### Reaction between Cu(NO3)2 and Na2SO4 When Cu(NO3)2 and Na2SO4 are mixed, a reaction occurs. The balanced molecular equation for this reaction is: Cu(NO3)2 + Na2SO4 -> CuSO4 + 2NaNO3 In this reaction, copper(II) sulfate (CuSO4) and sodium nitrate (NaNO3) are formed. The reaction proceeds to completion because both copper(II) sulfate and sodium nitrate are soluble in water, meaning they dissociate into ions. Therefore, the reaction can be represented by the following ionic equation: Cu^2+(aq) + 2NO3^-(aq) + 2Na^+(aq) + SO4^2-(aq) -> CuSO4(aq) + 2Na^+(aq) + 2NO3^-(aq) #### Reaction between BaCl2 and K2SO4 When BaCl2 and K2SO4 are mixed, a reaction occurs. The balanced molecular equation for this reaction is: BaCl2 + K2SO4 -> BaSO4 + 2KCl In this reaction, barium sulfate (BaSO4) and potassium chloride (KCl) are formed. The reaction proceeds to completion because both barium sulfate and potassium chloride are insoluble in water. Therefore, the reaction can be represented by the following ionic equation: Ba^2+(aq) + 2Cl^-(aq) + 2K^+(aq) + SO4^2-(aq) -> BaSO4(s) + 2K^+(aq) + 2Cl^-(aq) #### Reaction between NaHSO3 and NaOH When NaHSO3 and NaOH are mixed, a reaction occurs. The balanced molecular equation for this reaction is: NaHSO3 + NaOH -> Na2SO3 + H2O In this reaction, sodium sulfite (Na2SO3) and water (H2O) are formed. The reaction proceeds to completion because both sodium sulfite and water are soluble in water, meaning they dissociate into ions. Therefore, the reaction can be represented by the following ionic equation: Na^+(aq) + HSO3^-(aq) + Na^+(aq) + OH^-(aq) -> Na2SO3(aq) + H2O(l) #### Reaction between Cu(OH)2 and HCl When Cu(OH)2 and HCl are mixed, a reaction occurs. The balanced molecular equation for this reaction is: Cu(OH)2 + 2HCl -> CuCl2 + 2H2O In this reaction, copper(II) chloride (CuCl2) and water (H2O) are formed. The reaction proceeds to completion because both copper(II) chloride and water are soluble in water, meaning they dissociate into ions. Therefore, the reaction can be represented by the following ionic equation: Cu(OH)2(s) + 2H^+(aq) + 2Cl^-(aq) -> CuCl2(aq) + 2H2O(l) Please note that the above equations are balanced molecular equations and ionic equations, representing the reactions between the given compounds.