Reaction equations in molecular and ionic form: NH4Cl + NaOH = Na2S + HCl = H2S + FeCl2 =

1.

NH4Cl + NaOH = NaCl + NH↑ + H2O.

NH41+  + Cl1- + Na1+ + OH1- = Na1+ + OH1- + NH↑ + H2O.

NH41+   + OH1- =  NH↑ + H2O.

2.

Na2S + 2HCl = 2NaCl + H2S↑

2Na1+ + S2- + 2H1+ + 2Сl1- = 2Na1+ + 2Cl1- + H2S↑

2H1++ S2-  = H2S↑

3.

H2S + FeCl2 = FeS↓ + 2HCl.

2H1+ + S2- + Fe2+ + 2Cl1- = FeS↓ + 2H1+ + 2Cl1-.

Fe2++ S2-   = FeS↓ .



One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.