When mixing solutions of Al2 (SO4) 3 and Na2S, aluminum hydroxide Al (OH) 3 precipitates.

| March 23, 2021 | education

When mixing solutions of Al2 (SO4) 3 and Na2S, aluminum hydroxide Al (OH) 3 precipitates. Explain the reason and give the corresponding reaction equations.

As a result of mixing solutions of aluminum sulfate Al2 (SO4) 3 and sodium sulfide Na2S, it can be assumed that a precipitate will form in the form of aluminum sulfide Al2S3. However, aluminum hydroxide Al (OH) 3 precipitates. This behavior of the reaction is justified by the hydrolysis of both Al2 (SO4) 3 and Na2S occurring in the solution, which is mutually reinforced. Molecular equation: Al2 (SO4) 3 + 3Na2S + 6H2O => 2Al (OH) 3 ↓ + 3H2S ↑ + Na2SO4; Full ionic equation: 2Al (3+) + 3SO4 (2-) + 6Na (+) + 3S (2-) + 6H2O => 2Al (OH) 3 ↓ + 3H2S ↑ + 6Na (+) + 3SO4 (2-) ; Short ionic equation: 2Al (3+) + 3S (2-) + 6H2O => 2Al (OH) 3 ↓ + 3H2S ↑.



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