Some plants require acidic soils for healthy growth. Which of the following could be added to soil around such plants to increase the acidity of the soil? 1.iron(ii)sulphate 2. sodium sulphate 3.aluminum sulphate 4.iron(iii)sulphate 5.caesium sulphate. Write Chemical equations to support your answers

Question

Some plants require acidic soils for healthy growth. Which of the following could be added to soil around such plants to increase the acidity of the soil?  1.iron(ii)sulphate 2. sodium sulphate 3.aluminum sulphate 4.iron(iii)sulphate 5.caesium sulphate. Write Chemical equations to support your answers

DrBob222 · Answer

Both iron and aluminum salts are used to make soil acidic (Sulfur is used also). For Al, the net reaction is

[Al(H2O)6]^3+ + H2O ==> [Al(H2O)5(OH)]^2+ + [H3O]^+
There is a second step and a third . The second is like this.
[Al(H2O)5(OH)]^2+ + H2O ==> [Al(H2O)4(OH)2]^+ + [H3O]^+
]
The third is likewise. Fe salts to the same but the ferric salts are more effective than the ferrous salts.