Question

explain using chemical reactions why aluminium ions act as an indirect source of hydrogen ions and a source of soil acidity

Answer 1

Explanation:

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Answer 2

Answer:

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Explanation:

Liming Soils

Soil acidity is neutralized by liming soils. Details on liming materials and liming practices can be found in Adams (1984). The general reaction that explains the interaction of a liming material such as CaCO3 with water to form OH−ions is (Thomas and Hargrove, 1984)

(9.7)CaCO3+H2O→Ca2++HCO3-+OH-.

The OH− reacts with indigenous H+ or H+ formed from the hydrolysis of Al3+. The overall reaction of lime with an acid soil can be expressed as

(9.8)2Al-soil+3CaCO3+3H2O→3Ca-soil+2Al(OH)3+3CO2.

One sees that the products are exchangeable Ca2+ and Al(OH)3. Assuming that all of the acidity was completely neutralized one would find that the soil pH would be 8.3 and the soil would be completely saturated. However, usually one wishes to lime to a lower pH so that only exchangeable acidity is completely neutralized. However, there is still titratable acidity (the total acidity in a soil at a particular pH such as 8.2) ascribable to weak forms of acidity such as hydroxy-Al and hydroxy-Fe species and functional groups of SOM and clay minerals that are not deprotonated.

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