What does the neutralizing value of liming materials indicate?
he liming materials are used to neutralize the soil acidity. The Ca present in the liming materials is responsible for this attribute.
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- The liming materials are used to neutralize the soil acidity. The Ca present in the liming materials is responsible for this attribute. The neutralizing value of a liming material is often compared with Ca-carbonate (CaCO3), the most commonly used liming material.
- The neutralizing value of a liming material is calculated as follow
(%Ca in the liming material/ %Ca in CaCO3) X 100
- For example, the neutralizing value of Ca(OH)2 is calculated as follow
%Ca in Ca(OH)2 = (mol. wt. of Ca/ mol. wt. of Ca(OH)2) X 100 = 54%
%Ca in CaCO3 = (mol. wt. of Ca/ mol. wt. of CaCO3) X 100 = 40%
- Therefore, neutralizing value of Ca(OH)2 is 54/40 X 100= 135%
- The 135% neutralizing value of Ca(OH)2 indicates 100 kg Ca(OH)2 is equivalent to 135 kg CaCO3 in neutralizing the acidity.
- It also means that the Ca(OH)2 requirement is (135-100)/135 X 100 = 26% less than the CaCO3 requirement
- CaCO3 requirement is (135-100)/100 X 100 = 35% more than the Ca(OH)2 requirement.
- The neutralizing value of other liming materials are:
Calcium magnesium carbonate = 108.5
Calcium oxide = 178.5
Calcium hydroxide = 135
Calcium silicate = 86
Sodium bicarbonate = 59.5
Quiz:
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Neutralising value of slaked lime is 135. What does it indicate?
Result:
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