Question

Triple superphosphate of lime is:
A) $3Ca{{({{H}_{2}}P{{O}_{4}})}_{2}}$
B) $Ca(HP{{O}_{4}})$
C) $2Ca{{({{H}_{2}}P{{O}_{4}})}_{2}}$
D) $C{{a}_{3}}{{(P{{O}_{4}})}_{2}}$

Answer 1

. We should know that Triple superphosphate (TSP) is a phosphorus (P) fertilizer that is used to restore soil components essential for farming. It is the principal carrier of phosphate, the form of phosphorus usable by plants, and is one of the world's most important fertilizers.

Complete step by step answer:
Before answering this, let us discuss TSP.
Triple Super Phosphate (TSP) of lime is used in fertilizer. It is composed of inorganic nutrients that are used to restore soil components essential for farming. The percentage of ${{P}_{2}}{{O}_{5}}$ (Phosphate) is around 44-46%.
We can produce TSP by using the specific phosphate acids and salts. The raw materials that are required in producing triple superphosphate are: Phosphate rock, Phosphoric acid and calcium fluoride.
We can write the reaction as-
$Ca{{F}_{2}}+3C{{a}_{3}}{{(P{{O}_{4}})}_{2}}+14{{H}_{3}}P{{O}_{4}}\to 10Ca{{({{H}_{2}}P{{O}_{4}})}_{2}}+2HF$

Further, when we react calcium fluoride with phosphate rock and phosphoric acid, it will produce superphosphate of lime.
The formula of triple superphosphate of lime is $2Ca{{({{H}_{2}}P{{O}_{4}})}_{2}}$
We should know that Triple Super Phosphate (TSP) of lime is a compound produced by treating rock phosphate with sulphuric acid or phosphoric acid, or a mixture of the two.
There are different varieties of super phosphates available. Ordinary superphosphate contains about 20% available phosphates; double superphosphate (also called treble superphosphate) contains 40%–50% available phosphate.
So, from the above discussion we can see that triple superphosphate of lime is $2Ca{{({{H}_{2}}P{{O}_{4}})}_{2}}$
So, the correct answer is “Option C”.

Note: It is important to note that Nitrate-based products are the least acidifying of the nitrogen fertilizers, while ammonium-based products have the greatest potential to acidify soil. We should note that phosphoric acid is the most acidifying phosphorus fertilizer. However, even nitrogen based fertilizers do more harm to the environment rather than serving the purpose of supporting plant growth.