Chemical Engineering - Fertiliser Technology - Discussion


Reaction of dilute sulphuric acid with phosphate rock produces

[A]. phosphoric acid
[B]. superphosphate
[C]. triple superphosphate
[D]. gypsum

Answer: Option A


No answer description available for this question.

Rathi said: (Jun 28, 2014)  
Phosphoric acid is produced from fluorapatite, known as phosphate rock, 3Ca3(PO4)2.CaF2, by the addition of concentrated (93%) sulfuric acid in a series of well-stirred reactors.

Mahesh Konduri said: (Sep 25, 2014)  
So concentrated sulphuric acid (93-98%) is used in manufacture of phosphoric acid. Where as dilute sulphuric acid (62-70%) is used in manufacture of super phosphate.

Munindra said: (Oct 17, 2014)  
Phosphate rock Ca10(PO4)2F6 + 7H2SO4 gives 3CaH4(PO4)2 + 7CaSO4 + 2HF.

Here concentration of sulphuric acid is 55 to 75%.

It means super phosphate should be the other answer.

So according to me its a multiple answer question where A and B both are correct.

If I am wrong could some one clear my doubt.

Manish said: (Oct 9, 2015)  
Answer is given wrong. It should be B.

Phosphoric acid + Phosphate rock gives Trile superphosphate.

Sulfuric acid + Phosphate rock gives Superphosphate.

Ramesh Vishwakarma said: (Dec 7, 2016)  
Triple super phosphate is the right answer.

Vijaykumar said: (Jul 4, 2018)  
Phosphate rock with conc H2SO4 makes phosphoric acid but phosphate rock and Dil H2SO4 produce Super phosphate.

Ravi Gupta said: (Nov 19, 2018)  
No, Phosphate rock with dilute sulphuric acid produces superphosphate. For phosphoric acid con acid is used.

Ehsan Ahamad said: (Jun 3, 2020)  
Right answer is B.

Sulphuric acid + phosphate rock = superphosphate.

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