Phosphate conditioning, Chemistry

Assignment Help:

Q. Write phosphate conditioning method for water softening with suitable chemical reactions. How it is different from soda lime method.

Ans. 

Phosphate conditioning: In high pressure boilers, scale formation can be avoided by adding sodium phosphate, which reacts with hardness causing substance of water, forming non adherent and easily removable soft sludge of calcium and magnesium phosphates, which can be removed by blow down operation.

 

3MCl2 + 2Na3PO4 = M3 (PO4)2 + 6NaCl

 

Where   M = Ca+2 or Mg+2

Mainly employed phosphates are:

1.      Sodium dehydrogenate phosphate (acidic) Na2HPO4

2.      Disodium hydrogen phosphate (weakly acidic)  Na2HPO4

3.      Trisodium hydrogen phosphate (alkaline) Na3PO4.

Difference between phosphate conditioning and Lime-Soda method

 

Phosphate conditioning

Lime-soda process

1

This is internal treatment method.

This is external treatment method.

2

It just supplements the L-S process and is not meant to replace L-S.

It has its own importance and is meant that it is necessary.

3

In this appropriate sodium phosphates are added.

Calculated amount of L and S is added.


Related Discussions:- Phosphate conditioning

Gas laws , what is the volume of a gas when the temperature is raised to 25...

what is the volume of a gas when the temperature is raised to 25 degrees celcius fro STP?

Platinum crystal structure, 1.  Consider a platinum crystal structure (FCC,...

1.  Consider a platinum crystal structure (FCC, R Pt = .139 nm). a.  Sketch the (100), (110), and (111) planes (including the atoms in the second layer if they can be observed

Introduction to nitrogen, Q.Briefly describe about Nitrogen? Ans. ...

Q.Briefly describe about Nitrogen? Ans. Nitrogen is a gas that makes up approximately 79% of the atmosphere. It exists in the form of the diatomic molecule N 2 . In this f

Normality, I don''t understand the concept of normality and gram equivalent...

I don''t understand the concept of normality and gram equivalent

Organic compound, diversity and magnitude of organic compound???

diversity and magnitude of organic compound???

Explain about frequency of electromagnetic waves, Q. Explain about frequenc...

Q. Explain about frequency of Electromagnetic waves? Electromagnetic waves all along with water waves and sound waves exhibit certain common characteristics. All waves consist

What is the purpose of zone refining, What is the purpose of zone refining?...

What is the purpose of zone refining? In a binary phase diagram (pressure omitted), what is the maximum number of phases which can coexist for at least one degree of freedom?

How is aniline obtained from benzene, (a) How is aniline obtained from benz...

(a) How is aniline obtained from benzene? (b) Why are the secondary amines more basic than primary amines? Describe. (c) Write the complete chemical reactions for the convers

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd