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

Define rutherford's experiment, Ernest Rutherford in 1909 conducted what is...

Ernest Rutherford in 1909 conducted what is now a famous experiment where he bombarded gold foil with alpha particles (Helium nuclei). A source which undergoes for alpha decay is

An e - has magnetic quantum number, An e - has magnetic quantum number as 3...

An e - has magnetic quantum number as 3, what is its principal quantum number: (1) 1        (2) 2    (3) 3            (4) 4 Ans: 4

Hypothesis and theory or theory and law, 1.  Define or explain the followin...

1.  Define or explain the following terms: a.  Science b.  Experimentation c.  Scientific method d. Hypothesis e. Theory f.  Scientific law g. Chemistry h.

Example on crystal field splitting in octahedral complexes, Q. Example on C...

Q. Example on Crystal field splitting in octahedral complexes? Here four ligands lie in one plane and the other two in a plane perpendicular to the first plane. Six ligands are

Oxidation and reduction, Which of the following reduces the activation ener...

Which of the following reduces the activation energy of a chemical reaction?

Classification of polymers, Classification of polymers Classification l...

Classification of polymers Classification lies on source of availability: They are categorized as (a) Natural polymers   (b) Synthetic polymers

Salt, what is the name of the precipitate and the formulae of the precipita...

what is the name of the precipitate and the formulae of the precipitate of NH3 (aq) and Pb(NO3)2 (aq)

Classification of dyes - direct dyes, Classification of dyes according to t...

Classification of dyes according to their application Direct dyes: this type of dyes can be directly applied to the fiber, both vegetable and animal, by dipping in hot aqueo

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