Question

The best coagulant for the precipitation of Fe(OH)3 sol is
(a) Na2HPO3
(b) NaNO3
(c) Na3PO4
(d) Na2SO4

Answer 1

Answer:

(c) Na₃PO₄

hope it helps....♥️

Answer 2

Answer: The correct answer is (c) Na₃PO₄.

Explaination: Na₃PO₄ contains phosphate group with highest negative charge  i.e..PO₄³⁻  and according to Hardy Schulz rule greater the no. of oppositively charged ion greater the precipitation and flocculation takes place.

So, as a electrolyte Na₃PO₄ which has 3⁻negative charge, being added as the best coagulant for the precipitation of Fe(OH)₃ which has 2⁺ positive charge.

Coagulation

• Coagulation is the process of causing suspended particles in a liquid to clump together and form larger particles called flocs.
• Coagulation is often used in water treatment to remove suspended solids and other contaminants from water and flocs can be removed by settling or filteration.
• The common coagulants used in the water filteration techniques are Aluminium sulfate and sodium aluminate.

To learn more about Coagulation, refer these links.

https://brainly.in/question/5567737

https://brainly.in/question/15384303

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