Sodium aluminates is a better coagulates then alum, Chemistry

Q. why is sodium aluminates is a better coagulates then ferrous sulphates or alum?

Ans. Sodium aluminates (NaAlO2): It is better coagulant than FeSO4 and alum because it easily hydrolyzes.

                     2NaAlO2 + 2H2O =2NaOH + Al (OH2)3

Sodium hydroxide formed as per the above reaction precipitates Mg+2 salts.

MgCl2 + 2NaOH = Mg (OH) 2 + 2NaCl

Both Al (OH) 3 and Mg (OH)3 are flocculent precipitates and they easily trap any finely suspended and colloidal impurities such as silica and oil.

 

 

Posted Date: 7/21/2012 7:16:23 AM | Location : United States







Related Discussions:- Sodium aluminates is a better coagulates then alum, Assignment Help, Ask Question on Sodium aluminates is a better coagulates then alum, Get Answer, Expert's Help, Sodium aluminates is a better coagulates then alum Discussions

Write discussion on Sodium aluminates is a better coagulates then alum
Your posts are moderated
Related Questions
Q. What are the Physical Properties of Halogens? Ans. The halogens exist as  diatomic  molecules held together by a single bond. Reactivity becomes less as you move down

H2,Li2,B2 each has bond order equal to 1 , the order of stability is

Why alcoholic acidity express in terms of sulphuric acid

I want questions for numericals on lime soda process

a) Describe why not all of the organic matter in wastewater is converted to carbon dioxide and water in biological treatment. b) What is the importance of the BOD in the charact

How do i find the concentration of Cl- ion in 0.60 M AlCl3 solution?

Q. Illustrate Crystal Field Theory with s-orbitals? Let us start with s-orbitals which are spherically symmetrical. Any effect due to mutual repulsions between the s-electrons

Calculate the pressures required to achieve a density of 220 g dm -3 , 330 g dm -3 , and 440 g dm -3 at temperatures of 305 K and 350 K.   Properties, like the solvent powe

Question: Does the number of steps in a reaction process affect the enthalpy change of the overall reaction? Hypothesis: To compare experimental data to functionality of He

what are the failure of octate rule