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. Define Elements and Compounds? Pure substances are categorized into two categories that are elements and compounds. An element is a substance that can't be separated into

Which electronic configuration is not observing the ( n+ 1) rule: (1) 1s 2 , 2s 2 , 2p 6 , 3s 2 , 3p 6 , 3d 1 , 4s 2                (2) 1s 2, sp 2 , sp 6 , 3s 2 , 3p 6 , 3

The uncertainty in momentum of an electron is 1 x10 -5 kg- m/s  . The uncertainty in its position will be (h= 6.62 x 10 -34 kg - m 2 / s): (1) 1.05 x 10- 28 m

Refer to diagram A, which describes the system formed by water-ethanol mixtures at 1 atm pressure, but is not drawn to scale.  Industrial ethanol production results in the lowest-b

If the velocity of hydrogen molecule is 5x 10 4 cm sec -1   then its de-Broglie wavelength is: (1) 2 Å    (2) 4 Å    (3) 8 Å    (4)100 Å Ans:  4 Å

Interval Scales An alternative approach is to rate liking on a proper interval scale or on a continuous line - scale, with only the ends  of the scale being labeled "  extreme

Q. Explain Ligand field theory? The bond approach, though not as perfect, is more useful. Here we do all the calculations based on crystal field theory. The differences between

Q. Explain Combined Gas Law? Ans. The  combined gas law  combines Boyle's law and Charles' law. The combined gas law describes situations where a gas undergoes simul

Physical Properties of benzene (a) First property of Benzene is that it is a colourless, mobile and volatile liquid. Its boiling point is 80°C and freezing point is 5.5°C. It c

Action of grignard reagents on carbonyl compounds with examples