FeCl3 and MgCl2 solution was prepared by dissolving FeCl3 (AR) and AlCl3 (AR) in distilled water. Secondly, under rapid stirring, NaHCO3 powder was slowly added to the above solution to the desired basicity (B = 1) which had been proved to be the optimal B for turbidity removal. Thirdly, Na2HPO4 (AR) was added to the PFMC solution as a stabilizer ([Na2HPO4]/([Fe] + [Mg]) = 0.08).

 

i. The the chemical equation of the Synthesis.

 

ii How much weight need to put NaHCO3 above solution the desired basicity (B=1)

 

iii. How much weight need to put Na2HPO4 on PFMC solution refering ([Na2HPO4]/([Fe] + [Mg]) = 0.08).