The importance of sodium aluminate (III) in the treatment of water is to
cause coagulation
prevent goitre and tooth decay
neutralize acidity
kill germs
0
Explanation: In water treatment, sodium aluminate (\(\ce{NaAlO2}\)) is added as a coagulant. It helps to precipitate and remove fine suspended particles and colloidal impurities by neutralizing their charges, which causes them to clump together and settle out. It is not used to prevent goitre (iodine), neutralize acidity (lime or soda ash), or kill germs (chlorine).
Final Answer: cause coagulation
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