__________ (5% on wood) is used usually after the addition of magnesium ion. The mechanism for inactivating the ions by __________ precipitating the ions, but, strictly speaking, it is not a chelating agent.

__________ (5% on wood) is used usually after the addition of magnesiu

1.	__________ (5% on wood) is used usually after the addition of magnesium ion. The mechanism for inactivating the ions by __________ precipitating the ions, but, strictly speaking, it is not a chelating agent.
A.	tSodium disulfate
B.	tSodium peroxide
C.	tSodium silicate
D.	tSodium hydroxide
Answer» D. tSodium hydroxide