What is “milk of magnesia” chemically?

What is “milk of magnesia” chemically? 

(1) Magnesium carbonate 

(2) Sodium bicarbonate 

(3) Calcium hydroxide 

(4) Magnesium hydroxide 

Answer: (4) Magnesium hydroxide is an inorganic compound with the chemical formula Mg (OH)2. As a suspension in water, it is often called Milk of magnesia because of its milk-like appearance. The solid mineral form of magnesium hydroxide is known as brucite. Magnesium hydroxide is a common component of antacids and laxatives; it interferes with the absorption of folic acid and iron. Magnesium hydroxide has low solubility in water, with a Ksp of 1.5×10–11; however, all of the magnesium hydroxides that do dissolve dissociates. 

What is “milk of magnesia” chemically?   (1) Magnesium carbonate   (2) Sodium bicarbonate   (3) Calcium hydroxide   (4) Magnesium hydroxide

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