Which kind of acid-base salt does

Magnesium hydroxide is basic in acid-base salts. It is hardly soluble in water, and the aqueous solution is weakly alkaline, but the part soluble in water is completely ionized.
Magnesium hydroxide (chemical formula: Mg (OH) 2) is the hydroxide of magnesium. It is a white crystal or powder and is difficult to dissolve in water. It is widely used as a flame retardant, antacid and stomach acid neutralizer.
It is also known as caustic magnesite, light burned magnesia, etc. the suspension of magnesium hydroxide in water is called magnesium hydroxide emulsion. Magnesium hydroxide is difficult to dissolve in water and alcohol, and soluble in dilute acid and ammonium salt solution. The aqueous solution is weakly alkaline. The solubility in water is very small, but the part dissolved in water is completely ionized.