Nguyễn Trần Hoàng Thương

$$a,\\ \text{acid: }H_2SO_4, H_3PO_4, HCl, CH_3COOH \\ \text{base: }Al(OH)_3, NaOH, Ba(OH)_2, Ca(OH)_2 \\ \text{oxide: }CO_2 , CaO, Fe_3O_4 \\ b, \\ Al(OH)_3: \text{ Aluminium hydroxide} \\ H_2SO_4: \text{ Sulfuric acid} \\ NaOH: \text{ Sodium hydroxide} \\ Ba(OH)_2: \text{ Barium hydroxide} \\ H_3PO_4: \text{ Phosphoric acid}\\ CO_2: \text{ Carbon dioxide} \\ Ca(OH)_2: \text{ Calcium hydroxide} \\ CaO: \text{ Calcium oxide } \\ HCl: \text{ Acid hydrochloric} \\ Fe(OH)_3: \text{ Iron(III) hydroxide} \\ CH_3COOH: \text{ Acetic acid} \\ Fe_3O_4: \text{ Iron (II,III) oxide}$$

$$c,$$

+ Làm quỳ tím đổi sang màu xanh: $$Al(OH)_3, NaOH, Ba(OH)_2, Ca(OH)_2$$

+ Làm quỳ tím đổi sang màu đỏ: $$H_2SO_4, H_3PO_4, HCl, CH_3COOH $$