When Xiao Ming travels, he bottles some mountain spring water and takes it back to the laboratory. Under the guidance of the teacher, he carried out experiments and distilled according to the followin

When Xiao Ming travels, he bottles some mountain spring water and takes it back to the laboratory. Under the guidance of the teacher, he carried out experiments and distilled according to the following procedures. (1) Use the colloid produced by dissolving alum in water to adsorb impurities and precipitate them, thus achieving the purpose of purifying water;

(2)D；

(3) adsorption;

(4) heating and boiling;

(5) Absorb sulfur dioxide to prevent air pollution; Prevent the high-temperature melt produced after combustion from splashing down the bottom of the bottle, causing the bottom of the bottle to burst; When exploring combustion conditions, put hot water in the beaker.