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例1小婧同学做硫在氧气中燃烧的实验前．预先在集气瓶装有少量水．实验过程中她联想到SO2排放到空气中会形成酸雨,于是想了解硫燃烧后集气瓶底部残留的“水”是否呈酸性．她多次取“水”测其pH,发现“水”的pH始终小于7并逐渐减小,直到稳定在pH=4．证明集气瓶底部残留液呈＿＿性．小婧想进一步了解该残留液是否具有酸的通性．请你与
Example 1 The students of Xiaoxuan made sulphur burning in oxygen before the experiment. Pre-loaded with a small amount of water in the gas cylinder. During the experiment, she thought that the emission of SO2 into the air would cause acid rain, so I wanted to know whether the “water” left at the bottom of the cylinder after the sulfur combustion was acidic. She repeatedly took “water” to measure its pH and found that the pH of “water” was always less than 7 and gradually decreased until stable at pH = 4. Prove that the residual liquid at the bottom of the cylinder is __. Xiao Yu wants to know more about whether the residual liquid has the acidity. Please and