某校化学课外活动小组在一次活动中,取刚降到地面的雨水水样,每

某校化学课外活动小组在一次活动中,取刚降到地面的雨水水样,每隔5分钟用pH计测定一次pH,其数据如下表:
测定时刻
6︰05
6︰10
6︰15
6︰20
6︰25
6︰30
p H
4.95
4.94
4.94
4.88
4.86
4.85
已知:正常雨水的pH约为5.6,酸雨的pH小于5.6。
(1)所取的雨水是否为酸雨?           (填“是”或“否”);在测定的期间,雨水水样的酸性随着时间的变化逐渐             (填“增强”或“减弱”)。
(2)经调查,这一地区有一座燃煤发电厂(生产过程中产生SO2),某同学设计用火碱来吸收生产过程中产生的SO2,将其转化成亚硫酸钠(Na2SO3)。请你帮他写出该反应的化学方程式:                                。
(3)若用pH试纸测定雨水的酸碱度,测定方法是:                   。

答案

⑴是、增强;
⑵2NaOH +CO2==Na2CO3+H2O
⑶将PH试纸放在玻璃片上,用玻璃棒蘸雨水滴在PH试纸上,将PH试纸显示的颜色与标准比色卡对照读出PH值。解析:

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