探究红热铜丝伸入稀硫酸时产生的“意外”现象

Explore the Accidental Phenomena of Glowing Copper Wire into Dilute Sulphuric Acid

对红热铜丝伸入稀硫酸时产生的"意外"现象进行了实验探究,研究后得出的结论为:稀硫酸局部受高热使硫酸分子逸出形成白雾。铜在高温加热时产生氧化铜和氧化亚铜,氧化铜迅速溶于稀硫酸生成硫酸铜,由于硫酸铜的量少,所得的混浊液在短时内不易观察到蓝色;氧化亚铜则脱落在溶液中,但由于硫酸分子逸出、氧化铜消耗硫酸等因素导致硫酸浓度下降,从而使氧化亚铜的溶解速率减慢,所以砖红色的混浊物为氧化亚铜且能暂时存在。

By means of the studying on the accidental phenomena when the glowing copper wire was put into the dilute sulphuric acid,this paper found the causes of the accidental phenomena:(1)The H2SO4molecule was escaping and forming the white fog when the dilute sulphuric acid was scorching heated partly;(2)The CuO and Cu2O came from the Cu scorching heated;(3)The CuO was dissolved in the dilute sulphuric acid rapidly and the copper sulphate was produced,but the muddy liquid was hardly observed the blue color in a short time,because the quantity of copper sulphate was very little;(4)The Cu2O was dropped in the dilute sulphuric acid,but its dissolving speed slew down,because the concentration of sulfuric acid decreased due to the escape of sulfuric acid molecules and the consumption of sulfuric acid by CuO,so Cu2O could exist in the dilute sulphuric acid momentarily.