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硫酸或鹽酸均不與金發(fā)生反應(yīng)，堿對(duì)金也無(wú)顯著侵蝕作用。
金可以溶解于下列溶液中:王水溶液、硫脲溶液、堿金屬氰化物溶液、I2-I-溶液、 Br2-Br 溶液、Cl-CI 溶液、硫代硫酸鹽溶液、亞砜基氯化物溶液、石灰硫黃合劑、鐵鹽存在下的混酸、堿金屬氯化物存在下的鉻酸以及含有Fe+的鹽酸等溶液。其中，王水溶解金的速度最快。作為貴金屬，金最重要的特征是化學(xué)活性低。在空氣中，即使在潮濕的環(huán)境下金也不起變化，故古代的金制品可保存到今天。在高溫下，金也不與氫、氧、氮、硫和碳反應(yīng)。金和臭在室溫下可起反應(yīng)，而和氟、氧、碘要在加熱下才反應(yīng)。
金在水溶液中的電極電位很高:
因此，無(wú)論在減中還是在硫酸、硝酸、鹽酸.氫氟酸以及有機(jī)酸中，金都不溶解。
在有強(qiáng)氧化劑存在時(shí)，金能溶解于某些無(wú)機(jī)酸中，如碘酸(HsIO;)、硝酸。有二氧化錳存在時(shí)金溶于濃硫酸，金也溶于加熱的無(wú)水硒酸(H2SeO4) (非常強(qiáng)的氧化劑)中。
金易溶于王水、飽和有氧氣的鹽酸、含有氧的堿金屬和堿土金屬的氰化物水溶液中。渣漿泵廠家
含Fe3+的硫脲酸性水溶液也是金的很好溶劑。此外，可溶解金的其他溶劑還有氯水、溴水、溶有KI或HI的碘液等。在所有場(chǎng)合下，金溶解都是形成相應(yīng)的配合物，而不是以Aut或Au3+這樣的簡(jiǎn)單離子出現(xiàn)。
Sulfuric acid or hydrochloric acid did not react with gold, and alkali had no significant effect on gold.
Gold can be dissolved in the following solutions: aqua regia solution, thiourea solution, alkali metal cyanide solution, i2-i-solution, Br2 br solution, CL CI solution, thiosulfate solution, sulfoxide chloride solution, lime sulfur mixture, mixed acid in the presence of iron salt, chromic acid in the presence of alkali metal chloride and hydrochloric acid containing Fe +. Among them, aqua regia dissolves gold the fastest. As a precious metal, the most important characteristic of gold is its low chemical activity. In the air, even in the humid environment, gold does not change, so ancient gold products can be preserved to today. At high temperature, gold does not react with hydrogen, oxygen, nitrogen, sulfur and carbon. Gold and stink react at room temperature, while fluorine, oxygen and iodine react only when heated.
The electrode potential of gold in aqueous solution is very high
Therefore, gold is insoluble in sulfuric acid, nitric acid, hydrochloric acid, hydrofluoric acid and organic acid.
In the presence of strong oxidants, gold can be dissolved in some inorganic acids, such as iodate (hsio;), nitric acid. In the presence of manganese dioxide, gold is soluble in concentrated sulfuric acid, and also in heated anhydrous selenic acid (H2SeO4) (a very strong oxidant).
Gold is easily soluble in aqua regia, hydrochloric acid saturated with oxygen, cyanide aqueous solution of alkali metal and alkaline earth metal containing oxygen. Slurry pump manufacturer
The thiourea acid solution containing Fe3 + is also a good solvent for gold. In addition, other dissolvable gold solvents include chlorine water, bromine water, iodine solution with KI or Hi, etc. In all cases, the dissolution of gold is to form corresponding complexes instead of simple ions such as aut or Au3 +.
