一道關(guān)于沉淀－溶解平衡的化學(xué)題
溶液中 [Br− ] = 0.020 mol L−1 , [CrO 2− ] = 0.0030 mol L−1,在溶液中逐次加入固體硝酸銀,問(wèn) Ag2CrO4(s)剛開(kāi)始沉淀時(shí) 的[Br− ]
英文原題是這樣的
8 In a particular solution, [Br− ] = 0.020 mol L−1 and
[CrO 2− ] = 0.0030 mol L−1. Finely-divided solid silver nitrate, AgNO3, is slowly added to the solution. What
is [Br− ] when Ag2CrO4(s) just begins to precipitate?






*A 2.1×10−8 mol L−1



B6.0×10−8 mol L−1



C2.7×10−7 mol L−1



D5.2×10−13 mol L−1



E6.4×10−4 mol L−1