【简答题】![](https://cos-cdn.shuashuati.com/shuashuati-web/2024-0521-0905-00/logo-new-ad743.png)
仅含有惰性杂质的铅丹(Pb3O4)试样为3.500g,定量加入的Fe2+标准溶液和足量的稀H2SO4以溶解试样,滴定过量的Fe2+需3.05mL 0.04000mol/L KMnO4标准溶液。同量的Fe2+标准溶液,在酸性介质中用0.04000mol/L KMnO4的标准溶液滴定时,需要用去48.05mL。试计算铅丹中Pb3O4的质量分数。[Mr(Pb3O4)=685.6]
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAYAAABzenr0AAAA5ElEQVRYR2NkGGDAOMD2M+B0wKpVq9huv/jbxPD/fxwDA4MkhQ59zsDIuEhVgrkuLCzsF7JZOB3QOml5B8P//+UUWoyqnZGxszovsoI4B0xc9gyfzxmZmb2rcsK3IRvWMWm599///7fgcfTz6vwoKWId8B+f75kZGX0q8iK3kugAhur8KJRQxx0FE5fhdQC5UTPqgNEQGA2B0RAYDYHREBgNgaETAuTW96TqG7yt4tbRFhGRIQBqHTP9+8dIoDUMTxqk5AK8zXKYiaDWMYhNpANIaJYPdMdkwLtmpOZnctUPeDkAAP6tmiH1ggTLAAAAAElFTkSuQmCC)
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