【单选题】Auro Construction (AC) builds electricity generation plants. Look at the Executive summaryof the Strategy Briefing Document and decide which change the company is considering.
【简答题】称取制造油漆的填料红丹(Pb 3 O 4 )0.1000g,用盐酸溶解。在热时加入25mL浓度为0.02mol·L -1 的K 2 Cr 2 O 7 溶液,析出PbCrO 4 : 冷却后过滤,将PbCrO 4 沉淀用HCl溶解。加入KI和淀粉溶液,用0.1000mol·L -1 Na 2 S 2 O 3 溶液滴定至终点时,用去12.00mL。求试样中Pb304的质量分数。[M(Pb 3 O 4 )...
【简答题】称取制造油漆的填料红丹(Pb 3 O 4 )0.1000g,用盐酸溶解。在热时加入25mL浓度为0.02mol·L -1 的K 2 Cr 2 O 7 溶液,析出PbCrO 4 : 冷却后过滤,将PbCrO 4 沉淀用HCl溶解。加入KI和淀粉溶液,用0.1000mol·L -1 Na 2 S 2 O 3 溶液滴定至终点时,用去12.00mL。求试样中Pb304的质量分数。[M(Pb 3 O 4 )...