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滴定Titration 反应方程式3Na 2 S 2 O 3 +K 2 Cr 2 O 7 +6HCl→2Cr(OH)SO 4 +4NaCl+3S+Na 2 SO 4 +2KClReaction equation 3Na 2 S 2 O 3 +K 2 Cr 2 O 7 +6HCl→2Cr(OH)SO 4 +4NaCl+3S+Na 2 SO 4 +2KCl 1g碘化钾(KI)和5mL水被加入250mL碘量瓶中，该瓶中已加入15.00mLK 2 Cr 2 O 7 标准溶液和5mL盐酸(体积比为11)至该烧瓶。将该烧瓶封闭，使溶液混合充分并在黑暗处静置5分钟。用Na 2 S 2 O 3 溶液滴定该溶液至淡黄色，加入0.5mL淀粉-碘指示剂。当蓝色消失时滴定停止。记录标准溶液量，并同时用滴定法测量空白溶液。1 g of potassium iodide (KI) and 5 mL of water were added to a 250 mL iodine flask into which 15.00 mL of K 2 Cr 2 O 7 standard solution and 5 mL of hydrochloric acid (volume ratio 11) had been added to the flask
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