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在20g的碳酸氢钠中加入100ml的水，煮沸5分钟。过滤，在剩余濾渣中加入100ml的水，煮沸5分钟，然后过滤。混合滤液，放冷却，用0.5M盐酸VS滴定，using methyl orange Cxylene cyanol FF solution as indicator。加入10ml氨水缓冲液(ph10.9)，用0.05mEDTA二钠VS滴定，using mordant black 11 solution as indicator.。在减去五分之一的0.05mEDTA二钠VS后，每ml的0.5M盐酸VS的量等同于42mg的碳酸氢钠。通过混合物以每ml的重量计算碳酸氢钠的百分数含量。 把没翻译的内容翻译完整。 |
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qingfeng877680(金币+6,VIP+0):谢谢兄弟的翻译。 9-10 20:52
qingfeng877680(金币+6,VIP+0):谢谢兄弟的翻译。 9-10 20:52
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在20g的碳酸氢钠中加入100ml的水，煮沸5分钟。过滤，在剩余濾渣中加入100ml的水，煮沸5分钟，然后过滤。混合滤液，放冷却，用0.5M盐酸VS滴定，using methyl orange Cxylene cyanol FF solution as indicator。加入10ml氨水缓冲液(ph10.9)，用0.05mEDTA二钠VS滴定，using mordant black 11 solution as indicator。在减去五分之一的0.05mEDTA二钠VS后，每ml的0.5M盐酸VS的量等同于42mg的碳酸氢钠。通过混合物以每ml的重量计算碳酸氢钠的百分数含量。 20g of NaHCO3 is added to 100ml of water, boiled for 5 minutes. After filtering, 100ml of water is added into remaining dregs, and then it undergoes 5 minutes for boiling, following filtering. Mixed filtrate is cooled. Titration is completed with 0.5M of hydrochloric acid, using methyl orange Cxylene cyanol FF solution as indicator. Adding 10ml of ammonia buffer (pH=10.9), 0.05m of EDTA is used to accomplish titration, using mordant black 11 solution as indicator. Four-fifth of 0.05m of EDTA is remained, and then 0.5M hydrochloric acid per ml is equivalent to the amount of 42mg of NaHCO3. The weight per ml of mixture is used to calculate content percentage of NaHCO3. |
2楼2009-08-15 12:08:56
