【摘要】 利用碳化钙易溶解于稀醋酸,而氟化钙不溶解于稀醋酸的特性。试样以稀醋酸处理,用滤纸过滤不溶物,滤液加氢氧化钾溶液调节pH≥13,用EDTA滴定法测定CaC2含量。过滤的不溶物连同滤纸在铂金坩锅中灰化、灼烧,加含有硼酸的混合熔剂,于950℃左右熔融、酸化浸取后,加氢氧化钾溶液调节pH≥13,用EDTA滴定法测定CaF2含量。更多还原

【Abstract】 Calcium carbide is prone to dissolve in spirit of vinegar,but calcium fluoride isn’t.base on this characteristic,the sample is disposed by spirit of vinegar,and the indiscerptible matter is filtrated by filter paper,contemporary acceded to potassium hydroxide in the filtrate while pH isn’t less than 13,we mensurating the content of CaC2 by EDTA.Filtrated indiscerptible matter and filter paper is incinerated and burned,and that acceded the mix flux of containing boracic acid,after they is melted,acidified and dipped in 950℃,contemporary acceded to potassium hydroxide in the filtrate while pH isn’t less than 13,we mensurating the content of CaF2 by EDTA.更多还原