摘要
硼酸是一种多元弱酸,不能由氢氧化钠标准溶液直接滴定。在甘露醇、丙三醇等强化剂的作用下,硼酸能与其定量生成一种酸性更强的络合酸,可以由氢氧化钠直接滴定。通过最低pH值法和最大耗碱量法的比较发现,甘露醇对硼酸的强化效果优于丙三醇,能够实现对0.10mol/L硼酸溶液的准确滴定。在最优的甘露醇加入量(n(C6H14O6)∶n(H3BO3)=4∶1)时,甘露醇对不同浓度硼酸的强化效果相差不大,都能实现准确滴定。将该成果推广应用于HCl和H3BO3的混合酸的滴定,取得了理想的结果。
Boric acid is a weak polyacid, it can not direct titration with sodium hydroxide standard solution. In the effect of mannitol and glycerol,Boric acid can quantitativeform a complex acid and its pH is lower. The complex acid can direct titration with Sodium hydroxide. In this paper, though lowest pH value method and the maximum consumption of alkali method,we found that the strengthening effect of mannitol is better than that of glycerol. It can achieve accurate titration of 0.10mol/L solution. At the conditioning of n（C6H14O6）∶n（H3BO3）=4∶1 with mannitol,Boric acid of different concentrations has little differences with the strengthening effect ofmannitol. It achieved satisfactory result with appication of the research in mixed acid titration.
出处
《安徽化工》
CAS
2014年第2期87-89,共3页
Anhui Chemical Industry
关键词
硼酸
强化剂
甘露醇
Boric acid
fortifier
mannitol
