电位滴定法
硅酸
化学
水溶液
平衡常数
滴定法
水解
离子
硅
无机化学
分析化学(期刊)
铝
配合物的稳定常数
氯化物
核化学
物理化学
电极
色谱法
有机化学
生物化学
作者
Staffan Sjöberg,Agneta Nordin,Nils Ingri
标识
DOI:10.1016/0304-4203(81)90005-0
摘要
The hydrolysis of silicic acid, Si(OH)4, was studied in a simplified seawater medium (0.6 M Na(Cl)) at 25°C. The measurements were performed as potentiometric titrations (hydrogen electrode) in which OH− was generated coulometrically. The total concentration of Si(OH)4, B, and log[H+] were varied within the limits 0.00075 ⩽ B ⩽ 0.008 M and 2.5 ⩽ -log[H+] ⩽ 11.7, respectively. Within these ranges the formation of SiO(OH)3− and SiO2(OH)22− with formation constants log β−11(Si(OH)4 ⇌ SiO(OH)3− + H+) = −9.472 ±0.002 and log β−21(Si(OH)4 ⇌ SiO2(OH)22− + 2H+) = −22.07 ± 0.01 was established. With B > 0.003 M polysilicate complexes are formed, however, with -log[H+] ⪆ 10.7 their formation does not significantly affect the evaluated formation constants. Data were analyzed with the least squares computer program LETAGROPVRID.
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