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首页> 外文期刊>American Journal of Analytical Chemistry >Titrimetric Study of the Solubility and Dissociation of Benzoic Acid in Water: Effect of Ionic Strength and Temperature
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Titrimetric Study of the Solubility and Dissociation of Benzoic Acid in Water: Effect of Ionic Strength and Temperature

机译:苯甲酸在水中的溶解度和离解的滴定法研究:离子强度和温度的影响

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The apparent acid dissociation constant (Kc) of benzoic acid in water has been determined ti-trimetrically under ionic strength values between 0.00 and 0.50 mol·L﹣1 at a range of temperatures between 16°C and 41°C. The thermodynamic dissociation constant (as pKa) of benzoic acid was determined as 4.176 at 25°C. No regular correlation between pKa of benzoic acid and the temperature in the range was used. The values of pKa are inversely proportional to temperatures between 16°C and 30°C. In this range of temperature, the values of thermodynamic quantities () for the dissociation process of benzoic acid in water were calculated by using Van’t Hoff plot. For this case the dissociation was not favoured through entropy and enthalpy changes. The values of pKa are directly proportional to temperatures between 30°C and 41°C.
机译:苯甲酸在水中的表观酸解离常数(Kc)已在离子强度值为0.00至0.50 mol·L﹣1的条件下,在16°C至41°C的温度范围内以滴定法测定。在25℃下,苯甲酸的热力学解离常数(pKa)为4.176。苯甲酸的pKa与该范围内的温度之间没有规则的相关性。 pKa的值与16°C至30°C之间的温度成反比。在此温度范围内,使用Van’t Hoff曲线计算出水中苯甲酸解离过程的热力学量()值。对于这种情况,通过熵和焓的变化并不有利于解离。 pKa的值与30°C至41°C之间的温度成正比。

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