Besides, since most investigations are based on the use of the phenolphthalein indicator, which provides a poor estimate of the real concrete carbonation depth, there is a high probability that past researches could have underestimate the corrosion potential associated to concrete carbonation. This ...
Titrate 具 0.5 N HCl 的过多的碱,使用 3 滴 phenolphthalein 指标。本地和被修改的树胶的最初颜色是轻微黄色的。本地淀粉的最初颜色是多云白色的和修改淀粉是清楚的。。使用一被校正的 ph 值米 ( 为 ph 值校准看见面包片 ) 帮助确定终点末端 翻译结果3复制译文编辑译文朗读译文返回顶部 滴定过量碱的 0.5 ...
Population explosion has a tremendous effect on land use/land cover (LULC) with profound impacts on the functioning of natural ecosystems (Steffen et al.2004). LULC analysis has become a fundamental tool in assessing the environmental consequences of human activity (Hunt and Ditzer2001; Veldkamp a...
A combination of phosphate (a mediator) and phenolphthalein (an indicator) was found to be the most successful. The choices of the initial pH and the concentration of the mediator are critical in this approach. The optimum concentration of the mediator is ca. 1~2???mM, and the optimum ...
The samples were then cooled and 40 mL of 0.5 mol equi/L KOH were 111 added. The slurry was kept under constant stirring at 200 rpm for 72 h. After this period, the 112 alkali excess was titrated with 0.05 mol equi/L HCl, using phenolphthalein as an indicator. 113 The solution was ...
The hydrogen chloride evolved in the reaction system was titrated (b ml) with a standard 0.1N aqueous sodium hydroxide solution (potency, f) using phenolphthalein as the indicator. The ion exchange group equivalent weight was calculated from the following equation. Ion exchange group equivalent ...
Rapid compleximetric method for estimating Ca in milk. 2. Use as indicator of a mixture of 2,7-bis[NN'-bis(carboxylmethyl)-aminomethylene-fluorescein and phenolphthalein. 来自 CAB Direct 喜欢 0 阅读量: 5 作者:BAJ Sedlacek,P Dusek
Two categories of alkalinity: Free and Total. Free Alkalinity is measured by added the indicator (phenolphthalein) and titrating with a weak sulfuric acid until you achieve a clear endpoint. Free alkalinity is a measure of the available cleaner to do the job Continued Total Alkalinity the measure...
Mpotassium hydroxidesolution in the presence ofphenolphthaleinas an indicator. One unit ( U ) ofenzyme activitywas defined as the amount of enzyme that liberated 1 −1 ). Analyses of thehydrolytic activitiesof immobilized biocatalysts were used to determine the yield ...
Acidity measurement, expressed in degrees [52,56], was determined by titration of a fluid extract of bread with 0.1 N NaOH solution in the presence of phenolphthalein as the indicator. 2.8. Sensory Analysis A group of 10 specially trained panelist, with ages between 25 and 60, evaluated the...