•The degree of ionization of phenolphthalein is closely interrelated with the structure state of water.•Phenolphthalein is used as an indicator for monitoring the vacuum freeze-drying process.•During the three stages of freeze-drying process, the colour changes of phenolphthalein show a high ...
a本实验中石 榴汁虽然为红色,但是在稀释多倍后石榴样品溶液基本为无色,因此可以采用酚酞为指 示剂。 In this experiment pomegranate juice although for red, but after dilution multiple pomegranate sample solution basically for colorless, therefore may use the phenol tai is the indicator.[translate]...
TA was measured by manual titration of 10 mL of extracted juice with 0.1 M sodium hydroxide (NaOH) using phenolphthalein as an indicator. The acid formula for citrus fruit samples (Eq. 1) was applied to calculate TA, expressed as % citric acid. $$TA \left(\% citric \, acid\right)= ...
Eventually, enough titrant is added to the test fluid to bring a particular chemical reaction to completion, also known as the reaction's “endpoint.” The endpoint can be determined by observing a change in color of an indicator that has been added to the test fluid. Phenolphthalein is one...
aIn a flask with a ground-glass stopper, dissolve 1.000 g in 10 ml of ethanol (96 per cent) R. Add 50.0 ml of 0.5 M sodium hydroxide. Close the flask and allow to stand for 1 h. Using 0.2 ml of phenolphthalein solution R as indicator, titrate with 0.5 M hydrochloric acid. Carry ...
polyoxyethylene (having the structure R--O--(C.sub.2 H.sub.4 --O).sub.n H) , glycerin, polyvinyl alcohol, and pH sensitive indicator dyes, including methyl red, p-nitrophenol, neutral red, phenolphthalein, and o- cresolph... H Dahms - US 被引量: 32发表: 1977年 ...
Further, phenolphthalein indicator was added and titrated with standardized 0.05 M NaOH. The same procedure was repeated to get the concordant value. The above procedure was followed –ofCSOOO3HH 2 M and to determine the acid density of –COOH NaCl solution. Finally, the acid density...
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 ...
The aqueous phase analysis was carried out using the titration method with 0.1N NaOH and phenolphthalein as an indicator to obtain malic acid concentration. The organic phase concentration of malic acid was determined through mass balance. The experimental runs were done in triplicate to confirm the...
In this case, the neutralization point was determined by a point in which phenolphthalein added as an indicator was changed from a solid color to a pink color.A film of the phenoxy resin D for an optical material having a thickness of 50 μm was obtained according to the same method and...