Method for measuring free acid in methyl chloroacetate
A technology for the determination of methyl chloroacetate and its method, which is applied in the field of determination of free acid in methyl chloroacetate, can solve the problems of low acid value results and difficulty in grasping, achieve rapid discoloration, avoid inaccurate measurement values, and facilitate titration Effect
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[0008] In order to make the content of the present invention more easily understood, the present invention will be described in further detail below according to specific embodiments,
[0009] The separating funnel is a 125ml conical separating funnel, and the acid-base titration container is a 250ml Erlenmeyer flask. Add 50ml of distilled water to the 125ml conical separating funnel, and weigh the measured sample M=3~5g (by The amount of the sample to be tested depends on the level of acidity, the amount weighed is accurate to 0.0001g), put it into a 125ml conical separatory funnel, add 20ml xylene, plug the stopper and shake for about 2 minutes, and keep opening the piston upwards Exhaust, then place it vertically, and let it stand for about 5 minutes. Put the mixed liquid in the middle and lower layers of the 125ml conical separating funnel into a 250ml Erlenmeyer flask, add 10 drops of bromocresol green-methyl red mixed indicator, and use 0.1mol / L Sodium hydroxide standard...
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