Sodium acetate content in polyvinyl alcohol resin can be measured by acid-base titration, and concrete steps are as follows:
Take a certain amount of polyvinyl alcohol resin sample, add it to an appropriate amount of deionized water, and stir well to completely dissolve the sample.
Take a certain amount of hydrochloric acid (HCl) solution, neutralize it with sodium acetate (NaOAc) in the sample, and convert the sodium acetate in the sample into acetic acid (CH3COOH).
Filter the sample and make it to volume to obtain a solution of acetic acid. Use indicators such as phenolphthalein or bromophenol green to titrate a sodium hydroxide (NaOH) solution of known concentration, and record the titration volume.
Calculate the content of sodium acetate, the formula is: sodium acetate content (%) = (titration volume × concentration × 82.03) / sample weight.
Among them, 82.03 is the molar mass of sodium acetate, the concentration unit is mol/L, and the sample weight unit is g.
NBCHAO reminds you: During the operation, you should pay attention to strictly control the concentration of the solution and the stirring speed of the solution during the titration process, so as to ensure the accuracy and repeatability of the measurement results.
