SU1425537A1 - Method of quantitative analysis of sodium acetate - Google Patents

Abstract

The invention relates to analytical chemistry, in particular the quantitative determination of CHj, COONa in aqueous solutions. To increase the accuracy of the analysis and reduce its duration, NaCl is added to the sample to be analyzed to saturate the solution and then potentiometric titration with hydrochloric acid is performed. These conditions allow the analysis time to be reduced from 60 to 15 times with better accuracy (up to 97%). 1 tab.

Description

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The invention relates to analytical chemistry, and specifically to volumetric methods for the quantitative determination of sodium acetate in aqueous solutions,

The aim of the invention is to improve the accuracy and shorten the detection time.

Example 1, 100 v.no of a sample containing vt g / l of sodium acetate are placed in a 300 ml titrean glass. The glass is placed on a magnetic stirrer and added with stirring; bitch sodium chloride brand h, d. a. until it is saturated with an excess of about 20 g., the glass and the chlorine-silver electrodes are then placed in a glass and then a titer of 1 mol / l with a titrated solution of hydrochloric acid from a burette with a capacity of 5 ml. The equivalent volume of titrant is obtained graphically from the curve of the potential of the grizzy titration or according to the Haan-Velier method.

 No se

With her

SAMPLE

where is H (titrantum С Mee concentrate 1 mol / l |

V

more

volume of titrant, about titration, 1-yes: | and gram-equivalent acetate

sodium (a 82 g) | “The amount of acetate solution on ri, taken for analysis,

MPO

Example 2 From an aqueous solution containing 5 g / l of sodium acetate, with a 50 MI probe, I take a sample into a 300 ml titration beaker. Further analysis and calculation are carried out analogously to example 1

Example 3: From a water solution of pSl containing sodium acetate / g, a 25 ml pipette is sampled with a 100 ml titration tube. Further analysis and calculation are carried out similarly to 1 s,

Example 4 From an aqueous solution containing 50 g / l of sodium acetate, a pro j is taken with a 20 ml pipette; bu titration glass with a capacity of 100 sludge. Further analysis and calculation are carried out analogously to example 1,

Example 5 From an aqueous solution containing 100 g / l of sodium acetate, a 10 ml pipette is sampled into a 100-nt titration beaker. Further analysis and calculation are carried out analogously to example 1

The results of determining the concentration of sodium cyium acetate in aqueous solutions according to the proposed method, as well as the calculated statistical characteristics are given in the table. When calculating the statistical characteristics, the concentrations x found are compared with a given concentration Cj calculated on the basis of the method of preparing sodium acetate solution, namely the weight of sodium acetate

5 grades, taken on an analytical balance, are dissolved in a volumetric flask and the acetate content is calculated. The statistical characteristics are calculated according to GOST 8 "207-76,

0 The duration of the analysis by a known method is more than 1 hour, the accuracy does not exceed 15%.

In this way,. propose (the method provides a significant increase in the accuracy and speed of analysis.

Claims (1)

Invention Formula 0 A method for the quantitative determination of sodium acetate in an aqueous solution by potentiometric titration, characterized in that 5 in order to increase the accuracy and 5 shortening the determination time; before titration, chlorine is added to the sample to be analyzed. D sodium to obtain a saturated solution and titration to be; give a solution of hydrochloric acid five B001 0.985 8.0., 0109 1 „007 S.0,004 15 iZIZZI , 004 5.02 0.04 1.01-0 0.989 0,990 0,993 1,004 5,021 5,007 4,986 4,970 4,895 5,048 5,012 24,86 24,59 25,10 24,75 25,22 25,04 25,31 49,75 49,44 50,52 50,70 50 , 28 49.86 49.91 Table continuation b 0,010 g / l S 1,01% S 0.05109 Sj. 0.01931 E 0,047 g / l S 0,947o 15 15 , 08 100.61 100.24 -99.35 98.86 100.02 99.48 98.98 S "0.8064 S -0.3048 b 0.75 g / l  "0.74% Note. When t 2,447 for p 7 P "0.95 Table continuation 15