Industrial isopropanol (4)

4.

4.

After the sample is mixed with an equal volume of water, it is titrated with a sodium hydroxide standard titration solution, and the end point is indicated by a phenolphthalein indicator .

4.

4.

4.

4.

Micro burette: 2mL or 3mL, division value 0.

4.

Use a graduated cylinder to take 50 mL of water into a 250 mL conical flask, add 0.

4.

The mass fraction w _{2 of the} acid content (calculated as acetic acid) , the value is expressed in %, calculated according to formula (4):

Where:

V— The value of the volume of the standard titration solution (4.

c—The exact value of the concentration of the sodium oxide standard titration solution, the unit is moles per liter (mol/L):

50—The value of the volume of the sample, in milliliters (mL):

P _{20 is} the value at -20 ℃ sample density in grams per milliliter (g / mL);

M— The value of the molar mass of acetic acid (C ₂ H ₄ O ₂ ), in grams per mole (g/mol) [M=60.

Take the arithmetic mean of the two parallel determination results as the determination result

4.

According to the provisions of GB/T6324.
2-2004
.

4.
11 Determination of carbonyl content

According to the provisions of GB/T6324.
5
.

4.
12 Determination of sulfide content

According to the provisions of GB/T6324.
4
.