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    Home > Chemicals Industry > Chemical Technology > Industrial acetone (2)

    Industrial acetone (2)

    • Last Update: 2021-11-20
    • Source: Internet
    • Author: User
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    4 Test method

    The reagents and water used in this standard, unless other requirements are specified, all use analytical reagents that meet the current standards and the third-grade distilled water for laboratory use in GB/T6682 or water of corresponding purity


    4.


    Measure according to GB/T3143,

    4.


    Measure according to 2.


    The range of densitometer indication is 0.


    The sample should be measured at (20±5)℃


    4.


    Measure according to GB/T7534


    4.


    Thermometer: local immersion type, temperature range 45~65℃ or 50~70℃, division value 0.


    4.


    Calculated according to Chapter 6 of GB/T7534-1987, the K value is listed in Table 2


    Table 2 K value


    4.


    Measure according to GB/T6324.


    4.


    4.
    5.
    1 Instrument

    a) Alkaline burette: 2mL or 1mL, with a division value of 0.
    05mL;

    b) Pipette: 25mL;

    c) Erlenmeyer flask: 100mL
    .

    4.
    5.
    2 Reagents and solutions

    a) Distilled water: prepared according to GB/T6C3;

    b) Sodium hydroxide standard titration solution: c(NaOH)=0.
    01mol/L;

    c) Phenolphthalein indicator solution: 10g/L
    .

    4.
    5.
    3 Analysis steps

    In a 100mL conical flask, add 25mL distilled water and 2 drops of phenolphthalein indicator solution , add sodium hydroxide standard titration solution to neutralize to light pink, and then use a pipette to measure 25mL of the sample in a 100mL conical flask, and use hydrogen The sodium oxide standard titration solution is titrated to light pink: the end point is kept for 15s without fading
    .

    The acidity is expressed by mass percentage X 1 (calculated as acetic acid), calculated according to formula (1):

    Where: c— the actual concentration of sodium hydroxide standard titration solution, mol/L;

    V— Dosage of sodium hydroxide standard titration solution, mL;

    P t — the density of the sample at t℃, g/cm3;

    25—The volume of the sample, mL;

    0.
    060—The mass of acetic acid expressed in grams equivalent to 1.
    00mL sodium hydroxide standard titration solution [c(NaOH)=1.
    000mol/L] .

    4.
    5.
    4 Allowance

    The difference between the two parallel determination results is not more than 0.
    0002%, and the arithmetic mean is taken as the determination result
    .

     

     

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