Ethanol density table for ethanol water mixture at 20C | dilution made easy

    The ethanol density table for the ethanol-water mixture at 20 C. It contains Percentages by volume, % by weight, ethanol density, and relative densities.

    Density of ethanol and water mixture at 20 C
    عيار
    الكحول
    % وزناالكثافةالكثافة
    النسبية
    % v/v% w/wρ g/mLd 20/20
    0.00.00.9981.000
    1.00.80.9970.999
    1.31.00.9960.998
    2.01.60.9950.997
    2.52.00.9950.996
    3.02.40.9940.996
    3.83.00.9930.995
    4.03.20.9920.994
    5.04.00.9910.993
    6.04.80.9900.992
    6.35.00.9890.991
    7.05.60.9880.990
    7.56.00.9880.990
    8.06.40.9870.989
    8.77.00.9860.988
    9.07.20.9860.988
    10.08.00.9850.987
    11.08.80.9840.986
    11.29.00.9830.985
    12.09.60.9820.984
    12.410.00.9820.984
    13.010.50.9810.983
    13.711.00.9800.982
    14.011.30.9800.982
    14.912.00.9790.981
    15.012.10.9790.981
    16.012.90.9780.980
    16.113.00.9780.980
    17.013.70.9770.979
    17.314.00.9760.978
    18.014.60.9760.978
    18.515.00.9750.977
    19.015.40.9750.977
    19.716.00.9740.976
    20.016.20.9740.976
    20.917.00.9730.974
    21.017.10.9720.974
    22.017.90.9710.973
    22.118.00.9710.973
    23.018.70.9700.972
    23.319.00.9700.972
    24.019.60.9690.971
    24.520.00.9690.970
    25.020.40.9680.970
    25.721.00.9670.969
    26.021.20.9670.969
    26.922.00.9660.968
    27.022.10.9660.968
    28.022.90.9650.967
    28.123.00.9650.966
    29.023.80.9630.965
    29.324.00.9630.965
    30.024.60.9620.964
    30.525.00.9620.963
    31.025.50.9610.963
    31.626.00.9600.962
    32.026.30.9600.962
    32.827.00.9590.960
    33.027.20.9580.960
    34.028.00.9570.959
    35.028.90.9560.958
    35.129.00.9550.957
    36.029.80.9540.956
    36.330.00.9540.956
    37.030.60.9530.955
    37.431.00.9520.954
    38.031.50.9510.953
    38.532.00.9500.952
    39.032.40.9500.952
    39.733.00.9490.950
    40.033.30.9480.950
    40.834.00.9470.948
    41.034.20.9460.948
    41.935.00.9450.947
    42.035.10.9450.947
    43.036.00.9430.945
    44.036.90.9410.943
    44.137.00.9410.943
    45.037.80.9400.942
    45.238.00.9390.941
    46.038.70.9380.940
    46.339.00.9370.939
    47.039.60.9360.938
    47.440.00.9350.937
    48.040.60.9340.936
    48.541.00.9330.935
    49.041.50.9320.934
    49.542.00.9310.933
    50.042.40.9300.932
    50.643.00.9290.931
    51.043.40.9280.930
    51.744.00.9270.929
    52.044.30.9260.928
    52.745.00.9250.926
    53.045.30.9240.926
    53.846.00.9230.924
    54.046.20.9220.924
    54.847.00.9200.922
    55.047.20.9200.922
    55.848.00.9180.920
    56.048.20.9180.920
    56.949.00.9160.918
    57.049.10.9160.918
    57.950.00.9140.915
    58.050.10.9140.916
    58.951.00.9120.913
    59.051.10.9110.913
    59.952.00.9090.911
    60.052.10.9090.911
    60.953.00.9070.909
    61.053.10.9070.909
    61.954.00.9050.906
    62.054.10.9050.907
    62.955.00.9030.904
    63.055.10.9020.904
    63.956.00.9000.902
    64.056.10.9000.902
    64.857.00.8980.900
    65.057.10.8980.900
    65.858.00.8960.897
    66.058.20.8950.897
    66.859.00.8930.895
    67.059.20.8930.895
    67.760.00.8910.893
    68.060.30.8900.892
    68.761.00.8890.890
    69.061.30.8880.890
    69.662.00.8870.888
    70.062.40.8860.888
    70.663.00.8840.886
    71.063.50.8830.885
    71.564.00.8820.883
    72.064.50.8810.883
    72.465.00.8790.881
    73.065.60.8780.880
    73.366.00.8770.879
    74.066.80.8750.877
    74.367.00.8750.876
    75.067.80.8730.875
    75.268.00.8720.874
    76.069.00.8700.872
    76.169.00.8700.872
    76.970.00.8680.869
    77.070.10.8670.869
    77.871.00.8650.867
    78.071.20.8650.867
    78.772.00.8630.864
    79.072.30.8620.864
    79.673.00.8600.862
    80.073.50.8590.861
    80.474.00.8580.860
    81.074.70.8560.858
    81.375.00.8560.857
    82.075.80.8540.856
    82.276.00.8530.855
    83.077.00.8510.852
    83.878.00.8480.850
    84.078.20.8480.850
    84.779.00.8460.847
    85.079.40.8450.847
    85.580.00.8430.845
    86.080.60.8420.844
    86.381.00.8410.842
    87.081.90.8390.841
    87.182.00.8380.840
    87.983.00.8360.837
    88.083.10.8360.838
    88.784.00.8330.835
    89.084.30.8330.834
    89.585.00.8310.832
    90.085.70.8290.830
    90.386.00.8280.830
    91.087.00.8260.827
    91.888.00.8230.825
    92.088.30.8220.823
    92.589.00.8210.822
    93.089.60.8190.820
    93.390.00.8180.819
    94.091.00.8150.817
    94.792.00.8130.814
    95.092.50.8110.812
    95.192.60.8110.812
    95.493.00.8100.811
    96.093.90.8070.808
    96.194.00.8070.809
    96.895.00.8040.806
    96.995.10.8040.805
    97.095.30.8030.804
    97.596.00.8010.803
    98.096.80.7990.800
    98.197.00.7980.800
    98.898.00.7950.797
    99.098.30.7950.796
    99.899.00.7950.797
    100.0100.00.7890.791

    for more info about the density of ethanol see https://en.wikipedia.org/wiki/Ethanol

    Dilution of ethanol using ethanol density table

    Ethanol is usually sold in volumetric concentrations, other concentrations may be required to be prepared from it. dilution calculations are not as easy as they appear. thought they are divided into the following sections

    1- Preparation of a weight concentration of pure absolute ethanol

    To prepare a concentration of 70% by weight, for example, from ethanol, we take 70 grams of pure ethanol with 30 grams of water, and this is the concentration recommended by the World Health Organization for COVID-19.

    Amount of alcohol by weight = quantity to be prepared × desired concentration / 100

    Amount of water by weight = Amount to be prepared – Amount of alcohol required

    Example 1 – 1:  preparing 1000 g of ethanol 70% w/w using pure absolute ethanol

    Amount of alcohol by weight = 1000 × 70 / 100= 700 grams
    Amount of water by weight = 1000 – 700 = 300 grams

    2- Adding water to an amount of pure absolute ethanol to reach a specified concentration

    If we have a quantity of absolute alcohol, let it be 1000 grams, and we want to prepare 70% w/w alcohol from it, how much water is required to be added

    If the amount of alcohol available is by volume, it is converted to weight by multiplying by density

    Weight of available pure alcohol = volume of available pure alcohol × density of pure alcohol

    The density of pure alcohol: ρ = 0.789 g/mL

    Determine the total weight produced
    Total weight = weight of pure alcohol × 100 / required concentration

    Determine the weight of the water
    Weight of water = total weight – the weight of alcohol

    Example 2 – 1: adding water to a 1000ml of pure absolute ethanol to reach a specified 70% w/w

    Available alcohol weight = Volume of alchohol  × alchohol density

    Available alcohol weight = 1000 × 0.789 = 789 grams

    Total weight = weight of pure alcohol × 100 / required concentration

    Total weight = 789 × 100 / 70 = 1127 grams

    Water weight = 1127 – 789 = 338 grams

    Example 2- 2- dilution of 160 kg of pure alcohol

    Available alcohol weight = 160 kg
    Total weight = 160 × 100 / 70 = 228 kilograms
    Water weight = 228 – 160 = 68 kg

    3- Prepare a volumetric solution of pure absolute ethanol

    For the preparation of ethanol a concentration of 76.9% v/v from pure ethanol

    from the ethanol density table, we seek the weight percentage that meets the required volumetric percentage.

    From the table  76.9% v/v is equal to 70% w/w

    After this step, we go ahead as example 1

    4- Preparation of a specific w/w concentration using 96% v/v ethanol

    Ethanol is sold in the market in volumetric concentration, and for the purpose of sterilization, ethanol at a concentration of 70% by weight is required

    The first step is to know the weight concentration corresponding to the purchased ethanol. Then we look at the ethanol density table

    We note that 96% v/v (by volume) corresponds to 93.9% w/w (by weight)

    Weight of commercial alcohol required =
    quantity to be prepared (g) × concentration of alcohol to be prepared  ÷ concentration of commercial alcohol

    Weight of water required = Amount to be prepared – Weight of commercial alcohol required

    Example 4- 1: preparing 1000 g of 70% w/w alcohol from ethanol 96% v/v.

    From the ethanol density table, we find that 96% by volume of ethanol is equivalent to 93.9% by weight

    Weight of commercial alcohol required = 1000 × 70 ÷ 93.9 = 745 g
    Required water weight = 1000 – 745 = 255 grams

    Example 4- 2: preparing 1000 ml of 70% w/w alcohol from ethanol 96% v/v.

    From the ethanol density table, we find that 96% by volume of ethanol is equivalent to 93.9% by weight

    Weight of required = volume x denisty

    Density of 70% w/w alchol form the ethanol density table is: ρ = 0.868 g/mL

    Weight required = Volume required × density = 1000 × 0.868 = 868 g.

    Weight of commercial alcohol required = 868 × 70 ÷ 93.9 = 647 g
    Required water weight = 868 – 647= 221 grams

    5- diluting a specific weight of 96% v/v ethanol to reach a concentration of 70% w/w

    • If the available quantity is in kilos, we will take it as is
    • If the available quantity is in liters, we do the following
    • We take the density of alcohol available from the table of the density of ethanol
    • We multiply the volume of ethanol by its density to determine its weight
    • Weight of ethanol = volume of ethanol × density of available ethanol

    from the ethanol density table we found that 96% v/v  = 93.9% w/w by weight

    Total weight produced =
    Weight of available ethanol × required ethanol concentration % w/w
    ÷ commercial alcohol concentration % w/w

    Weight of water required = Total weight produced – Weight of commercial alcohol required

    Example 5- 1- diluting 1000 ml of ethanol 96% v/v to reach a concentration of 70% w/w

    Determining the weight of alcohol available:
    * From the table of the density of ethanol, we find that the density of ethanol 96% is 0.807
    * Available weight of ethanol is 1000 × 0.807 = 807 g
    The weight concentration of ethanol available from the ethanol density table, we find that 96% by volume of ethanol is equivalent to 93.9% by weight
    Weight of the resulting achohol = 807 × 93.9 ÷ 70 = 1082 grams
    Required water weight = 1082 – 807 = 275 grams

    Example 5- 2- A second practical application: extending 160 kg of 96% v/v alcohol to reach 70% w/w ethanol

    Determining the weight of alcohol available:
    * The available weight of ethanol is 160 kg given by weight, so there is no need to multiply it with anything
    Total weight of the product = 160 × 93.9 ÷ 70 = 214 kg
    Weight of water required = 214 – 160 = 54 kg

    Example 5- 3: diluting of 160 kg of alcohol 99% v/v by volume to reach ethanol 75% by weight

    from the ethanol density table 99% by volume of ethanol is equivalent to 98.3% by weight
    Total weight of the product = 160 × 98.3 ÷ 75 = 210 kg
    Weight of water required = 210 – 160 = 50 kg

     

     

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