5 Boiling point of inflammable liquids i Use a different method of heating inflammable liquids eg ethanol bp 784oC and acetone bp 56oC Put 2 cm of the inflammable liquid in a testtube Put the testtube in an empty beaker Put a thermometer into the testtube with the bulb in the liquid Boil water in an electric jug or on an electrical hot plate Pour the hot water into the beaker so that the level is higher than the inflammable liquid in the testtube Stir the inflammable liquid gently with the thermometer and read the thermometer when the inflammable liquid boils ii Use a very small testtube or seal one end of a piece of glass tubing 8 cm length and 3 cm external diameter Put the inflammable liquid into this tube Put a capillary tube sealed at one end into the inflammable liquid with the sealed end up and the open end down in the inflammable liquid Use a rubber band to attach the tube containing inflammable and capillary tube to the bulb of a thermometer Hold the apparatus in a beaker of water and heat gently with a Bunsen burner flame When the temperature rises bubbles slowly come out of the capillary tube At the boiling point the bubbles suddenly come out as a steady stream Read the temperature Let the water cool and read the temperature again when the steady stream of bubbles ceases Calculate the boiling point as the average of the two readings