7. EbulliometerProcedure:<br />1) 15 ml of water was pour into the tank until the level of the interior ring fixed in fund to the inside boiler.<br />2) The arm was fixed with thermometer.<br />3) The water was filled to condenser to it’s maximum.<br />4) The spirit lamp was placed under the ring and wait until the water boils.<br />5) The mercury path was observed moving.<br />6) The zero mark of the scale was placed coincides to the mercury level and fix it.<br />7) The water was removed in the boiler and fill it with the sample.<br />8) Again the sample was boiled as earlier.<br />9) Mercury path moving was observed.<br />10) When it is stabilized the mark was slided along the scale and place where it coincides with the mercury level.<br />11)The value shown on the scale is the alcohol contenet of the sample.<br />Results <br />ReplicatesAlcohol strength %13.523.8<br /> Mean Alcohol strength % = 3.5 + 3.8 / 2 = 3.65 %<br />Discussion<br />A very important thing is, from experiment 1 we can measure titrable acidity only.Not the totale acidity of tha sample.alcohols are also acids.But result’s not including alcohol acidity.because alcohols don’t react with NaOH.<br />NaOH + Alcohols <br />The name ebulliometer has its roots in the latin word quot;
ebullioquot;
: meaning to boil or bubble up.<br />An ebulliometer is designed to accurately measure the boiling point (temperature) of water or a water solution, by measuring the temperature of the vapour generated away from the heat source .<br />An ebulliometer was first used to determine the molecular weights of substances, by measuring the changes in the boiling point of water cause by the presence of the unknown substance<br />An ebulliometer apparatus consists of -<br />1. - A chamber to hold the liquid whose boiling point is to be determined, designed to allow for a semi-remote heat source.<br />2. - A condenser (reflux), to continually condense the vapour generated, to maintain the initial concentration of the liquid being tested.<br />3. - A special, precision thermometer (Churchward), calibrated in 0.02oC with a range of 95 - 115oC<br />A special bent thermometer can also be used. The bend thermometer is able to accommodate a horizontal sliding scale with a zero pointer, allowing an approximate (+/- 0.1% v/v) alcohol concentration level to be read directly of the scale.<br />4. - A heat source such as a spirit (alcohol) burner.<br />5. A heat chimney/shield to promote efficient burning by drawing in oxygen via the convection currents created and to isolate the heat source from the vapour produced.<br />6. - An outlet tap to allow removal of rinsing or tested liquid.<br />Reeference <br /> wikipedia<br />17716502819400<br /> <br /> B.R.MADUSHAN<br />AS 65568<br />1ST YEAR<br />FOOD SCIENCE & TECHNOLOGY<br />