Title : QUANTITATIVE ANALYSIS I Aim : To determine the concentration of an acid . Apparatus : burette , pipette , conical flasks , funnel , hydrochloric acid , sodium hydroxide solution , screened methyl orange , Directions : You are provided with a solution of 6 g/L sodium hydroxide solution and a solution of hydrochloric acid . Determine by titration the molar concentration of the acid . Fill the 25 ml pipette with the sodium hydroxide solution . Empty into a conical flask and add a few drops of the indicator . Add acid to the burette to an appropriate mark . Add acid to the flask while swirling until you obtain a faint purple colour . Repeat for three titrations minimum or until you obtain two readings that do not differ by more than 0.1 ml . Questions : What was the molarity of the alkali ? What was the volume of alkali used ? What was the number of moles of alkali used ? What was the volume of acid required to neutralize the volume of alkali ? What was the number of moles of acid used ? What was the molar concentration of the acid ? Skilled Assessed Manipulation and Measurement Use of the pipette Point below surface at liquid 1 mk Meniscus at the mark 1 mk Proper draining 1 mk Use of the burette Filling and Adjusting Volume 1 mk Reading burette 2 mks Using without removing 1 mk Swirling flask 1 mk Manipulating drops 1 mk Results Precision of Readings 2 mks Accuracy of Readings 1 mk