Experiment 7

Indicators

Aim : To calculate the concentration of a solution of ethanoic acid

Directions : Pipette out 25 ml of the 0.1 molar sodium hydroxide given . 
Titrate against the ethanoic acid solution given using each of the following 
indicators once .
Screened methyl orange , methyl red and phenolphthalein .

Results : Using the value for each indicator calculate the 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
Removing without funnel			1 mk
Swirling flask				1 mk
Manipulating drops			1 mk

Results
Precision of Readings			2 mks
Accuracy of Readings			1 mk