Experiment 6

Enthalpy Determination 2

Aim : To calculate a Heat of Reaction

Directions : Measure out 50 ml of the 1 molar sulphuric acid into a 
Styrofoam cup and record its temperature . Quickly add between 0.5 and 
0.6 grammes of a strip of magnesium metal . Swirl  to mix thoroughly 
while recording the temperature .
Write down the maximum temperature increase .

Discussion :
Taking the volume of solution to be 50 ml , the density as 1 g/ml and the 
specific heat capacity to be 4.2 J /g / K calculate the heat of reaction for 
the reaction .

Discussion must include any assumptions made , sources of error , efforts to 
reduce the sources of error , definition of heat of neutralization , appropriateness
of method , theoretical value , reasons for difference between theoretical and 
experimental value , limiting reagent .

DISCUSSION MUST BE IN A LOGICAL ORDER , MARKS WILL BE DEDUCTED FOR LACK OF 
CLARITY IN EXPRESSION AND FLUENCY OF THOUGHT

Skilled Assessed : Analysis and Interpretation

Calculation	of Heat				3 mks
Calculation of limiting reagent		2 mks

Discussion on the pts 				
concept of limiting reagent			2 mks
assumptions made 					3 mks
sources of error					2 mks
efforts to reduce the sources of error	2 mks
definition of heat of neutralization	1 mk
comment on appropriateness of method	2 mks
theoretical value					1 mk
reasons for difference between theoretical	
and experimental value 				2 mks

Total = 20 mks