Experiment 5

Enthalpy Determination 1

Aim : To calculate a Heat of Neutralization

Directions : Measure out 50 ml of the 0.1 molar sodium hydroxide solution into a 
Styrofoam cup and record its temperature . Quickly add 50 ml of a 0.1 molar 
solution of hydrochloric acid . Swirl to mix thoroughly while recording the temperature .
Write down the maximum temperature increase .

Discussion :
Taking the volume of solution to be 100 ml , the density as 1 g/ml and the specific heat
capacity to be 4.2 J /g / K calculate the heat of neutralization 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 .

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

Discussion on the pts 				
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 = 16 mks