Core practical 7 - Measuring Enthalpy change of a reaction using a calorimeter Flashcards
(5 cards)
What is the first step?
Set up a conical flask connected to a gas syringe or inverted measuring cylinder - Allows accurate measurement of the hydrogen gas produced continuous monitoring method airtight to prevent gas loss
What is the second step?
Add 50cm3 of 1.0mol HClto the flask - Gives a known concentration and volume of the acid to react with magnesium - allows for rate of reaction to be calculated
What is the third step?
Measure a strip of magnesium ribbon and add it quickly to the flask. Immediately seal the flask with a bung start timer - Consistent mass of magnesium ensures a fair test
What is the fourth step?
Record volume of gas in syringe every 20 seconds until reaction stop - need regular measurements to develop a graph for rate of reaction
What is step 5?
Repeat the experiment with different concentrations of HCl while keeping magnesium constant - Allows to study how concentration affects rate of reaction.
