Core Practical 1

Question 1

What is the objective of core practical one?

Answer 1

Determine the molar volume of a gas by reacting a known amount of magnesium with excess HCl and measuring the volume of gas produced.

Question 2

What is the first step of this?

Answer 2

Measure the mass of the Mg ribbon: this will determine the number of moles of magnesium and therefore H2 gas being produced

Question 3

What is the second step?

Answer 3

Add a known excess volume of HCl to a conical flask: HCl must be in excess to ensure all the Mg reacts completely so gas produced only limited by Mg.

Question 4

What is the 3rd step?

Answer 4

Connect the flask to a gas collection system: Allows for accurate collection and measurement of H2 gas produced

Question 5

What is the 4th step?

Answer 5

Add the Mg ribbon to the acid quickly and replace the bung: H2 gas is released as soon as HCl and Mg react preventing gas loss so accurate measurement.

Question 6

What is the 5th step?

Answer 6

Wait until the reaction stops (no more gas collected): This indicates all the Mg has reacted total volume of H2 gas produced