Determination of the molar volume of hydrogen gas

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Determination of the molar volume of hydrogen gas

Introduction

We are going to determine the molar volume of hydrogen gas by letting known amount of magnesium react with dilute hydrochloric acid and carefully collecting the gas formed.

Materials

Gas syringe                

Hydrochloric acid, 2-molar

8 cm of magnesium ribbon

Ruler

Emery cloth

For details see instruction form

 

Methods

We connect the equipment according to the diagram and make sure we follow the instructions carefully, and then we weigh the 8 cm of magnesium ribbon and pour the HCl into the test tube. As we are ready to start the experiment we fold the mg ribbon on the hook and put the stopper into the test tube so that when we tilt the test tube the mg ribbon can easily fall into the acid. It is important to wait for the reaction to finish completely so that the equipment returns back to room temperature. For details see instruction form.

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Results:

Measured weigh of 8 cm mg ribbon: 0.068 g (uncertainty is ± 0.0001)

Room temperature: 21.9 ºC (uncertainty is ± 0.1)

Room pressure: 742.5 mmHg

Vapour pressure of water: 19.587 and 19.827

Vapour pressure: 19.587 + 19.827 / 2 = 19.707

1.333 x 102 x (mmHg) = Pa

Convert the room pressure in mmHg into Pa:

742.5 x 1.333 x 102 = 98975.25 Pa

Convert the vapour pressure of water into Pa:

19707 x 1.333 x 102 = 2626.9431

p(H2O) = 2626.9431 Pa

Room pressure (Pa) – Vapour ...

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