Introduction: The purpose of this lab experiment is to determine the atomic weight of magnesium by measuring the amount of hydrogen gas evolved when hydrochloric acid reacts with magnesium. The reaction is as followed: Mg + 2HCL H2 + Mg2+(aq) + 2Cl-(aq)
This can be demonstrated by measuring the hydrogen gas evolved by performing a chemical experiment when hydrochloric acid reacts with the magnesium. The formulated reaction includes; Mg + 2HCl → H2 + Mg2+(aq) + 2Cl- (aq)
The major findings contributing to the experiment is being able to determine and distinguish what moles have evolved thus being the hydrogen moles evolved allowing the magnesium to be consumed within the reaction.
Procedure: 1st. Obtain a 600ml beaker, add 300ml of water
2nd. add 30ml of HCl (2M) to the beaker and stir
3rd. add 10mg of Magnesium metal to the beaker
4th. Allow hydrogen gas to evolve, all of the magnesium should be consumed. 6th. Record the amount of hydrogen gas evolved using the chemical property dialog.
<Include information that the reader would need to repeat your experimental procedure. Do not include any observations or results in this section.>
Observations and Results Moles of hydrogen evolved: 0.000829g (8.29 x 10-4)/ 0.000411 moles, (4.11 x 10-4)
Moles of H2 evolved = moles of Mg consumed
Atomic weight of Mg= /0.000411moles
During my observation I noticed that when 10mg of magnesium metal was added to the beaker a shaded area appeared on the bottom of the beaker. When the bubbles stopped and the shaded area in the beaker disappeared it showed that the magnesium has been consumed.
The moles of hydrogen gas that have evolved during the experiment resulted in 0.000411.
The calculated atomic weight of magnesium is determined by the formula of; atomic weight of Mg (in
