g

 

 

                                     Mg + 2HCl –> H2 + Mg2+ (aq) + 2Cl- (aq)

                     Magnesium + hydrochloric acid ? magnesium
chloride + hydrogen

In
conclusion, the lab that I completed found that the reaction of magnesium with
hydrochloric acid (HCI) produced hydrogen gas (H2). I used the
hydrogen gas (H2) to measure the atomic weight of magnesium.  The equation for the
reaction is below:

 

Conclusion

 

 

The
information in the balanced equation help me determine the atomic weight of
magnesium by showing me the relationships between the reactants, and the result
or product of the chemical interactions between them. The equation above
indicates that there is a one to one ratio between the number of moles of
hydrogen gas evolved and the moles of magnesium metal consumed in the reaction.
The calculated atomic weight of magnesium from this experiment is 24.331g/moles;
compared to 24.305.  The calculated atomic
weight from the lab weighed slightly more than the atomic weight of magnesium from
the periodic table.

                                         Mg + 2
HCl ? MgCl2(aq) + H2(aq)

 

When
the magnesium (Mg) was added to the hydrochloric acid (HCl), the magnesium
dissolved and formed bubbles of hydrogen gas (H2).  When the magnesium dissolved, it forms
magnesium ions with a +2 charge (Mg2+). And when the hydrogen atoms formed hydrogen
gas (H2), it left behind the chloride ions (Cl-). Then, the Mg2+ ions
bonded with the Cl- ions. The single replacement reaction equation is listed
below:

 

Mg
+ 2HCl –> H2 + Mg2+ (aq) + 2Cl- (aq)

I
will now discuss the the stoichiometry of the chemical reaction that I studies
in the lab.

 

                                 X=0.01g/0.000411 moles=
24.331g/moles

It
was interesting to observe the reaction between hydrochloric acid (HCI) with
magnesium. As soon as the magnesium and hydrochloric acid (HCl) mixed, the
magnesium was consumed and formed bubbles that dissipated into hydrogen gas (H2).
The moles of hydrogen gas that has evolved was 0.000411. To calculate the
atomic weight of magnesium I used the following formula: Atomic weight of Mg
(in grams) = weight (in grams) of Mg consumed / moles of H2 evolved. Example
below:

 

Discussion

 

 

 

Calculated
atomic weight of magnesium: __24.331g/moles___

 

Moles
of hydrogen evolved: ___0.000411 moles__

 

Observations and
Results

 

 

Step 6. I than recorded
the amount of hydrogen gas evolved.

 

Step 4. I than observed
as hydrogen gas evolved. All of the magnesium was consumed.

 

Step 3. I added 10 mg
of Magnesium metal to the beaker.

 

Step 2. I added 30 ml
of HCl (2M) to beaker and stirred it.

 

Step 1. I obtained a
600 ml beaker, and added 300 ml of water to it.

 

Procedure

 

 

 

The
major finding from this lab was that there is a chemical reaction between
hydrochloric acid (HCI) and magnesium. Because of this reaction, hydrogen gas (H2)
evolved.

 

 

A brief
summary of this lab would be, that we had to measure the atomic weight of
magnesium. the magnesium was dropped in a breaker that contained HCl. The
magnesium than became consumed and produced hydrogen (H2) gas. The
hydrogen gas (H2) was trapped in the beaker and measured. So, the
atomic weight of Magnesium resulted from the separating of hydrogen gas from
the acid in the Magnesium. Under normal circumstances, a mole of hydrogen gas
will be produced for every mole of Magnesium consumed (moles of H2
evolved = moles of Mg consumed).

 

The
purpose of this Lab was to determine the atomic weight of magnesium after it
reacts to hydrochloric acid (HCI).  We
than had to measure the atomic weight of magnesium by measuring the amount of
hydrogen gas that was evolved in the reaction to the magnesium.

 

Introduction

 

ATOMIC
WEIGHT OF MAGNESIUM LAB

 

iLab,
Week #3

Name:
Courtney Dietz