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Mg+HCl Lab

KW

Kim Waters

Transcript

Question:

Does the amount of magnesium determine how much mass is lost during the reaction?

Sam Moorer

Africa Foskey

Kim Waters

Mg+HCl Lab

Materials

  • 125 mL Erlenmeyer Flask

  • Ice

  • Test Tube Brush

  • 50 mL 6 M HCL

  • Massing Cup

  • Permanent Marker

  • Gloves
  • Magnesium Ribbon

  • 600 mL Beaker

  • Forceps

  • Dropper

  • Balance

  • Scissors

  • 100 mL Beaker

Hazards

Standard safety contract applies.

Hydrochloric acid is a clear liquid; pungent odor; constantly fuming. Highly toxic by inhalation and ingestion. Severely corrosive to all body tissues, especially skin and eyes. Avoid all body contact.

Magnesium is a silvery-white, odorless, metal, turnings or ribbon. Substance not considered hazardous. However, not all health aspects of this substance have been thoroughly investigated.

Procedure

Observations

Data

Dependent Variable:

Acid: Clear, liquid.

The mass after the reaction.

Magnesium: Silvery-white, flexible , bendable, coiled up.

Empty Erlenmeyer Flask: 95.77g

Acid+Flask: 150.25g

Empty Massing Cup: 1.98g

Magnesium: 1.5g

Flask+Contents: 150.14g

Then, we used forceps and scissors to cut the magnesium ribbon into small strips.

We then, tared the balance and measured the amount of magnesium we wanted and recorded the amount in our data.

Next, we filled the 600 mL beaker with ice, to make an ice bath for the flask. Then, we lowered the flask into the ice.

Then, using the forceps, we added the magnesium pieces slowly until it was all added and reacted.

We recorded our observations in our data while letting the reaction cool.

After the reaction was cooled, we dried the outside of the flask and massed the flask+ contents and recorded the mass in our data.

Finally, we cleaned up all of our materials and got a clean signature.

Independent Variable:

Reaction: Lots of steam/gas comes out of the flask. The gas smelled bad. The magnesium dissolves in the acid. There are bubbles around the magnesium as it dissolves. Flask becomes hot during reaction.

The amount of magnesium.

0.11g was lost during the reaction

Observations

Data of Test #1

Constants:

Acid: Clear, liquid.

Claim

Magnesium: Silvery-white, flexible , bendable, coiled up.

Our question for this project was, Does the amount of Magnesium determine how much mass is lost during the reaction? Our data showed that, yes, the amount of magnesium does determine how much mass is lost during the reaction.

The starting amount of HCL.

The size of the flask.

The type of metal being used.

The starting temperature.

Empty Erlenmeyer Flask: 95.70g

Acid+Flask: 150.86g

Empty Massing Cup: 1.91g

Magnesium: 0.5g

Flask+Contents: 151.1g

0.24g was gained during the reaction.

Reaction: A little steam/gas comes out of the flask. The gas smelled bad. The magnesium dissolves in the acid. There are bubbles around the magnesium as it dissolves. Flask becomes hot during reaction.

Procedure

Data of Test #2

Observations

Evidence

Acid: Clear, liquid.

Magnesium: Silvery-white, flexible , bendable, coiled up.

For test one we gained 0.24g during the reaction when using 0.5g of Mg. For test two we gained 0.25g during the reaction when using 1.0g of Mg. For test three we lost 0.11g during the reaction when using 1.5g of Mg. Comparing test one and test three, test three had more gas coming out of the flask during the reaction.

Empty Erlenmeyer Flask: 95.77g

Acid+Flask: 151.15g

Empty Massing Cup:1.89g

Magnesium: 1.00g

Flask+Contents:151.40g

First, we cleaned all the necessary materials physically and chemically.

We then labeled and massed the Erlenmeyer flask.

After we labeled the 100 mL beaker we went to the fume hood, put on gloves and poured approximately 50 mL of hydrochloric acid into the beaker.

Once back at our desk, recorded observations or the acid in our data.

Then, we measured 50 mL of 6 M HCL into the flask and took care of the extra acid.

Next, we massed the acid + flask and recorded it in out data.

We then labeled our massing cup and massed the empty cup and recorded it in our data.

After obtaining the magnesium ribbon, we recorded observations of it in our data.

Reaction: Steam/gas comes out of the flask. The gas smelled bad. The magnesium dissolves in the acid. There are bubbles around the magnesium as it dissolves. Flask becomes hot during reaction.

0.25g was gained during the reaction

Reasoning

The amount of magnesium does determine how much mass if lost during the reaction because the magnesium is the limiting reactant in this equation. Only a certain amount of acid is used to dissolve the magnesium, the amount of acid used depends on the gram amount of the magnesium. ( http://quiz2.chem.arizona.edu/preproom/Limiting%20Reactants%20-%20Mg%20and%20HCl.htm)

In our case, 0.75 mol of HCL was used with 0.5g of Mg, 1.5 mol of HCL was used with 1.0g of Mg, and 2.2 mol of HCL was used with 1.5g of Mg.