Time for strip of magnesium to dissolve in a solution of water and acid

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How long does it takes a strip of magnesium to dissolve in a solution of water and acid

Introduction

I am aiming to find out how long it takes for a strip of magnesium, to dissolve, in a solution of water and acid.

Variables

Ø Concentration of acid
Ø Length of Magnesium
Ø Temperature of water
Ø Temperature of acid
Ø Amount of acid
Ø Size of conical flask
Ø Time taken

Fair test

The variable I will change is the concentration of acid. I will keep the length of the magnesium the same, as with the temperature of the water, amount of acid, size of conical flask and time taken. To make it a fair test.

Plan – Safety

Put safety goggles on

Equipment list

Ø Conical flask
Ø Stop watch
Ø 2 molar acid
Ø Magnesium strips
Ø Measuring cylinder

Instructions

1) Firstly I collected all my equipment

2) Measure 50ml of acid into a measuring cylinder

3) Pour acid into conical flask

4) Cut off a piece of magnesium (5cm)

5) Put the piece of magnesium into the conical flask and start the stop watch

6) Watch the reaction take place, and when all of the magnesium dissolves, stop the clock

7) Record the time in your table

8) Repeat this process twice

9) Repeat the whole process for the different concentrations of acid.

Prediction

GRAPH

I predict that the higher concentration of acid, the faster the magnesium strip will dissolve. In the higher concentration acid there will be a higher number of hydrochloric acid particles, in the same volume. This will result in more collisions, which therefore speeds up the rate of reaction, which will cause the magnesium to dissolve quicker. GRAPH

Conclusion

I have found out, by looking at my graph and results table, that the higher the concentration of acid, the faster the magnesium will dissolve. This happens because more collisions are happening in the same volume.
This is caused by more hydrochloric acid particles being added to the solution. Evaluation

As you can see on my graph, there are no anomalous results. This clearly shows that all of my results were reliable.

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