Magnesium And Hydrochloric Acid Reaction Report

Reaction between Magnesium and Hydrochloric Acid

I am going to investigate how the concentration of the acid in the reaction affects the speed at which the gas, hydrogen, is given off.

Magnesium + Hydrochloric acid -----> Magnesium chloride + Hydrogen

Mg + 2HCl -----> MgCl2 + H2

Prediction

I predict that as I increase the concentration of the hydrochloric acid, the speed the gas is given off will also increase. I think this because the reaction is caused by collisions between the acid particles and the metal particles. As I increase the concentration of the acid, more acid particles will be in the same volume of solution. This means that the collisions are

The graph shows that the results all followed a very similar trend, as my curve of best fit is smooth.

As I did the experiment and drew my graph, I noticed that the gap between the results for the lower molar values were much further apart than the results for the higher values.

Evaluation

The experiment went very well, I obtained the results I expected and the results were accurate. I found only one anomalous result and this was only slightly out of the trend of the other results. This anomalous result could have been caused by a delay to put the bung in the conical flask, so losing some of the gas. Their could also have been slight parallax errors in reading the results off the measuring cylinder. To make my work accurate I did the following:

· Made sure I had the same amount of magnesium each time.

· Measured all the liquids from the meniscus in the measuring cylinders.

· Started the timer at the same point each time: when the bung was replaced to the