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Chemistry Lab: Concentration's effects on Rate of Reaction

Chemistry Lab: Concentration's effects on Rate of Reaction


The aim of this investigation is to investigate the rate of reaction of magnesium (mg) with Hydrochloric acid (HCl). After studying the availability of equipment I have chosen to investigate how concentration can affect the rate of reaction. Other variables that affect this investigation are:

- Concentration of solution

- Temperature

- Surface area of a solid

- Catalyst

- Light

- Pressure of a gas


I predict that when changing the concentration of hydrochloric acid and water, the slower the rate of reaction will be. I think this because when observing a previous experiment, it showed the less Hydrochloric acid and the more water used in a test tube, the rate of reaction is slow.

Scientific knowledge:

To help me gain better knowledge about the investigation I have found out some scientific information relating to the experiment of ‘rates and reaction’. The main areas I have covered are concentration of solution, temperature and catalyst.

After researching my scientific evidence I have found out that depending on collisions in particles will depend on the reaction being faster or slower. This happens if the reacting particles collide with each other, or there is sufficient energy in the collision to overcome the activation energy.


To increase the rate of reaction, the concentration of the reaction needs to increase this is by the

Hydrogen and magnesium ribbon being added to the solution of Hydrochloric acid. The following reaction occurs:


If temperature is increased the rate of reaction also increase. This is by the chemical particles receiving kinetic energy. If more kinetic energy is present in the particles, the particles move faster, this also means the particles will be colliding with each other often.


A catalyst is a substance that changes the rate of reaction but remains unchanged itself therefore it is an element that changes the rate of a chemical reaction without being used up. For example, iron speeds up the reaction between nitrogen and hydrogen to make ammonia.


Test Tube Rack
2 Measuring Cylinders
5 Magnesium Strip
Hydrochloric Acid
Test Tubes
Sand Paper
Stop Clock


1. Collect all equipment; cut 5 magnesium strips (10cm) the same size. After that, using the sandpaper, sand any Magnesium Oxide layer (rust) off the magnesium strips.

2. Collect the hydrochloric acid and measure out...

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Category:   Chemistry

Length:   4 pages (861 words)

Views:   30329

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