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Investigation on rate of reaction with magnesium strip.

Extracts from this document...

Introduction

Investigation on rate of reaction with magnesium strip A student investigated the reaction between an acid and magnesium metal. He wanted to discover if the concentration of the acid had any effect upon the rate of reaction. The apparatus used: * a graduated tube * a delivery tube * dilute acid * trough * water * Magnesium ribbons Prediction I predict that the higher the concentration of acid, the faster the reaction because increasing the concentration of reactants in the solution increases the rate of reaction(s). Linking prediction to theory Reaction rate and concentration: The collision theory describes how the rate of reaction increases (the time taken for the magnesium ribbon to disappear when it reacts with the acid) when the concentration of acid increases. As the reaction continues, the concentration of the reacting substances decreases and so does the rate of reaction. The reaction is speeded up if the number of collisions is increased. ...read more.

Middle

7) Stop the timer as soon as the Hydrochloric acid and Magnesium stops reacting. The Magnesium will have stopped reacting when there is no fizzing. 8) Repeat the test again three times for each concentration of acid, 0.5, 1.0,. 2.0M, 2.5M and 3.0M. Time (s) Concentration Of Acid (M) 10 20 30 40 50 60 70 80 90 100 110 120 Water 0 0 0 0 0 0 0 0 0 0 0 0 0.5 0 0 0 0 1 2 3 4 5 6 6 7 0.75 0 1 3 6 8 11 13 14 14 14 14 14 1 3 7 11 15 16 16 16 16 16 16 16 16 1.5 4 15 15 15 15 15 15 15 15 15 15 15 Second Experiment Water 0 0 0 0 0 0 0 0 0 0 0 0 0.5 0 0 0 0 0 1 2 2 3 4 4 5 0.75 0 3 6 8 13 15 19 22 25 29 30 32 1 1 5 9 13 ...read more.

Conclusion

As reactions rely on successful collisions occuring, a higher collision frequency leads to a faster reaction rate. Furthermore as the number of water particles decreases there is becomes a smaller chance of the acid particles becoming obstructed by the water particles thus giving them more possibilities to collide with the magnesium. Evaluation I think my results could have been more accurate as I may have forgotten to rinse out the beaker cylinder between testing different concentrations. Another reason may have been that my measuring wasn't accurate enough. I may have used too much or too little acid concentration into the cylinder. The experiment could have been repeated using a wider range surface of areas. It could also be repeated using a different metal, other than Magnesium to make sure that the conclusion does not only refer to Magnesium. If the acid used was changed, the conclusion would not just apply to Hydrochloric acid. I would also use a gas syringe to measure the volume of gas. ...read more.

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