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# Does the concentration of a solution of acid affect the rate of reaction?

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Introduction

INVESTIGATION Does the concentration of a solution of acid affect the rate of reaction? AIM The aim of this investigation is to find out if the concentration of an acid can affect the rate of reaction. PREDICTION I predict that the more concentrated the solution acid the faster the rate of reaction and the less concentrated the acid the slower the rate of reaction. This is because when there is a higher concentration, there are more particles of acid within the same amount of solution. This means there are more chances that the surface area of the magnesium ribbon (that I will be testing with) will be hit and collided by the acid particles which will reduce the time for the reaction to take place and therefore increase the rate of reaction. FAIR TESTING The factor that I have decided to change is the concentration of the solution of acid. The factors I need to keep the same are: mass and length of magnesium strip, the volume of solution of acid, temperature of the solution and the surroundings, acid for solution. ...read more.

Middle

By using 2M hydrochloric acid I will take 40 ml of it to create a 2M concentration. 30ml of hydrochloric acid and 10ml of water to create a 1.5M concentration. 20ml of hydrochloric acid and 20ml of water to create a 1M concentration. 10ml of hydrochloric acid and 30ml of water to create a 0.5M concentration. EQUIPMENT 2M Hydrochloric acid Tap water Measuring cylinder 12 beakers Magnesium strip Scissors Ruler Timer PLANNED METHOD 1. Collect all the equipment 2. Measure out 10cm of magnesium ribbon and cut it. Collect 8 pieces of 10cm magnesium ribbon 3. Measure out 40ml of hydrochloric acid in a measuring cylinder 4. Pour it into a beaker 5. Put the magnesium ribbon into the acid solution and time how long it takes for the magnesium ribbon to completely disappear 6. Record 7. Repeat steps 3-6 with concentrations of 1.5M hydrochloric acid, 1M hydrochloric acid, 0.5M hydrochloric acid. Collect 3 of each for an average ACTUAL METHOD 1. Collect all the equipment 2. ...read more.

Conclusion

However, I do have a single rogue result that I have taken out of the average to create a more accurate graph. My method was generally good, nothing went wrong and all went as planned. Although the drop of time needed to dissolve the magnesium ribbon was more dramatic from 0.5M to 1M, I can still clearly see that a strong negative correlation is in place. There were some errors in this investigation. The strip of magnesium may have been uneven and even if I had cut it perfectly to 2cm, the masses may still be different; this could have caused inaccurate results. Moreover, it is difficult to judge when the magnesium is completely dissolved. This could have caused a few seconds of inaccuracy as it is hard to determine when to stop timing. To take this experiment further, I can use the syringe and find the gas loss of the reaction between the hydrochloric acid and magnesium. I could record the gas loss within a certain amount of time. This will be a much more accurate way of measuring this data. INVESTIGATION- Does the concentration of a solution of acid affect the rate of reaction? By: Matthew Behull 11T ...read more.

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