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# How does the concentration if a regent affects the speed of chemical reaction?

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Introduction

CHEMICAL REACTIONS Aim: How does the concentration if a regent affects the speed of chemical reaction? My reaction will use Calcium carbonate which is a solid and hydrochloric acid which is a solution in the acid particles that are free to move around. I predict that the stronger the acid concentration, the faster the chemical reaction so 2 molar would be faster than 1 molar in a fair test. This is because of a higher concentration of the acid solution contains more particles per cm than the lower concentration acid solution. The rate of a reaction depends on how hard and fast the hydrochloric acid and the calcium carbonate particles collide. Hydrochloric particles are free to move when in the solution. When mixed with calcium carbonate, more concentrated acid reacts faster because there are more collisions per second. In fact if you double the acid concentration you get twice as many particle per cm3 so twice as many collisions so you get double the speed of reaction. ...read more.

Middle

> I put 25cm of acid in the flask (measure using a clean measuring cylinder) > Than I added the marble chips and put the stopper on the flask. > I recorded the results (volume of gas in the syringe) for every 5 second until 60 seconds for 2, 1, 0.5, 0.25, 0.125 molar of acid. > I repeated the experiment 3 times for each concentration I tried 5 different concentrations. VOLUME OF GAS (CM ) 0.125 MOLAR ACID TIME(S) 1st 2nd 3rd AVERAGE 5 11 10 10 10.3 10 12 12 11 11.6 15 13 13 13 13.0 20 14 16 14 14.6 25 14 17 16 15.6 30 15 20 17 17.3 35 15 22 18 18.6 40 16 24 19 19.6 45 16 25 20 20.3 50 16 26 21 21.0 55 16 27 21 21.3 60 16 29 22 22.3 0.25 MOLAR ACID TIME(S) 1st 2nd 3rd AVERAGE 5 18 8 6 11.0 10 19 10 7 12.0 15 20 11 10 13.6 20 21 12 11 14.6 25 22 13 ...read more.

Conclusion

14.6 15.6 17.6 39 25 15.6 16.6 18 22.6 50.3 30 17.3 17.6 23 27.6 54 35 18.6 18.6 26.3 32.6 58.3 40 19.6 19.6 29.3 38.6 63.3 45 20.3 20 33.3 43.3 66.6 50 21 20 37.3 48.3 72.3 55 21.3 21.3 40.3 53.36 77.5 60 22.3 23.3 43.6 59.3 80.6 CONCLUSION I think that I did the experiment fair as possible and my prediction came out right. I predict that the 2 molar acid would have been stronger that 1 molar 0.5 molar 0.25 molar and 0.125 molar. I also believe that the collision theory came out right as the high the concentration of acid the faster the reaction happened the solution when from a colourless liquid to a opaque. EVALUATION I think that I did the experiment very fairly as I measured every think carefully and took three reading. But the clamp did not hold the syringe parallel to the table. I could have done it fairer by taking more reading or getting steady clamp or using two clamps. BY VEER RAGHVANI ...read more.

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