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To investigate the effects of different concentrations of Hydrochloric Acid when mixed with Calcium Carbonate.

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Introduction

Investigation to show the factors of rate of reaction Aim: To investigate the effects of different concentrations of Hydrochloric Acid when mixed with Calcium Carbonate. Calcium Carbonate + Hydrochloric Acid Calcium Chloride + Water + Carbon Dioxide CaCO 2HCL CaCl H 0 CO Hypothesis: I predicted that the more concentrated Hydrochloric Acid is the faster the rate of reaction would be. Low Concentration High Concentration When Hydrochloric Acid has a higher concentration it will have more particles, this makes the rate of reaction faster, which therefore means more collisions. It can be proved that if the concentration of the Hydrochloric Acid is higher then there will be more collisions, e.g if there were three-four people in a room and they were running around that would not collide as often as if there were fifteen-twenty people in a room. When the marble chips (Calcium Carbonate) are added there will be more collisions if the concentration is higher, so there will be more particles in the conical flask. ...read more.

Middle

Girl's hair would have to be tied back and also it is essential that all bags and stools be tucked in so people do not trip over them. If people are wearing glasses it is also advised to wear goggles. Method: 1. Take out all the equipment mentioned above in equipment list. 2. Measure 25ML of Hydrochloric Acid using a measuring cylinder and then pour it into a conical flask. 3. Measure 2.5 grams of Calcium Carbonate then apply it to the Hydrochloric Acid, which is already in the conical flask. When the Calcium Carbonate is added start the stopwatch instantly. 4. Stop the stopwatch and record the timings when the Calcium Carbonate has dissolved. 5. Repeat this experiment with different concentrations of Hydrochloric Acid, with 1, 1.5, 2, 2.5 concentrations of Hydrochloric Acid. Diagram: This is a diagram of what my basic apparatus when set up looked like. ...read more.

Conclusion

Evaluation: The investigation I carried out was accurate in terms of my results because they where all almost the same as each other, with only a few seconds difference between each. What I predicted was right as the higher the concentration is, the faster the rate of rate of reaction is. I also achieved my aim, which was to investigate the effects of different concentrations of Hydrochloric Acid when mixed with Calcium Carbonate. Improvements: If I did this experiment again I would have asked someone to start the stopwatch at the exact second, of me adding Calcium Carbonate to the Hydrochloric Acid. I would have also made sure I would have weighted how much Acid there was in each conical flask before starting the experiment. Apart from these improvements I could not improve anything on the practical side. But what I could have improved on, on the theory side is drawing the graphs on Microsoft Excel instead of hand drawing them, and also try and make the picture I drew for the hypothesis, on the computer. JINESH ADATIA 1 ...read more.

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