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# Which concentration of acid when reacted with marble pieces gives off the largest volume of gas in the fastest time?

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Introduction

Which concentration of acid when reacted with marble pieces gives off the largest volume of gas in the fastest time? Aim My aim is to find out which concentration of gas when reacted with marble pieces gives off the largest volume gas in the fastest time. Prediction I think that the strongest concentration of acid will give off the largest volume of gas, as there will be more reactions quicker. Apparatus Hydrochloric acid Distilled water Small marble pieces Gas syringe Conical flask Measuring cylinder Cork Stop-watch Safety glasses Method 1. Firstly you need to collect your equipment. 2. You then need to set up your equipment carefully as shown in the diagram. 3. Then you measure 75ml of hydrochloric acid into a measuring cylinder. 4. You then put 10g of small marble pieces in the conical flask 5. Then add the hydrochloric acid, put the cork in and start the stopwatch. 6. Then record the volume of gas every 5 seconds until the reaction stops. ...read more.

Middle

This is the process involving elementary reaction steps. The slowest step controls the rate. The nature of the slow step is not obvious from the balanced equation. Only experimental observation reveals the link between concentration and reaction rates. Results Volume of gas given off (cm3) Volume of acid/water Time (Sec) 50/0 45/5 40/10 35/15 30/20 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 0 25 65 85 100 0 15 19 26 35 50 65 75 90 100 0 5 10 15 22 30 40 50 60 70 80 88 95 101 0 5 10 12 15 20 25 33 40 48 54 60 69 77 80 85 90 95 99 0 5 6 7 9 11 13 16 19 23 26 30 35 40 45 48 54 58 63 67 70 75 78 82 84 Conclusion From my results I have found out that the stronger the concentration of acid the larger the volume of gas given off in the quickest possible time. ...read more.

Conclusion

I think I could have improved my experiment by making sure the temperature of the acid was the same as it could have varied between the first experiment and the last. I could have measured the size and weight of the marble chips more accurately and made sure that I got exactly the right amount of acid and water. I have also made sure that as the experiment went on it was kept at the right temperature all the way through. I got some anomalous results because on my graph instead of going in a straight line it goes in a curvy line so I think something must have gone a bit wrong but overall my results are quite accurate but they could have been more accurate. From this experiment I can answer my question does the concentration of acid affect the volume of gas given off in an experiment with hydrochloric acid and marble chips? The answer to this would be changing the concentration of the acid makes the rate of reaction quicker or slower and more or less gas will be made depending on whether the concentration is stronger or weaker. ...read more.

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