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How Does Changing the Concentration Of Hydrochloric Acid Affect the Speed It Reacts With Marble Chips?

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How Does Changing the Concentration Of Hydrochloric Acid Affect the Speed It Reacts With Marble Chips? Introduction: I am going to see if changing the concentration of acid affects the speed at which it reacts with marble chips. Marble chips + Hydrochloric acid ( Carbon dioxide + Water + Calcium chloride CaCO3 + HCl ( CO2 + H2O + CaCl2 I will measure how much gas is given off by using a tally counter to count how many bubbles of gas are given off and measuring the volume of gas produced. Diagram: Apparatus: 5g medium marble chips 50ml HCl 2 measuring cylinders Conical flask Bung and plastic tubing Tub of water Clamp Stopwatch Tally Counter Method: * Set up apparatus as shown, minus the HCl. * Add the HCl and make sure the bung is inserted as soon as all the HCl is in the flask. ...read more.


Safety: You must wear safety goggles when doing this experiment because acid is being used. This will burn and could blind you if it goes in your eyes. Make sure spillages are cleaned up immediately with the correct substance. Results: Time (secs) 1m 1.25m 1.5m 1.75m 2m BB V (cm?) BB V (cm?) BB V (cm?) BB V (cm?) BB V (cm?) 10 10 2 9 2 17 5 26 4 34 10 20 22 5 20 8 31 12 45 15 48 21 30 32 8 32 12 42 21 58 29 62 30 40 43 11 45 18 59 27 78 38 84 45 50 51 16 57 25 68 37 81 51 99 59 60 59 23 70 29 79 48 99 69 111 74 70 72 30 85 37 98 57 109 78 130 91 80 81 36 92 46 114 79 119 91 143 116 BB=No. ...read more.


For the amount of bubbles produced, none of the points were near the curve of best fit, especially the 1.75 molar results. Evaluation: I think that most of my experiment was accurate and the method was appropriate. Having said this, I think that something may have been wrong with the 1.75 molar acid because on both graphs the results are irregular. If I did this experiment again I would make sure that the acid was exactly what it was supposed to be. I think that I took enough readings because the averages were pretty much as expected and the graphs looked like I thought they would. I think that there should have been a holder in the end of the measuring cylinder because the plastic tubing kept moving around and it was difficult to get in. Having said this, I would have to make sure that the water could still come out, so a bung would be inappropriate. Charlie Durber 04/05/07 ...read more.

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