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How does the concentration of acid effect rates of reaction?

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Introduction

Title of Experiment: How does the concentration of acid effect rates of reaction? Background Knowledge If you make an orange dink from cordial, the cordial is a very solution of orange juice in water. It is usually far too strong to drink, so to make it suit our taste, we need to add water to it and dilute it. If we magnified the drink, stopped the particles from moving and compared the particles in them, they would look like this:- A high concentration of orange A low concentration of orange The stronger the solution, the higher its concentration. Wee need some way of measuring how high the concentration is, but we cannot count the particles, because it would be time-consuming, even if we could see them. There is a special way of measuring concentration. The moles in solution The concentration is sometimes called the molarity of a solution. 1M means that there is 1 mole of the substance dissolved in 1dm� (or 1000cm�) ...read more.

Middle

I used a constant volume of 40ml of hydrochloric acid and a constant mass of marble chips, which was 40gms. I used these concentrations 1M, 1.5M, 2M, 2.5M and 3M acid. I was given 1M, 2M and 3M acid. I had to dilute these concentrations to suit my needs. I planned to repeat the each concentration 3 times, if there was sufficient time. A factor that may have affected my results was if I diluted the acid incorrectly, this would have thrown the whole experiment and made my results inaccurate and unreliable. Apparatus Marble Chips Hydrochloric Acid Stop Clock Bung Connecting Tubes Glass Syringe Conical Flask Method Firstly, I measured out 4gms of marble chips and put them into a conical flask. Then, using a measuring cylinder I measured 40ml of 1M acid and put it into the conical flask. Next, I immediately put the bung, which was attached to the connecting tubes leading to the glass syringe, into the conical flask. ...read more.

Conclusion

This was due to the syringe not being adequate, because it was not suitable to measure the amounts of gas that we needed to measure, so my results were inaccurate. Although, the equipment did not suit our needs, the results came out, as I would have expected and they supported all of my background knowledge. None of the results were usual; I know this due to my pervious knowledge. My method could have been improved if I had measured the marble chips more accurately and the concentrations of acid, so that my results could be more reliable. My method could also be improved if the equipment that was available was more suitable and this would once again make my results more trustworthy. To provide any additional results, I would consider doing repeats to support my conclusion using sufficient equipment. I would also try other concentrations to gain more evidence to support my conclusion. Mandeep Landra Coursework - Chemistry October 2003 ...read more.

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