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Investigating "Green Powder".

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Introduction

Investigating "Green Powder" Introduction The task in hand was to work out what the green powder really is, by running a series of experiments on it. Before the experiments began, we first had to look the container for any hazard signs, this one displayed the harmful sign, and thus meaning it should not be induced. After this, we came up with some questions, to which the answer would help us work out what the green liquid. These questions were: Will it dissolve in water? Does it dissolve in sulfuric acid (H4SO2)? What happens when the powder is heated over a Bunsen flame? With these questions in hand we set out to find the answer to each of them and thus find out what the green powder is. With it dissolve in water? Equipment 1 test tube 1 spatula 1 test tube rack Diagram Method First of all we took a test tube and filled it to 1/3 with water after which we added a spatula full of the green powder, and left in a test tube rack to see if it would dissolve. ...read more.

Middle

From experience, we were able to identify the solution as copper sulfate, thus telling us that if the sulfur and some, if not all of the oxygen came from the sulfuric acid then the green powder must contains copper to some level. What happens when you heat the powder over a Bunsen flame? Equipment 1 test tube 1 spatula 1 pair of tongs 1 Bunsen burner 1 pair of goggles Diagram Method First we put on our goggle incase something went wrong and the green powder shot off out of the test tube. Then we put a spatula of the green powder in a test tube. The test tube was then held with the tongs (to protect our fingers) and was then held in and out of the flame repeatedly (to slow the heating process and thus reduce the chance of accidents occurring) until we were satisfied that the heat had caused a change to occur. Results As the powder heated, it started to change colour from green to black. Also the particles of the powder started to vibrate violently, this is due to the heat going into the powder. ...read more.

Conclusion

Results The gas from the reaction traveled through the tube and into the test tube of lemon juice, which collected the gas. The gas then turned the lemon water misty, which means that the gas must be CO2 or carbon dioxide. From this, we can work out that if the carbon didn't come from the sulfuric acid (H4SO2), so therefore it must have come from the green powder. Conclusion From all the experiments carried out on the green powder, we were able to establish that the green powder contains copper, because it reacts with the sulfuric acid to make copper sulfate. Also we were able to establish that the green powder also contains carbon, because, when the powder reacts with the sulfuric acid, it gives of carbon dioxide. And finally, although it cannot be certain, the solution may contain oxygen, because in the heating experiment the powder may be giving off carbon dioxide, therefore leaving copper oxide. If all this is true, then from the results, the green powder must be Copper Carbonate (CuCO3). By Chris Oates 10TL/10A1 ...read more.

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