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Decompose copper carbonate by heating and measure the amount of gas produced.

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Introduction

Chemistry Investigation Introduction: To find out the correct formula, I will need the aid of an experiment. I will have to decompose the copper carbonate by heating and measure the amount of gas produced. The volume of gas will help me determine which equation is correct. Method: 1. Set up the apparatus as shown below. 2. Measure out 0.25g of copper carbonate to the nearest 0.01g, remembering to turn the scales after placing the container in which to hold the copper carbonate. 3. Put the copper carbonate into a conical flask and attach a bung, which has a tube protruding from it, so that the rubber tube can be attached easily. 4. Attach the tube connected to the bung by a rubber tube, which is connected to the end of the glass syringe. 5. Make sure that the apparatus is fully connected so that the gas won't leak out. Place conical flask on top of the tripod and turn on the Bunsen burner. 6. Leave the Bunsen burner on until the syringe end stops moving, because reaction has finished therefore no more gas will be produced. ...read more.

Middle

+ CO (g) According to this equation, 1 moles of CuCO will produce 1 mole of gas. So the ratio of copper carbonate to gas is 1:1, to make both set of calculations become equal I am doubling the amount of copper carbonate, therefore the new ratio will be 2:2. To determine the amount of 2CuCO to use so that I will get a sensible amount of gas, I'm going to work out the weight of 1 mole of 2CuCO and use this to work out how much gas the reaction will produce: 2CuCO = 2(63.5+12+(16x3)) =247 This number can be rounded up to 250g as such a slight difference between the real mass and the mass used here won't make a big difference. 1 mole of gas will take up 24000cm� under standard conditions. If 250g of 2CuCO is used (250/250=1 mole of 2CuCO ) the amounts of gas produced will be: Equation 1- 2:21/2 volume of gas produced 21/2x24000=60000cm� Equation 2- 2:2 volume of gas produced 2x24000= 48000cm� This much gas is far too much to be collected in a normal experiment and the equipment needed is too difficult to find, so I will reduce the amount of 2CuCO . ...read more.

Conclusion

Clamp- to hold syringe in place. Rubber tubing is used as it is flexible and can create an airtight seal connecting the conical flask and syringe. Spatula- used for measuring out the amount of copper carbonate. Goggles- used for safety Experimental errors: � The leakage of gas, however many precautions you take under normal circumstances, can't ensure that there will be no leakage of gas. Some of the gas will escape. � The syringe is not totally accurate and there may be some human error whilst the syringe is being read, also it may be difficult to judge when exactly the gas will have cooled down and it may not have cooled down in 5 minutes. � The weight of the CuCO measured may not be totally accurate as it is measured to the nearest 0.01g. � The Bunsen burner may be turned off too quickly if it seems as if the reaction has stopped because the movement of the cylinder end has slowed down so much it seems to have stopped. Safety Precautions: An apron must be worn as well as goggles. Also the tripod must not be touched straight after the experiment as it may still be hot and may cause burns. ...read more.

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