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Determining the correct equation for the composition of Copper Carbonate

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Introduction

Determining the correct equation for the composition of Copper Carbonate Which Equation is Correct? Copper Carbonate, CuCO3 decomposes on heating to form one of these oxides and an equation 1. CuCO3(s) --> CuO + CO2(g) Or 2. 2CuCO3(s) -->Cu2O(s) + 1/2 O(g) the experiment that should be carried out to determine which equaton is correct is as follows. Aim The purpose of this experiment is to determine the correct equation 1 or 2 from above. This will be done by measuring the amount of gas given off. Apparatus 1) Conical flask (250Cm3) 2) Glass delivery tube with attached rubber bung 3) Measuring cylinder (250Cm3) 4) Water trough 5) Water 6) Bunsen burner 7) Heatproof mat 8) ...read more.

Middle

7) Now make sure that the delivery tube is directley underneath the measuring cylinder. If it is proceed on to point 7 if not rectify the situation before moving on. 8) Turn on and light the bunsen burner. Turn the air hole at the bottom of the bunsen to make a blue flame, but not roaring. 9) Record the amount of gas given off by the amount of water that had been displaced. 10) Now repeat the whole experiment again, but replace the CuCO3 with 2CuCO3 and record yet again the amount of water displaced/gas given off. Calculations To work out which equation is correct ideas about the mole must be applied, as so.... CuCO3 --> CuCO + CO2 mass volume moles moles In step 1 the equation n = m M must be applied...... ...read more.

Conclusion

4.048x10-3mols x 1.25 1 = 5.06x10-3moles 3. 5.06x10-3mols x 48dm3 = 0.243dm3 4. 0.243dm3 x 1000 = 243cm3 This is because... CuCO3 --> CuCO + CO2 1 mol --> 1mol 1mol --> 24dm3 2mol --> 48dm3 OR 2CuCO3 --> Cu2O + 2CO2 + 1/2 O2 2 mol --> 2 1/2 mol 2mol --> 60dm3 So after carrying out the experiment you will be able to look at the amount of gas given off and decide from that "which equation is correct." If the water displaced is around 243cm3 it is going to be the 2nd equation that is correct 2CuCO3 --> Cu2O + 2CO2 + 1/2 O2 If the water displaced is around 194.33cm3 it is the 1st equation that is correct CuCO --> CuO + CO2 * note some of the volumes cannot be read as accurately, as given in these calculations, off of the measuring cylinder. The nearest number should be taken. ...read more.

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