# Which Equation is Correct? Essay

Task: This experiment consists of the decomposition of copper mineral carbonate where we want to identify whether CuO(? ) or Cu20(s) is upon the decomposition of copper carbonate when heated. I plan to use mole equations to get the volume of gas produced in equally equations in order to solve the challenge set.

Equation 1 – 2CuCO3(s) Cu2O(s) + 2CO2(g) + 1/2O2 Equation two – CuCO3(s) CuO(s) + CO2(g) Utilizing the formula for moles plus the volume of gas, I i am able to foresee the volume of gas produced before I have actually executed the try things out. Equipment and Reagents 5. Tripod and Mat 5. Bunsen Burner and Rubberized Bung * Boss and Clamp Stand * 100ml Conical Flask * 100cmï¿½ Graduated Gas Syringe 5. Weighing Size (ï¿½0. 01g) *? g of copper carbonate ( The mass will be made the decision later on because we are restricted to 100cmï¿½ amount of gas in the syringe. Background Information Copper carbonate is a green solid when ever reacted.

When it decomposes upon warming a colour differ from green to black is going to occur. Amedeo Avagadro figured out that one particular mole of the substance is the amount of substance which will contains several elementary entities (atoms, elements, electrons or ions) as there are in accurately 12. 000g of Carbon-12. This is six.

02 back button 10ï¿½ï¿½. Considering that the atomic mass in grams of all factors contains six. 02 by 10ï¿½ï¿½ atoms, we label 6. 02 x 10ï¿½ï¿½ atoms of the element as 1 skin mole. * Let me calculate a suitable mass which should be used by making use of the mole equations (see later on). 2. This suitable mass should never produce a lot more than 100cmï¿½ amount of gas. * This can then be decomposed by the temperature from the Bunsen burner.

2. We will certainly continuously heat the copper carbonate right up until no more gas is created. Once you can forget gas is definitely produced I will know that every one of the CuCo3 features decomposed. 2. Once there is not a more gas entering the syringe plus the syringe has stopped going. I will allow the gases to cool to room temp for about your five – 10 minutes because once heated, gas tend to grow, which may affect my results. * Let me make the copper carbonate in powder to boost its area and thus raising the rate of reaction. 5. I will be able to obtain even more readings inside the time period and so a more specific average may be produced.

Figuring out the Mass of CuO to use, and the volumes of gas produced. Equation 1 – 2CuCO3(s) Cu2O(s) + 2CO2(g) + 1/2O2 5. If I would have been to use 1g of CuCO3, I can estimate the number of moles, using the method: Moles sama dengan Mass/R. Farrenheit. M = 1/(63. your five + 12 + (16 x 3)) = 1/123. 5 sama dengan 0. 008moles * I wish to find out the volume of gas in the syringe for this formula to be appropriate, so I must use the skin mole ratio plus the formula pertaining to the volume of gas to work it out: 2CuCO3(s) Cu2O(s) + 2CO2(g) + 1/2O2 Mole percentage: 2: one particular: 2: zero.

5 2CO2: The ratio is the same as 2CuCO3, therefore the skin moles is also equal to 0. 008 moles. Volume of Gas = Moles back button 24dmï¿½ = 0. 008 x twenty-four = 0. 190dmï¿½ or (x1000) = 190cmï¿½ 1/2O2: The ration is a .25 of the skin mole ratio, and so the moles to get oxygen is usually: =0. 008/4 = 0. 002 moles Volume of gas = Skin moles x 24dmï¿½ = zero. 002 x 24 = 0. 048dmï¿½ or (x1000) = forty eight. 0cmï¿½ 2. The total amount of gas in the syringe therefore would be: 190cmï¿½ + forty eight.

0cmï¿½ sama dengan 238. 0cmï¿½ * This can be a problem as the gas syringe cannot carry this quantity of gas. * Easily were to multiply the total gas by 3/10 we would receive 71. 4cmï¿½total volume of gas. * This means that if we grow the mass by 3/10, we would get 0. 30g of birdwatcher carbonate. * Thus, I will use 0. 30g of copper carbonate, and if this value developed a volume that was less than 100cmï¿½ in the second equation: Equation 2 – CuCO3(s) CuO(s) + CO2(g) Moles sama dengan Mass/R.

N. M = 0. 30/(63. 5 & 12 + (16 back button 3)) sama dengan 0. 30/123. 5 = 0. 00243 moles CuCO3(s) CuO(s) & CO2(g) Skin mole Ratio you: 1: you Therefore the skin moles of CuO is 0. 00243 skin moles.

Volume of Gas = Skin moles x 24dmï¿½ = 0. 00243 times 24 sama dengan 0. 0583dmï¿½ or (x1000) = fifty eight. 3cmï¿½ 2. In conclusion, I will use zero. 30g of copper carbonate and when it decomposes, in the event the total amount of gas produced can be 71.

4 cmï¿½ then this reaction obeys equation you, and forms Copper(II) O2. * Yet , if fifty eight. 3cmï¿½ of gas can be produced then the reaction obeys the formula 2, and forms Copper(I) Oxide. Precision of Equipment and Reagents 5. All my benefits have been directed at 3 significant figures aside from the mass of copper carbonate, which can be given to a couple of decimal locations because the range can only measure to installment payments on your d. g. Graduated Gas Syringe, Mass and Selection: Equation 1 – 2CuCO3(s) Cu2O(s) + 2CO2(g) & 1/2O2 2. This formula will generate 71. 4cmï¿½ of gas.

The syringe, which gathers the gas has an reliability to the nearby decimal place, ï¿½0. 5cmï¿½. Therefore the percentage error is usually: * (ï¿½0. 5/71. 4) ï¿½ 95 = 0. 70%.

2. The range in the gas syringe allows ideals between 71. 3

67% plus the scale enables values among 0. 29g

Formula 2 – CuCO3(s) CuO(s) + CO2(g) * This equation can produce 49. 3cmï¿½ of gas. The syringe, which will collects the gas, comes with an accuracy for the nearest quebrado place, ï¿½0. 5cmï¿½. The proportion error can be: * (ï¿½0.

5/58. 3) ï¿½ 75 = 0. 86%. 2. The range from the syringe permits values between 58. two

86% + 1 . 67% = installment payments on your 53% * This indicates why these errors will be insignificant and should not affect the results. 5. I think that this is the least error possible, because in case the copper carbonate is certainly not pure, then simply we will not develop these outcomes and the accuracy and reliability. Precision * To make sure that We produce exact results, I intend to do it again the try things out several times until I achieve consistent effects.

Safety 2. Lab clothes must be donned during the experiment. * Eye protection must be put on at all times. 2. Make sure that you certainly not using virtually any faulty products. * Be sure that the gas syringe movements smoothly as well as its slider will not get stuck when collecting the gas, which will boost the pressure applied on it, causing it to break. * Allow the experiment to cool prior to clearing up mainly because if the conical flask is usually washed quickly then it can break plus the equipment will be very hot. Bibliography * “Chemistry 1” backed by OCR * “AS Level Chemistry” by David Atkinson and Carol Hibbert * “Chemistry In Context” by Graham Hill and John Holman