Chemistry lab report Essay

* PurposeFinding the look of body of pissing gram moleculeecules attached to papal bull sulfate crystals CuSO4.xH2O.* To repress error1. Do non make too much front end around the balance when taking some(prenominal) plurality.2. Wait till the balances reading is stable then take aim the reading.3. Make sure that the crystals are well distributed in the beaker to be evenly unresolved to as much heat as possible.* In case the experiment was perennial for more accuracy in the concluding results, variables should be controlled1. subprogram the kindred balance.2. Use same size and shape of the container (Beaker or evaporating dish)3. Use exactly the same can of horseshit sulphate crystals.4. Apply the same amount of heat at the same time intervals.5. Control room temperature.* frame-up1. Beaker.2. Balance.3. Watching methamphetamine hydrochloride.4. Glass stirring rod.5. furious rest home.6. Tongs.7. Goggles.* Procedure1. The jalopy of the empty beaker is mensur able using the balance and set in motion to be 29.92g2. The mass of the ceremonial occasion rubbish is measurable using the balance and nominate to be 58.95g3. The slovenly person sulphate, which is a shed light on good-for-naught pulverisation, is then added to the beaker and the total mass of the beaker and the hog sulphate is 33.86g4. Wear the goggles for safety.5. horseshit sulphate is heated using the piquant plate, the color of the pulverise gradually changes from light blue to white starting from the laughingstock of the beaker up and weewee vapor bathroom be seen on the beakers walls.6. The pulverization becomes a little clumpy during heating.7. The beaker is shaken and the powder is stirred using the stirring crank rod every now and then to expose the upper parts of the powder to more heat and allow them to exsiccate properly.8. As soon as the immaculate powder turns white, the beaker is covered with watching film over to prevent sloven sulphate from re acting, again, with piss vapor in the atmosphere. Also, the hot plate is now turned off.9. The mass of the desiccate dogshit sulphate along with that of the beaker and the watching glass is now taken and found to be 91.60g.* Processing1. By subtracting the mass of the empty beaker measured at the root of the surgical procedure from its mass along with the copper sulphate, the mass of hydrated copper sulphate used at the beginning is found.33.86g 29.92g = 3.94g2. By subtracting the mass of the empty beaker and watching glass measured at the beginning of the procedure from the final mass of the procedure, the mass of desiccate copper sulphate is obtained.91.60g (58.95g + 29.92g) = 2.73g3. The mass of evaporated water system molecules can now be found by subtracting the mass of dehydrated copper sulphate from the mass of hydrated copper sulphate.3.94g 2.73g = 1.21g4. The subprogram of moles of evaporated water is now calculate by the rule flesh of moles = great deal / subm arine massWhere the molar mass of water is 18 g/moln = 1.21g / 18g.mol-1= 0.067 mol5. The number of water molecules is now calculated by multiplying the number of moles times Avogadros number (6.02*1023)Number of molecules = n*NA= 0.067*6.02*1023=4.03*1022 molecules6. The ratio is calculated to find the number of molecules attached and the pattern of the compoundCuSO4H2OMass (g)2.731.21Molar mass (g/mol)15918Number of moles (mol)0.1720.067 proportionality1100.393.9 4* finishingThe aim of this was to determine the number of water molecules attached to copper sulphate and that is a 4.03*1022 molecule where the compound has a construction of 10CuSo4.4H2O* Sources of error1. Uncertainty of the balance used.2. soul-stirring may cause crystals to stick on the stirring glass rod alter the mass.3. The beaker has a small surface stadium, then not all particles testament be exposed to enough heat and so not all water molecules impart evaporate.* Ways of improvingUse a container with a larger surface area such as an evaporating dish to avoid the need of stirring and therefore copper sulphate crystals wont be lost by sticking to the glass rod. Also, this will increase the number of water molecules exposed to heat and so it will increase the chance of dehydrating all of the copper sulphate crystals.