The color of the solid was doted. The capped bottle was then taken into the analytical room and its mass was accurately measured. Then, the copper (II) sulfate was transferred from the bottle into a casserole. The empty bottle With lid was reweighed using the analytical balance. The purpose of this procedure is to accurately determine the mass of copper (II) sulfate and to eliminate the risk of spilling chemicals in the analytical room. After that, the casserole dish was heated using a hotplate until the powder turns into pale blue color.
It is advised not to heat it strongly o prevent it to start blacken. For normal case, a settling of 3-4 for about 20-25 minutes should provide sufficient heating. Next, the crucible was removed from the hotplate and allowed to cool for around 2-3 minutes, The contents was then transferred back into the weighing bottle and recapped. The solid was made sure to be transferred as much as possible into the weighing bottle as the mass would have direct bearing on the calculations.
The capped weighing bottle which now contains dehydrated copper (II) sulfate was accurately weighted, Finally, he copper (II) sulfate was disposed into the waste container in fume hood. The results are tabulated under Table below. Results Table 1. 0 Mass and Moles of Copper (II) Sulfate Mass of capped weighing bottle t hydrated (blue) copper (II) sulfate 42. Gag Mass of empty (capped) weighing bottle 41. Gag Mass Of hydrated copper (II) sulfate Mass of capped feigning bottle + dehydrated (white) copper (II) sulfate I 42. Gag Mass 1 0. Gig Moles of white copper (II) sulfate 0. Moll I Moles of water | I Moles of water/Moles of copper (II) sulfate | 4. 613 Mass of dehydrated copper (II) sulfate = Mass of capped weighing bottle + dehydrated (blue) copper (II) sulfate – Mass of (capped) weighing bottle empty = (42. 0651-41. 3832)g = 0. Gag Mass Of water = hydrated (blue) copper (II) sulfate – dehydrated (blue) copper (II) sulfate = (0. 9991 – 0. 6759)g = 0. Gag Moles of white copper (II) sulfate = 0. Gag – 0. Moll Moles of water 0. Gag (ex.+16)g/mol = 0. Moll Moles of water/Moles of copper (II) sulfate = 0. Momma 10,Moll 4. 619 Part B: Dilution of Colored Solution Aim: The objective of this experiment is to determine the change in concentration upon dilution of stock solution. The materials used in this experiment are Potassium Permanganate, beaker, pipette, pipette filler, dropper, CACM volumetric flask, water, covets cell and ultraviolet-visible spectrophotometer. First, no more than CACM of the colored solution (Potassium Permanganate) provided are collected using a beaker. Then, CACM of the solution was transferred into a CACM standard volumetric flask using a Comic pipette.