Analysis of Brick cleaner Aim Essay Example for Free

Analysis of Brick spotless Aim EssayTheory/Hypothesis The main agent in brick cleaner is HCL and must be diluted and titrated with a base to be able to analyse it. It reacts with parts of the concrete which allows it to remove the concrete from the bricks. I think there will be around 30% of HCL in brick cleaner.Materials5mL brick cleaner100mL, 0.1M basisard sodium carbonate solution250ml de-ionised pissing supplyMethyl chromatic indicator250mL volumetric flask4x100mL conical flasksSmall funnel10mL step cylinder* 20mL pipette* Pipette filter* Dropping pipette* burette and standWhite tileElectronic balanceSafety glassesGlovesMethod1) A 250 mL volumetric flask was weighed with its mass recorded2) A 10mL measuring cylinder was used to pour 5mL brick cleaner into the volumetric flask. The flask was stoppered straight after all the brick cleaner was in the flask.3) The flask was then reweighed4) De-ionised water was added until the flask was about half full. The flask was sto ppered and shaken carefully upside down several times.5) More water was added to the flask about a cm below the graduation line. A dropper was used to accurately drop the right amount of water to the flask so the bottom of the meniscus was on the graduation line.6) A 20mL pipette was used to put 20mL of sodium carbonate solution into each of the four 100mL conical flask. 3 drops of methyl orange indicator was added to each.7) The burette was filled with the solution of brick cleaner.8) The sodium carbonate solution was titrated with the solution of brick cleaner until there was a clear permanent colour change.9) locomote 7 and 8 were repeated until 3 concordant results wereResultsWeightVolumetric flask78.968gBrick cleaner6.00gTitre123Initial vol2.323.43.0 last-place vol23.444.524.0Vol added21.121.121.0CalculationsOn page attached.DiscussionThe weight for the brick cleaner may not be 6.00g as the volumetric flask was not weighed again with the brick cleaner in it because that step w as forgotten. So the result above was taken from another student that did the prac. This will affect the results as the mass of the brick cleaner is used to determine the plowshare by mass of HCL in brick cleaner.All 3 titres show that they are only within 0.1 of each other. The hypothesis has been disproved because it was suggested the 30% of HCL would be in brick cleaner and theres only 2.4% although its not certain that those steps were done correctly. There were no problems encountered during this prac.Focus Questions8)a) the manufacturer says that brick cleaner is made up of around 35% HCL, which is a massive difference to the answer that was got in this prac but again question 7 was not done correctly.b) differences in class results occur because not everybody would drive home done the exact volume of brick cleaner, sodium carbonate etc as each other therefore the difference in results obtained.9) To correctly clean up a spill of 20mL brick cleaner you would mop it up immedi ately, washing it away with massive amounts of water10)a) volumetric flask= once with water twice with brick cleanerb) Burette= once with water twice with diluted solution of brick cleanerc)pipette= once with water twice with diluted brick cleanerd) conical flask=once with water twice with sodium carbonate solutionConclusion To conclude, there should be 35% HCL in brick cleaner although it was found that there was only 2.4%.