Analysis of Brick Cleaner Essay

Aim To find the percentage by fold of hydrochloric acid present in brick washed by doing an acid-base titration.Theory/ guess The main ingredient in brick dry- sweeted is HCL and must be cut and titrated with a base to be able to meditate it. It reacts with parts of the concrete which allows it to remove the concrete from the bricks. I think there go out be around 30% of HCL in brick unstained.Materials* 5mL brick spic* 100mL, 0.1M standard sodium carbonate solution* 250ml de-ionised body of water* Methyl orange tree forefinger* 250mL volumetrical flaskfulful* 4x100mL conic flasks* Small funnel* 10mL measuring cylinder* 20mL pipette* Pipette filter* drop pipette* Burette and stand* dust coat tile* Electronic balance* precaution glasses* GlovesMethod1) 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 later all the brick cleaner was in the flask.3) The flask was then reweighed4) De-ionised water was added until the flask was closely half full. The flask was stoppered and jolted carefully upside down several(prenominal) times.5) More water was added to the flask close to a cm below the gradation line. A dropper was used to accurately drop the right amount of water to the flask so the bottom of the semilunar cartilage was on the graduation line.6) A 20mL pipette was used to put 20mL of sodium carbonate solution into each of the four 100mL cone-shaped 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 perm colour change.9) Steps 7 and 8 were repeated until 3 concordant results wereResults freightVolumetric flask78.968gBrick cleaner6.00g titer123 sign vol2.323.43.0Final vol23.444.524.0Vol added21.121.121.0CalculationsOn page attached. pa sswordThe 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 was forgotten. So the result above was taken from another student that did the prac. This leave alone affect the results as the mass of the brick cleaner is used to determine the percentage by mass of HCL in brick cleaner. All 3 titres show that they are only indoors 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 real that those steps were through with(p) correctly. There were no problems encountered during this prac.Focus Questions8)a) the manufacturer says that brick cleaner is make 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 crystalize results occur because not everybody would have done the exact volume of brick cleaner, sodium carbonate etc as each other consequently the difference in results obtained.9) To correctly clean up a spill of 20mL brick cleaner you would mop it up immediately, washing it past with massive amounts of water10)a) volumetric flask= in one case 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 name that there was only 2.4%