Analysis of Brick Cleaner Essay

Aim To adjust the percentage by view of hydrochloric acid present in brick spick by doing an acid-base titration.Theory/Hypothesis The main ingredient in brick tidy is HCL and must be diluted and titrated with a base to be adequate to analyse it. It reacts with parts of the concrete which allows it to remove the concrete from the bricks. I signify there will be about 30% of HCL in brick urine-washed.Materials* 5mL brick dry-cleaned* 100mL, 0.1M standard atomic number 11 change declaration* 250ml de-ionised body of pissing* Methyl chromatic tree indicator* 250mL volumetric flaskful* 4x100mL conical flasks* Small funnel* 10mL metre cylinder* 20mL pipette* Pipette filter* Dropping pipette* burette and stand* White tile* Electronic balance* Safety render* GlovesMethod1) A 250 mL volumetric flask was weighed with its throne recorded2) A 10mL measuring cylinder was used to pour 5mL brick spic into the volumetric flask. The flask was stoppered straight after all the bri ck cleaner was in the flask.3) The flask was then reweighed4) De-ionised water was added until the flask was about half(a) full. The flask was stoppered and shaken carefully upside down several(prenominal) times.5) More water was added to the flask about a cm at a lower place the graduation line. A dropper was used to accurately drop the in force(p) 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 individually 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 chroma change.9) Steps 7 and 8 were repeated until 3 concordant results wereResults ladingVolumetric flask78.968gBrick cleaner6.00gTitre123Initial vol2.323.43.0Final vol23.444.524.0Vol added21.121.121.0Calc ulationsOn 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 was 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 percentage 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 only if again question 7 was not done correctly.b) differences in score results occur because not everybody would have done the exact volum e 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 draw it up immediately, 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%