How to Screw Up your Practical, Part Two

had my first pharmaceutical analysis lab today.

task: to do 2 limit tests on... whatever ion (i think sulphate) on some KMnO4.

let me see if i remember:

procedure:
1) standard soln: put 15 + 1.5 ml of standard sulphate soln + 1 ml of BaCl2 solution into big fat test tube. add 15 drops (5ml) of some strong acetic acid.
the test soln should not be more cloudy than this in order to meet BP stds..

2) test soln: weigh 0.75g of KMnO4 solid using weighing balance and add 25 ml of water and 3 ml of alcohol into the thing, stir. then put on hot surface until the thing boils and turns brown, then wait for about 2-3 minutes. then wait for the thing to cool down (aid cooling if necessary), then filter the shitlike mess, get 12ml of filtrate add 3 ml of water and to this 15ml:
add 1.5 ml of standard sulphate soln + 1 ml of BaCl2 solution into big fat test tube. add 15 drops (5ml) of some strong acetic acid.

sounds easy? haha.. then can someone explain to me why my water levels of both test and std solns were always different. stupid. redid one experiment because of that. so i did 3 expts in all, running out of time, with the 3rd one under the close scrutiny of Dr Koh and Dr Chan and all the lab techs. think they must have noticed i was in close time trouble, treating me like a VIP: "are you ok? can you manage? is everything all right? do u need help in cleaning up?" arrghh. not that i don't appreciate but it's really darn paiseh and shitty la. lang bei as they say in chinese. just feel like abandoning the whole darn thing but somehow, i just went on.

then as Dr Koh was explaining to me some stuff and asking me which test tube had the more opalescent solution and suddenly my carebears ringtone came on!!!! ARGGH!! immediately balls shrink!! then checked. nuan. omg. but think she (Dr Koh) smiled a bit too so nothing. lolz. so paiseh!!!! shit man. lesson: never to put corny ringtones on your phone. and silent the darn phone in practicals.

i'd said i'd screw up the first practical in every module:
ppda: went in half-asleep.
physical pharm: was doing with some girl. got alot of help along the way.
dispensing II: almost died.

shall sleep early today.