Maximizing Safety and Accuracy in Titration: Tips for Volumetric Analysis

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The discussion centers around the challenges of performing titration in a chemistry practical, specifically the requirement to mouth pipette, which many find difficult for achieving precise measurements. Participants express frustration over the outdated practice of mouth pipetting, highlighting safety concerns and the risk of contamination or injury. Some suggest techniques for obtaining accurate titre values, such as overfilling the pipette and adjusting to the mark, while others point out that not all regions have access to safer alternatives due to economic constraints. The conversation reflects a broader issue of safety and resource availability in educational settings worldwide, emphasizing that while some may view safety equipment as essential, it can be considered a luxury in less affluent areas.
smart_worker
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guys today i have my chemistry practicals.i have to do titration.i have to suck the pipette with my mouth.it is a rule that everyone must use their mouth only.it is very difficult for me to suck in exact 20ml of the solution and pipette out.so i am not getting the exact titre value.are there any shortcuts to find the titre value.
 
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You don't "suck exactly 20 mL". You suck more, use your finger to close the pipette, then you let the excess to drop out till the pipette is filled exactly to the mark.
 
Utterly ridiculous that in 2014 people are still being taught to mouth pipette. I thought this practice was prohibited almost everywhere.
 
gravenewworld said:
Utterly ridiculous that in 2014 people are still being taught to mouth pipette. I thought this practice was prohibited almost everywhere.

Sorry to say that, but you are just showing your ignorance - not every part of the world is rich enough.
 
smart_worker said:
are there any shortcuts to find the titre value.

You can't decide the concentration of a solution while looking at it. And you are not allowed to do more than that. One shortcut is to get to know the titre value first!
In my case the error was always due to leftover distilled water in the flask. It diluted the pipetted solution and I purposely used to take 0.1mL less than the observed titre value. It worked well for me!
 
Borek said:
Sorry to say that, but you are just showing your ignorance - not every part of the world is rich enough.

Yup, so expensive :rolleyes:

http://www.sciencelabsupplies.com/Pipette_Filler_Red.html


If you can afford to do chemistry, afford chemicasl, afford to have a lab, and afford glassware you can afford minor safety items that can prevent major injuries. Hey mouth pipetting, what a great way to get hepatitis or oral acid/base burns!
 
You are still not understanding the reality - this kind of safety is considered a luxury in many places. When GDP per capita is 50 times lower than in US, $5 is a serious expense.

And - without getting into details - OP doesn't live in US.
 

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