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can someone please help me ! abt the accuracy questions that they always ask abt the burrette and pipete . and mass ... i always get mixed up
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its like the error in burette or pipette is half the least count. The least count of burette is 0.1cm^3 so the error is +- 0.05. bt since we take an initial n a final value to get a titre, we multiply the error by 2 i.e +-0.1.can someone please help me ! abt the accuracy questions that they always ask abt the burrette and pipete . and mass ... i always get mixed up
its like the error in burette or pipette is half the least count. The least count of burette is 1cm^3 so the error is +- 0.5. bt since we take an initial n a final value to get a titre, we multiply the error by 2 i.e +-1.
Same applies to thermometers.
in pipette u dont multiply it by 2 since u just measure 1 final volume
its like the error in burette or pipette is half the least count. The least count of burette is 0.1cm^3 so the error is +- 0.05. bt since we take an initial n a final value to get a titre, we multiply the error by 2 i.e +-0.1.
Same applies to thermometers.
in pipette u dont multiply it by 2 since u just measure 1 final volume
oh im gladthank uu for the helpp ! thanks god they ddnt bring it hard anywayzz abt the errorss i did great in todays exam el7amdellah
plz upload photoI'll upload some pictures as soon as I get my journal from the school, explaining how to draw the tables and write the observations.
Well the uncertainty depends on how big of a value you are finding but I think what you want to ask is the error in a stop watch.What's the uncertainty of a stop watch?
This is going to be a little hard to explain but this is how it works, you(Student) are supposed to take the standard uncertainity in timers. The examiner on the other hand takes extra for human error because there's a huge chance you will get it on a stopwatch. So basically you need to think that you didn't make any human error due to reaction times, so you will just take the error that is due to the stopwatch itself, the examiner will take care of the errors caused by your reaction times.MindStealth, don't you take the uncertainty of a stopwatch to be equivalent to the value of human reaction time error? Which is 0.2-0.4s I believe... because I've seen this in a number of marking schemes for physics practicals. Wouldn't the same apply for chemistry? :/
This is going to be a little hard to explain but this is how it works, you(Student) are supposed to take the standard uncertainity in timers. The examiner on the other hand takes extra for human error because there's a huge chance you will get it on a stopwatch. So basically you need to think that you didn't make any human error due to reaction times, so you will just take the error that is due to the stopwatch itself, the examiner will take care of the errors caused by your reaction times.
Errm... It is .1 cm^3, talking about burette least count... Which makes the error ± .05 cm^3 for any individual value...
Its so hard to decide the uncertainities of different instruments, Can I get them all for all the instruments to be used in labs?^0.2
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