I have completed a chapter on gas calculations and have now calculated answers for two previous chapters. Find the answers on the last page of each chapter.

1.21 moles and formulae now has answers

1.23 Gas Calculations new but no answers yet

1.24 calculations and chemical reactions now has answers

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LilyMy teacher told me that sensitivity error for burette is 0.05

for balance is 0.005

for volumetric flask is 0.2

for pipette is 0.06

so which is right? Is it even necessary to learn them?

chemrevisePost authorThese are not numbers you would generally need to learn. AQA use a value of 0.15 for using a burette, this includes an initial reading and final reading Plus interpreting the endpoint.

In general the sensitivity value is half the value of the smallest scale division the equipment can make

LilyMakes sense! Thank you so much!

LilySorry but for burette does it also depend on how many concordant results you have so say if you have four concordant results would sensitivity error be (0.05×4)/average titre?

chemrevisePost authorNo this does not follow because each titration has the same error so the the average of the concordant results would be the same as one of them

JohnnyWill you be uploading any A2 chapters any time soon? They look really good.

chemrevisePost authorI’ve started work on them again after a break but I think it will be AS ones that appear soonest