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January 18, 2026, 02:57:35 am

Author Topic: need help claryfying my answers for this titration question!!!!!!!!  (Read 6201 times)  Share 

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MagicGecko

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Hi
Ok so this is a question that will be related to a SAC I have next week and I would just like to know if my explanations are right…if not can you please explain!!!

A student titrated an aliquot of standard sodium carbonate solution with hydrochloric
acid in a burette. State whether the concentration determined for the hydrochloric acid
would be likely to be higher, lower or unchanged compared with the actual value if
the student had previously washed with water, but not dried, the following apparatus:

a the pipette used to deliver the aliquot of sodium carbonate solution
b the flask containing the aliquot
c the burette.

These are my answers:
a)   Well I thought that since the pipette has not been cleansed of water, the volume of Na2CO3 would be smaller than what you thought you had. And since you had a smaller volume of Na2CO3 you would need a much larger amount of HCl to match the volume ratio. HIGHER
b)   I think that it doesn’t matter how much water there is in the flask, as long as the volume of Na2CO3 is precise, than the concentration of HCl would be normal. UNCHANGED
c)   …….I had an answer to this but then I scratched it out because I thought that the concentration depends on the volume but I remembered what my teacher said “it doesn’t matter how much of a volume you have, the concentration will always be the same”. So umm….can someone please explain this to me???

PLEASE THANK YOU!!!
 
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