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Chemistry Help HERE ONLY !!
Roza:
--- Quote from: ManaH on May 25, 2009, 10:05:09 am ---
--- Quote from: Roza on May 25, 2009, 10:01:21 am ---
--- Quote from: ManaH on May 25, 2009, 08:39:12 am ---I need help in chemistry oct/nov 08 second varient paper
Q 7ai)
--- End quote ---
i actually got this question for my mocks
here's the working
volume of oxygen left
according to question according to equation
1 mol 6.5 mol
if 20cm3 x??
so 20 x 6.5 = 130cm3
150-130 = 20cm3
so volume of oxygen left = 20cm3
volume of carbondioxide formed
1 4
20 x??
so 20 x 4 = 80
volume of carbondioxide formed = 80cm3
--- End quote ---
Thankyou but wont we use the formulaa???
n umm why did u subtracted it form 150?
--- End quote ---
no there is no need to use a formulae
n oxygen is in excess n we want to find the volume of oxygen left at the end of experiment
so 150-130= 20
MaNa:
--- Quote from: Roza on May 25, 2009, 10:12:06 am ---
--- Quote from: ManaH on May 25, 2009, 10:05:09 am ---
--- Quote from: Roza on May 25, 2009, 10:01:21 am ---
--- Quote from: ManaH on May 25, 2009, 08:39:12 am ---I need help in chemistry oct/nov 08 second varient paper
Q 7ai)
--- End quote ---
i actually got this question for my mocks
here's the working
volume of oxygen left
according to question according to equation
1 mol 6.5 mol
if 20cm3 x??
so 20 x 6.5 = 130cm3
150-130 = 20cm3
so volume of oxygen left = 20cm3
volume of carbondioxide formed
1 4
20 x??
so 20 x 4 = 80
volume of carbondioxide formed = 80cm3
--- End quote ---
Thankyou but wont we use the formulaa???
n umm why did u subtracted it form 150?
--- End quote ---
no there is no need to use a formulae
n oxygen is in excess n we want to find the volume of oxygen left at the end of experiment
so 150-130= 20
--- End quote ---
alright thankyou
+ rep for u ;D
Aishath:
hey everyone...
can someone explain to me titration briefly cos i am not really gud at topic..
Thanks
nid404:
Titration
An accurately measured volume of a solution is normally placed in a conical flask and the other in a burette. The solution from the burette is added slowly until the solution in the flask has completely been used up by the reaction. This is shown by the use of an indicator. The volume of the solution used can then be read off the burette scale.
This technique is most commonly used for acid-base reactions
Aishath:
thanks nid404!!!
great explanation!!! i understood it well....
+ rep for u! ;)
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