Qualification > Sciences
Chemistry Help HERE ONLY !!
Summer :]:
--- Quote from: islu_jf on May 29, 2009, 07:45:02 pm ---isnt there any other way??!
--- End quote ---
In a strong acid, all of the molecules when dissolved in water turn into ions
and in a weak acid not all of the molecules turn into ions
so you could simply dissolve them in water and use a Conductivity meter and measure there conductivity, if their conductivity is higher (due to the presence of more ions to carry the charge then it must be a strong acid)
if their conducitivity is pretty low (due to lack of ions then it must be a weak acid)
Summer :]:
--- Quote from: gonnagetana on May 27, 2009, 02:13:45 am ---thats interesting, i got a whole bunch of different answers
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Potassium Iodide is a reducing agent which means it brings about the reduction of others but itself is oxidised so for example you can test for it, by adding potassium manganate which is an oxidising agent it will bring about the oxidation of potassium iodide and itself will be reduced.
Potassium Manganate - will change from purple to colourless it has been reduced
Potassium Iodide - will change from colourless to orange because it has been oxidised to Iodine
OR...
when potassium iodide is added to hydrogen peroxide and sulphuric acid
the products will be iodine,potassim sulphate and water
H2O2 + 2KL + H2SO4 --> I2 + K2SO4 + 2H2O
you can note that hydrogen peroxide has been reduced (loses oxygen) and potassium iodide has acted as the reducing agent where it has been oxidised..
2I- ---> I2
(Colouless) to (red-brown)
My mum is a chemical engineer so she helps me alot with those kinda stuff :P :)
unknown 101:
--- Quote from: islu_jf on May 29, 2009, 07:40:43 pm ---How can u test if the acid is weak or Strong... ??
other than PH???
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a strong acid would completley dissociate in water
a weak acid partially dissociates in water
this could be used to define the term strong acid and weak acid
othr than pH u could do a reaction, maybe acid + alkali (nuetralization)
use same volume and conc. of alkali, and see which acid neutralizes the alkali the fastest
islu_jf:
ohhhhhhhhh i got it..
Thanx guys..
AS girl:
--- Quote from: sweetsh on May 29, 2009, 06:18:55 pm ---We don't need to know more than this about bond forming and breaking right?
--- End quote ---
This is the only thing u need to know about
Bond breaking=exothermic(negative)
Bond formation=endothermic (positive)
;)
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