Qualification > Sciences
CHEMISTRY PAPER 1 HERE
esso:
but ur user name is nid rite... dats why i said nid...
nid404:
Let’s first consider the ions present
H+ OH-
Na+ Cl-
what exactly happens in the solution when electricity is passed through
The negative electrode(cathode) attracts the Hydrogen ions are attracted to it. They accept electrons to form hydrogen gas(which does not produce any change in the indicator)
At the positive electrode(anode), chloride ions are attracted. Here they lose two electrons to form chlorine gas. The chlorine bleaches the indicator.
The ions remaining form sodium hydroxide but the color change to blue is observed at the other electrode only because at the anode the indicator is bleached.
Ask again if u don't understand
john12345:
--- Quote from: nid404 on June 10, 2009, 03:59:35 pm ---Let’s first consider the ions present
H+ OH-
Na+ Cl-
what exactly happens in the solution when electricity is passed through
The negative electrode(cathode) attracts the Hydrogen ions are attracted to it. They accept electrons to form hydrogen gas(which does not produce any change in the indicator)
At the positive electrode(anode), chloride ions are attracted. Here they lose two electrons to form chlorine gas. The chlorine bleaches the indicator.
The ions remaining form sodium hydroxide but the color change to blue is observed at the other electrode only because at the anode the indicator is bleached.
Ask again if u don't understand
--- End quote ---
oh allright got it thanx a lot nid. really nice of u to help
one more thing so de hydrogen formed at cathode doesnt affect de indicator becoz its as gas nd not as H+ ions,is dat de reason why de hydrogen gas has no effect on de indicator???
also so de sodium hydroxide is formed everywhere however it only affects the cathode region, because at the anode the litmus paper is bleached.. is dat rite
so if de litmus paper had not been bleached den even at de anode the litmus paper would have turned blue??
nd before chlroine turns damp blue litmus paper white it first turn the damn blue litmus paper red rite?? y is dat
nd one more question will sulphur dioxide gas react weith sodium hydroxide.. if yes what are the products
+ rep for u. Thanks a lot for ur help. hope im not wasting too much of ur time
which country r u from??
Petrol:
can u please help me.. i kinda suck at chemisty but i heard this was a CORE paper is that true?
if it is where can i find CORE notes so i can study from them?
nid404:
--- Quote from: Petrol on June 10, 2009, 04:24:13 pm ---can u please help me.. i kinda suck at chemisty but i heard this was a CORE paper is that true?
if it is where can i find CORE notes so i can study from them?
--- End quote ---
i don't think u can get notes specifically for the core syllabus. Ull have to co-relate the matter in ur text or guide with the core syllabus
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