Qualification > Sciences
CHEMISTRY PAPER 1 HERE
aquarian93:
--- Quote from: madee on June 11, 2009, 02:59:57 pm ---
--- Quote from: aquarian93 on June 11, 2009, 02:57:39 pm ---and guys doesnt sodium oxide hav a pH above 7 (metal oxide)
den how cum the answer in nov 05, question 17 is C ???
--- End quote ---
it bcums dilute pH is lowered
--- End quote ---
but pH has nothing to do wid water and dilute Sad
plus its a metal oxide, the pH has to be above 7.
nid404:
--- Quote from: aquarian93 on June 11, 2009, 03:03:03 pm ---
--- Quote from: madee on June 11, 2009, 02:59:57 pm ---
--- Quote from: aquarian93 on June 11, 2009, 02:57:39 pm ---and guys doesnt sodium oxide hav a pH above 7 (metal oxide)
den how cum the answer in nov 05, question 17 is C ???
--- End quote ---
it bcums dilute pH is lowered
--- End quote ---
but pH has nothing to do wid water and dilute Sad
plus its a metal oxide, the pH has to be above 7.
--- End quote ---
Tell me what pH of water is
aquarian93:
--- Quote from: nid404 on June 11, 2009, 03:01:20 pm ---
--- Quote from: aquarian93 on June 11, 2009, 02:57:39 pm ---and guys doesnt sodium oxide hav a pH above 7 (metal oxide)
den how cum the answer in nov 05, question 17 is C ???
--- End quote ---
Read the question correctly. Sodium oxide, when in solution it forms OH-ions which give the pH for the solution and changes pH of water(7) to 12
Hence C
--- End quote ---
oh so da sodium oxide is added to the water. omg, stupid me
thanks nid :) as always, i say thanks to u, haha
+rep
girl_92:
--- Quote from: nid404 on June 11, 2009, 03:01:20 pm ---
--- Quote from: aquarian93 on June 11, 2009, 02:57:39 pm ---and guys doesnt sodium oxide hav a pH above 7 (metal oxide)
den how cum the answer in nov 05, question 17 is C ???
--- End quote ---
Read the question correctly. Sodium oxide, when in solution it forms OH-ions which give the pH for the solution and changes pH of water(7) to 12
Hence C
--- End quote ---
yea srry i rote it according to tht sodium i didnt read the que properly
girl_92:
can sum1 explain this que plz
Please help.....O/N 2007, paper 1, Q11
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