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h99h20baby
Joined: 01 Jul 2007
Posts: 40
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 Posted: Tue Jul 17, 2007 9:40 pm Post subject: Question 12 |
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Regarding the statement:
Using Kb = ([X ][OH-])/[XOH]; X is most probably a Group I metal since no decomposition occurred (P3, L3-4), implying that the anion (OH-) and cation (X ) are of comparable size (P2, L1-4)......
how do you know that no composition occurred? Regards |
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admin
Site Admin
Joined: 08 Dec 2003
Posts: 2176
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| Posted: Thu Jul 19, 2007 10:48 am Post subject: |
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P3, L3-4 refers to paragraph 3, lines 3-4 in the passage states regarding the unknown salt:
"It did not decompose to the oxide." |
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jgarcia_65002
Joined: 20 Jul 2010
Posts: 1
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| Posted: Fri Jul 30, 2010 7:25 pm Post subject: |
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| I got confused becaused the first Group I metal hydroxides, LiOH, NaOH and KOH have pkb values ranging from -.3 to .5 since they are strong bases. How can these strong bases have a pkb value of 6? When i saw the question, I assumed complete dissociation of the base and got a ph of 14. |
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