Acidity of oxides

Steven12 · 24 Jul 2004, 7:54 AM

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Hi people

you know how acidity of oxides decrease across the group from left to right
basic to acidic

wat i dont understand is

since group 2 elements can have oxidation state of +2

eg Ba(OH)2 wouldnt barium oxide be more basic that KOH?(cos it has 2 OH)

but basicity decrease going across the groups so its confusing

can so can someone clear that up?

xiao1985 · 24 Jul 2004, 8:27 AM

i think it is more referrin to metal oxides are general basic whereas non metal ( those towards the right hand side of the periodic table) are generally acidic...

Tommy_Lamp · 24 Jul 2004, 8:47 AM

yer i think xaio is right

**CM_Tutor** · 25 Jul 2004, 2:20 AM

I agree - I'd treat it more as a generalised description that a strict rule.

Take period 3, for example:
Basic oxides on the left (Na₂O, MgO)
then amphoteric (Al₂O₃) and 'neutral' (SiO₂)
then acidic (P₂O₅, SO₃, Cl₂O₇)

24 Jul 2004, 7:54 AM	#1 (permalink)
Steven12 Lord Chubbington HSC: 2004 Gender: Male Location: sydney Join Date: Mar 2004 Posts: 409 Last Activity: 20 Nov 2009, 9:53 AM	Acidity of oxides You can hide this advertisement by registering. Hi people you know how acidity of oxides decrease across the group from left to right basic to acidic wat i dont understand is since group 2 elements can have oxidation state of +2 eg Ba(OH)2 wouldnt barium oxide be more basic that KOH?(cos it has 2 OH) but basicity decrease going across the groups so its confusing can so can someone clear that up? __________________ SL

24 Jul 2004, 8:27 AM	#2 (permalink)
xiao1985 duckie's REBORN!!!!! ^^ HSC: 2003 Gender: Male Location: pond... where the ducks are Join Date: Jun 2003 Posts: 5,742 Last Activity: 17 May 2009, 2:11 PM	i think it is more referrin to metal oxides are general basic whereas non metal ( those towards the right hand side of the periodic table) are generally acidic... __________________ DUCKIE IS REBORN!!!!! only 3 wks too earlie =S "I am willing to give up any thing for you... even maths!!!!" - anonymous "Don't cry because it ended; smile because it happened." - anonymous

24 Jul 2004, 8:47 AM	#3 (permalink)
Tommy_Lamp Coco HSC: 2004 Gender: Undisclosed Location: Northern Beaches Join Date: Jun 2004 Posts: 1,748 Last Activity: 1 Dec 2006, 11:48 AM	yer i think xaio is right __________________

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25 Jul 2004, 2:20 AM	#4 (permalink)
CM_Tutor Teacher Join Date: Mar 2004 Posts: 1,293 Last Activity: 22 Oct 2004, 12:23 AM	I agree - I'd treat it more as a generalised description that a strict rule. Take period 3, for example: Basic oxides on the left (Na₂O, MgO) then amphoteric (Al₂O₃) and 'neutral' (SiO₂) then acidic (P₂O₅, SO₃, Cl₂O₇)