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Arrange the following oxides in order of increasing acidity.
Rank from least acidic to most acidic. To rank items as equivalent,overlap them.
CaO
P2O5
SO3
SiO2
Al2O3
CO2

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Answer:

Based on the Modern Periodic table, there is an increase in the electropositivity of the atom down the group as well as increases across a period. On comparing the electropositivities of the mentioned oxides central atom, it is seen that Ca is most electropositive followed by Al, Si, C, P, and S is the least electropositive.  

With the decrease in the electropositivity, there is an increase in the acidity of the oxides. Thus, the increasing order of the oxides from the least acidic to the most acidic is:  

CaO > Al2O3 > SiO2 > CO2 > P2O5 > SO3. Hence, CaO is the least acidic and SO3 is the most acidic.  

akposevictor

Since acidity increases across a period from left to right, and decreases down a group, the oxides can be ranked from the least acidic to the most acidic as follows:

[tex]\mathbf{CaO < Al_2O_3 < SiO_2 < CO_2 < P_2O_5 <SO_3}[/tex]

  • The least acidic is CaO
  • The most acidic is [tex]SO_3[/tex]

Note the following:

  • Acidity of an oxide depends on its electronegativity.
  • Non-metals are more electronegative, while metals are less electronegative.
  • Acidity of oxides increases across a period as you move from left to the right side of a periodic table.
  • Acidity of oxides decreases down a group (column) in a periodic table.

Using the periodic table diagram given in the attachment below, we can rank the given oxides according to their increasing acidity.

  • CaO, is the least, because it is an oxide of the metal, Calcium, which is at the far left in group 2 in the periodic table.

  • The next is, [tex]Al_2O_3[/tex]. Aluminum is a metal from group 3.

  • [tex]SiO_2[/tex] is an oxide of Silicon, also in group 4 but below Carbon.

  • [tex]CO_2[/tex] is an oxide of Carbon, from group 4.

  • [tex]P_2O_5[/tex] is an oxide of the non-metal, Phosphorus, a group 5 element

  • [tex]SO_3[/tex] is an oxide of the non-metal, Sulphur, a group 6 element.

Therefore, since acidity increases across a period from left to right, and decreases down a group, the oxides can be ranked from the least acidic to the most acidic as follows:

[tex]\mathbf{CaO < Al_2O_3 < SiO_2 < CO_2 < P_2O_5 <SO_3}[/tex]

  • The least acidic is CaO
  • The most acidic is [tex]SO_3[/tex]

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