Posted by **G** on Tuesday, July 6, 2010 at 11:42pm.

thanks Dr.Bob, I got that question. I also have another question that I am having trouble on.

I am being asked to arrange the oxides in each of the following groups in order of increasing basicity:

(a) K2O, Al2O3, BaO

(b) CrO3, CrO, Cr2O3

I know the answers are (a)Al2O3 < BaO < K2O and (b) CrO3 < Cr2O3 < CrO but I do not understand why these are the answers. How do you get these answers?

Thanks

- chemistry -
**DrBob222**, Tuesday, July 6, 2010 at 11:58pm
I look at the acid strengths. Two rules you can remember is that acidity increases from left to right in the periodic table (due to electronegativity) in the same row and from top to bottom in the same column (due to size). So the left side elements (oxides in this case) form stronger bases and the right side oxides form stronger acids. For oxoacids, the stronger acid belongs to the compound (same central element) with more oxygen atoms; i.e., HClO < HClO2 < HClO3 < HClO4.

H2SO3 < H2SO4

HNO2 < HNO3

etc.

## Answer This Question

## Related Questions

- Chemistry - 1.Arrange the following oxides in the order of increasing basicity...
- quick algebra question - When asked what quadrant the coordinate (0,0) is in, ...
- Chemistry - Arrange the following oxides in order of increasing acidity: As2O5, ...
- chemistry - Arrange the following oxides in order of increasing acidity: P2O5, ...
- CHEM- KINETICS - The rate constant for a reaction is 4.65 L mol-1s-1. The ...
- Records Management - I am having a hard time understanding how to arrange these ...
- Bob Pursley - Bob: Thank you for answering my Chemistry question. I apologize ...
- Intro Chemistry - I am reviewing my test and I having trouble figuring out the ...
- Math - f(x)=3x^2-x-2 If x=2, what is f(x)? What point is on the graph of f? For ...
- AlgebrAlgebra-Mathmate or BobPursley or Reiny - I had asked a question earlier ...

More Related Questions