[Minerva Scriptor]

Being in honors Chemistry, I was intelligent enough to leave my notes at school, and now have to figure out how to finish my homework through the internet. 

Anyway, I need to predict the acidic or basic nature of several different anhydrides (CaO, CO2, Na2O, NO, SO3, and Rb2O)
I have a feeling this is pretty simple, but I have know idea how it is done.

For another question, I have to find the pH, pOH, (H+), and (OH-) of .00015 M HNO3.
I came up with

(H+) = .00015
pH = 3.82
pOH = 10.18
(OH-) = 6.607x10^-11

Is this correct?  it seems too easy.

[Rabn]

Have you considered equilibrium?

[Minerva Scriptor]

No, do you think I should? 

Never mind, I'm pretty sure my teacher mentioned we wouldn't be including equilibrium until next week.

[Borek]

Anyway, I need to predict the acidic or basic nature of several different anhydrides (CaO, CO2, Na2O, NO, SO3, and Rb2O)
I have a feeling this is pretty simple, but I have know idea how it is done.

Try to write reaction equations for all thes substances with water.

For another question, I have to find the pH, pOH, (H+), and (OH-) of .00015 M HNO3.
I came up with

(H+) = .00015
pH = 3.82
pOH = 10.18
(OH-) = 6.607x10^-11

Is this correct?  it seems too easy.

Almost OK. Even taking equilibrium into account won't change this result much, solution is so diluted HNO₃ is completely dissociated. Two things: you sure it is not 6.667 in the last number? And remember about correct number of significant figures in your answers.