[SOLVED] Arrange the following aqueous solutions, all at 25 C in order of decreasing acidity?

Arrange the following aqueous solutions, all at 25 C in order of decreasing acidity?

pH = 5.45

pOH = 8.55

.0023 M HCl

.0018 M KOH

Please help i’m so lost in class, any explanation would be greatly appreciated!

Answer:

I think this is the correct answer for Arrange the following aqueous solutions, all at 25 C in order of decreasing acidity?

Knowing 2 things, lower pH, stronger acid. Low as in around 1-3 on pH scale, now this is easy.

KOH…in water it becomes K+ and OH-. OH- is a STRONG base, very high pH.

pOH = 14-pH. So pOH = 8.55 means pH = 5.45, same as the other

KOH

Just did this, the correct answer is, in the order of most acidic to most basic:

0.0023 M HCl

ph = 5.45

pOH = 8.55

0.0018 M KOH

This guy is right, except the pH=5.45 and the pOH=8.55 are equal to each other so they re placed on top of each other.

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