chem. not homework!?

Question

A pH of 9 is a stronger base than a pH of 8.
true
false


What is the pH of a solution with a 0.007 H3O+ concentration?
2.15
–2.15
7.00
–7.00


What is the pOH in question 11 above?
–7.00
2.15
11.85
–11.85


On the pH scale, which of these listed below is the strongest acid (the most acidic)?
6.0
2.4
3.6
1.1


A crystal of copper sulfate is added to a copper sulfate solution. After 20 minutes, the crystal is observed to be unchanged at the bottom of the solution. On the basis of this observation, the solution is best described as
supersaturated
dilute
saturated
unsaturated

What is the formula of hydroiodic acid?
HIO4
HI
H2
H2IO3

A substance, like water, that can act either as an acid or a base is
polyprotic
neutral
amphoteric
anhydrous

What is the pH of a solution with a hydroxide ion concentration of 0.00200 M? (Hint: Find the pOH using your calculator first, then find the pH).
2.00
11.3
12.0
2.30

Answer 1

1. True. A pH 9 base is actually 10 times stronger than a pH 8 base.
2. 2.15 pH = -log [H+]
3. pOH = 11.85 pOH = 14 - pH
4. 1.1 Strongest acid will have the lowest pH.
5. Saturated. Were the solution dilute or unsaturdated, the crystal would have dissolved.
6. HI. H2 is hydrogen, HIO4 is periodic acid, and I'm not sure what H2IO3 is.
7. amphoteric. Polyprotic is an acid that can give more than one H+ to water (like H2SO4), neutral means neither acidic or basic, and anhydrous means dry.
8. 11.3

Answer 2

true.

2.15

11.85

1.1

saturated?

HI

amphoteric

11.301