2.6 Solutions and pH

Question 1

Concentration

Answer 1

The amount of substance in a defined space

Question 2

pH

Answer 2

Potential of hydrogen, used to measure the amount of hydrogen ions in a substance

Question 3

pOH

Answer 3

Potential of hydroxide, used to measure the amount of hydroxide ions in a substance

Question 4

Hydroxide Ion

Answer 4

A negatively charged molecule made up of one oxygen bonded to one hydrogen

Question 5

Hydronium Ion

Answer 5

A water molecule that bonded to a positively charged hydrogen ion

Question 6

Acid

Answer 6

Has a pH of 1-6, has more hydrogen ions than hydroxide ions

Question 7

Base

Answer 7

Has a pH of 8-14, has more hydroxide ions than hydrogen ions

Question 8

When given one of the variables (pH, pOH, [H3O+], [OH-]), how do you find the other three?

Answer 8

pH+pOH=14
[H3O+], [OH-]= 10^-14

Question 9

How do you decide if a substance is an acid, base, or neutral given the pH or pOH?

Answer 9

If it’s in pOH, subtract it from 14 to get it into pH. If the pH is 7, it’s neutral. If it’s from 1-6, it’s an acid. If it’s from 8-14, it’s a base.

Question 10

How do you decide if a substance is an acid, base, or neutral given the [H3O+] or [OH-]?

Answer 10

If it’s in [OH-], subtract the power from -14 to get it into [H3O+]. Then take that power and drop the negative sign. That’s the pH. If the pH is 7, it’s neutral. If it’s from 1-6, it’s an acid. If it’s from 8-14, it’s a base.

Question 11

If solutions have two different pH.s, how will the