Moles and Concentrations

Question 1

To calculate mass

Answer 1

N (no. of moles)= m(mass in g)/Da (molar weight)

Question 2

Why to we measure in moles

Answer 2

To find the amounts of substance in a concentration

Question 3

How to find No. of moles/ con

Answer 3

C (con) = N (no. of moles)/volume (L)

Question 4

What is log 10?`

Answer 4

1

Question 5

How to conjugate a base?

Answer 5

to find the acid of a base: add a proton

to find the base of an acid: take a proton

Question 6

Example

Answer 6

Acid Base
HCl- Cl-
H3O+ H20

Question 7

When can water dissociate?

Answer 7

Water can disassociate when the covalent partnerships are disrupted resulting in hydronium and hydrox. ions

Question 8

How can you measure the acidity of a solution?

Answer 8

How many H30+ ions or H+ are present –> to measure the pH scale

Question 9

What does the pH scale tell you?

Answer 9

It tells you how many hydronium ions have dissociated from water to become apart of a hydronium ion (10 fold change)

Question 10

Acidic solution?

Answer 10

A solution with a high con. of H+ ions and an low pH value

Question 11

Basic solution?

Answer 11

A solution with a low con. of H+ ions and a high pH value

Question 12

What does an acid do?

Answer 12

It donates a proton

Question 13

What does a base do?

Answer 13

It accepts a proton

Question 14

What do strong and weak acids in water?

Answer 14

Strong acids completely dissociate in water, weak acids dissociate partially in water

Question 15

What is the normal pH level for humans?

Answer 15

7.4

Question 16

What are buffers?

Answer 16

Buffers absorb (accept) and release (donate) protons. This requires the hydronium ion concentration in systems and reduces the overall changes in the molarity of hydronium in a system