Week 3

Question 1

Explain concentrations

Answer 1

The abundance of a constituent of a mixture divided by the total volume of the mixture

Question 2

Explain molar concentration ( c )

Answer 2

• Is the number of moles of a solute divided by the volume of the
  solution
• It is measured in mol/L, and an example would be 2 moles of salt in 1 L water

Question 3

Explain mass concentration (p)

Answer 3

• The amount of the solute (typically in g) divided by the volume
  of the solution
• It is measured in g/L, and an example would be 5g of salt in 1 L water

Question 4

Explain volume concentration (ϕ)

Answer 4

• Is the volume of solute (typically in ml) divided by the volume
  of the solution
• It is measured in ml/L, and an example would be 5 ml bleach in 1 L water .

Question 5

Explain what 1 molar solution means

Answer 5

• The concentration of the s-n is 1 mol/L, i.e. 1mol of
  the substance is dissolved in 1L s-n
• The units are mol/L or M

Question 6

Explain whatA 3 millimolar solution means

Answer 6

• That the concentration of the s-n is 3 mmol/L (3mM), i.e.
  3mmol of the substance are dissolved in 1L s-n

Question 7

What does 1M s-n conclude

Answer 7

1M s-n = 1 mol / litre
1M s-n= 6.022 x 10^23 particles / litre
1M s-n = molecuar weight in gram / litre

Question 8

What is the formula for concentration

Answer 8

c = n/v

Question 9

How many particles in one mole

Answer 9

6.022 x 10^23

Question 10

What does per cent mean

Answer 10

Percent means parts per hundred

Question 11

What does ppm mean

Answer 11

ppm means parts per million

Question 12

What is the equation for molar concentration ( c )

Answer 12

c = n/v ( mol / L )

Question 13

What is the equation for mass concentration ( p )

Answer 13

p = m/v ( g / L )

Question 14

What is the equation for volume concentration (ϕ)

Answer 14

(ϕ)i = Vi / V ( mL / L )

*** i is the solute