C5 - Concentration, Dilution and GDA

Question 1

What is the difference between dilute and concentrated solutions?

Answer 1

A very concentrated solution will contain relatively large numbers of solute particles.

Question 2

How do you convert between cm3 and dm3?

Answer 2

• to go from cm3 to dm3, divide by 1000
• to go from dm3 to cm3, multiply by 1000.

Question 3

What is the triangle for concentration?

Answer 3

Mole
__________
Concentration x Volume (dm3)

Question 4

Why is dilution important in science?

Answer 4

Scientists need to dilute substances accurately so that they can carry out tests on them. If the concentration is too low or too high, their machines may give an inaccurate reading, or may not even detect the substance.

Question 5

How do you work out the volume of water to add to a concentration to get it to a different concentration?

Answer 5

( Starting concentration )
(________________________) -1 x starting volume
(Target concentration )

Question 6

Why is too much salt bad?

Answer 6

It can cause health problems including high blood pressure, leading to an increased risk of heart disease.

Question 7

What other sources can sodium ions come from apart from salt?

Answer 7

Monosodium glutamate, commonly used to enhance the flavour of food, contains sodium ions.