Quantitative analysis

Question 1

Concentration.

Answer 1

• As concentration increases the solute particles become more crowded.
• If a solution is three times diluted; it will take up three times more volume.

Question 2

How to make a 1.0 mol/dm³ solution into 0.1dm³ solution.

Answer 2

To make 1.0 mol/dm³ solution into 0.1dm³ solution you need to take 100cm³ of the solution and add 900 cm³ of water.

Question 3

How to convert cm³ to dm³.

Answer 3

÷1000

Question 4

How to convert dm³ to cm³.

Answer 4

x1000

Question 5

Volume Unit

Answer 5

dm³

Question 6

Concentration Unit

Answer 6

mol/dm³

Question 7

amount in moles with conc.

Answer 7

= concentration x volume

Question 8

Concentration Eq.

Answer 8

= amount in moles/volume

Question 9

Volume Eq.

Answer 9

= amount in moles/concentration

Question 10

Food Labels

Answer 10

The government has introduced the colour coded ‘traffic light’ system for food labels showing the types of food such as sugar, salt, and fat and their quantities. The labels also give the percentage of the guideline daily amounts of these foods.

Question 11

Sodium ions.

Answer 11

• Sodium ions are essential in our diets for water balance and nerve responses, but too much can cause high blood pressure and high blood disease.
• The main source of ions is salt
• Food labels need to be with care. Some list the amount of ‘sodium’, others the amount of ‘salt’.
• Prepared foods usually contain other sodium compounds in small quantities, so that sodium ions must be counted as well.