Purity and formulations

Question 1

What is meant by purity?

Answer 1

A pure substance is something made up of just one element or compound.

Question 2

How can you test for ‘pure’ water?

Answer 2

Melting point is exactly 0 degrees celsius

Boiling point is exactly 100 degrees celsius

Question 3

How can you the melting or boiling point of a substance to determine it’s purity.

Answer 3

Measure its melting and boiling point.
Pure substance have an exact melting and boiling point.
Check if it is exact from the data books.

Question 4

What do impurities do to the substance’s properties.

Answer 4

Impurities lower the melting point and increase the melting range.
Impurities increase the boiling point and increase the range.

Question 5

What is a formulation?

Answer 5

Formulations are useful mixtures with a precise purpose. Each element is a measure quantity and contributes to the properties so that it can meet its required function.

Question 6

Give examples of formulations.

Answer 6

• medicinal drugs
• fertilisers
• fuels
• alloys
• food products
• cosmetics
• paints

Question 7

What do paint formulations consist of?

Answer 7

• Pigment: to give the colour.
• Solvent: to dissolve other components
• Binder: eg resin (polymer) holds pigment in place
• Additives: to change the physical and chemical properties.

Question 8

Why are formulations important in the pharmaceutical industry?

Answer 8

To make sure that pills..
digest in the correct part of body in the right conc
are able to dissolve or consumable
long shelf life.