Chapter 13 - Quantitative chemistry 2

Question 1

whats the equation to find the concentration of a substance ?

Answer 1

conc = mass (g) / volume (dm^3)

Question 2

What s the triangle to do with moles, conc and volume ?

Answer 2

moles

conc volume

Question 3

What is a titrations used for ?

Answer 3

they are a very accurate experimental technique of determining the volume of solutions that react together.

Need to use an indicator e.g phenolphalein

Question 4

What apparatus is used in a titration ?

Answer 4

• Burette
• pipette
• conical flask
• white tile

Question 5

Why would you repeat the titration ?

Answer 5

to improve the reliability of the results

Question 6

What is the titre ?

Answer 6

The volume of solutions added from the burette

Question 7

What is the volume of 1 mole of gas at room temperature and pressure ?

Answer 7

24 dm^3

Question 8

What does avragado’s law state ?

Answer 8

equal volumes of gases at the same temperature and pressure contain the same number of particles /molecules

Question 9

What is the triangle to do with 24, moles and volume ?

Answer 9

volume

24 moles

Question 10

Whats the equation for atom economy ?

Answer 10

mass of desired product
————————————- x 100
total mass of products

Question 11

Why is high atom economy important ?

Answer 11

• less waste is produced

- more profitable