Quantitative Chemistry

Question 1

What is the concentration of a solution?

Answer 1

It is a measure of how much of a substance is dissolved in a known amount of water

Question 2

Triangle of calculating concentration

Answer 2

Moles
Concentration Volume

Question 3

How to change concentration from g/dm3 to mol/dm3

Answer 3

Concentration in mol/dm3 X RFM

Question 4

How to record results when carrying out a titration?

Answer 4

Results from the titration should be recorded to one decimal place.
Titration should be repeated for reliability until two results between 0.2cm3 are obtained.

Question 5

What is titration?

Answer 5

A method of reacting two solutions together to determine the number of moles of the solute is one of the solutions

Question 6

Another way to calculate concentration in g/dm3

Answer 6

Mass of solute(g) divided by volume

Question 7

What is molar gas volume?

Answer 7

Volume of one mole of gas under specified conditions of temp and pressure e.g. 24dm3 at 20 degrees and one atmosphere pressure

Question 8

Equation for molar gas volume

Answer 8

Moles = gas volume divided by molar gas volume

Question 9

What is avogadro’s law?

Answer 9

Equal volumes of gases under the same conditions of temp and pressure contain the same number of particles.
E.g. if 1 mole of a gas has a volume of 24dm3 at room temp and pressure then 2 moles will have a volume of 48dm3

Question 10

What is atom economy?

Answer 10

Is a measure of how efficiently the atoms in the reactants are used and converted to the desired product in a chemical reaction

Question 11

How to calculate percentage of atom economy?

Answer 11

Mass of desired product divided by sum of masses of all products X 100