Quantitative Chemistry

Question 1

What the equation for concentration? mol/dm3

Answer 1

Amount / volume

Question 2

What does a metal reacting with an acid give?

Answer 2

A salt and an acid

Question 3

What are moles?

Answer 3

the amount of a substance in a unit

Question 4

How do you do percentage yield?

Answer 4

Actual yield / theoretical yield

Question 5

How do you do atom economy?

Answer 5

Mr of products / Mr of reactants

Question 6

What’s titration?

Answer 6

Use the pipette and pipette filler to add a measured volume of sodium hydroxide solution to a clean conical flask.
Add a few drops of indicator and put the conical flask on a white tile.
Fill the burette with hydrochloric acid and note the starting volume.
Slowly add the acid from the burette to the alkali in the conical flask, swirling to mix.
Stop adding the acid when the end-point is reached (when the indicator first permanently changes colour). Note the final volume reading.
Repeat steps 1 to 5 until concordant titres are obtained. More accurate results are obtained if acid is added drop by drop near to the end-point.