Topic 15 - Moles 2
No description yet. This curated deck is ready for daily study.
Card preview (5)
how do you calculate gas volume
volume = mass x 24 VOLUME IS dm3
How do you change cm3 into dm3
Divide by 1000
How do you calculate concentration?
moles Concentration = ———— (mol/dm3) volume
What is the point of titration practicals?
To measure moles in solutions Acid + alkali react in a fixed mole ratio
Describe the method for a titration practical
1) use a pipette and a puppeteer filler to place 25cm3 of alkali into a flask with 2-3 drops of indicator (NOT universal!) 2) fill a burette with acid (of a known concentration ) and note the initial volume - do this below eye level 3) add acid from the burette, swirling until the colour in the flask changes 4) note the final burette volume 5) the titre is the volume added form the burette 6) repeat until you have 3 sets of concordant results