C3: Concentration Flashcards
1
Q
what is concentration?
A
the amount of solute there is in a specific volume of the solvent.
2
Q
what is the equation for concentration in g/dm^3?
A
concentration = mass / volume
mass is in grams, volume is in dm
3
Q
how do you convert between cm^3 and dm^4
A
there are 1000 cm^3 in 1 dm^3
therefore, from cm to dm, divide by 1000. from dm to cm, multiply by 1000
4
Q
how do you find concentration in mol/dm^3?
A
concentration = moles/volume
5
Q
how do you convert from concentration in g/dm^3 to concentration in mol/dm^3?
A
multiply the conc. in mol/dm^3 by the Mr of the substance
6
Q
how to work out the concentration from an equation?
A
1 - work out mass of known substance
2 - use molar ratio to work out moles of unknown substance
3 - use moles to work out concentration
