French phrase
Quelle concentration faut-il pour ~ ?
Meaning
What concentration is needed for ___?
When to use it
Asks what concentration is needed for a process. Often used in chemistry or lab work.
Example dialogue
Quelle concentration faut-il pour que la réaction ait lieu ?
What concentration is needed for the reaction to take place?
Il faut au moins 0,5 mol par litre.
At least 0.5 mol per liter is needed.