Quote:
|
Originally Posted by Xaccers
Didn't know where to put this so feel free to move it 
Here's something to frazzle your brains
You are provided with a solution containing 50ppm chloride ions. How many mls of this should be taken and diluted to produce 100ml of a 2.5ppm solution? |
ok ppm is mg/kg
you want 100mls or 0.1kg of solution with 2.5 mg/kg concentration - i.e. 0.25mg of chloride ion.
50ppm is 50mg of chloride ion per litre so you would take 0.005 ml of the original solution? (ignoring density effects
)