HELP! making 10.0mg/L potassium dihydrogen orthophosphate

[vlclabbie]

How does that work in grams of water to make 100ml ?

[RosalieM]

10mg/1000ml which is 1mg in 100ml

1mg = 0.001g in 100ml

What are you using it for?

[Voice]

Well Kel, if you have a balance that measure in milligrams, then the answer is 1mg/100ml. Pretty hard to do!
Your best bet is to make up the 10mg/L and only use 100ml. Sorry about that.
Maybe 1g.10ml, then 10ml of this + 90 ml water = 0.01g/100ml, then 10ml of this + 90ml of water = 10mg/L.
I think this is right.
Someone will tell us if this is correct.
Maree

[RosalieM]

Voice, I think you left out a 0 so it starts out as 1g in 100ml, not 1g in 10ml. Then continue as you said

1g/100ml => take 10ml, add 90ml water

= 0.1g in 100ml => take 10 ml, add 90ml water

= 0.01g in 100ml => take 10 ml, add 90ml water

= 0.001g in 100ml

[vlclabbie]

Thanks guys! For a Year 12 SAC....