HELP! making 10.0mg/L potassium dihydrogen orthophosphate
Posted: 22 Mar 2010, 10:43
How does that work in grams of water to make 100ml ?
10mg/1000ml which is 1mg in 100ml
1mg = 0.001g in 100ml
What are you using it for?
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HELP! making 10.0mg/L potassium dihydrogen orthophosphate
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Re: HELP! making 10.0mg/L potassium dihydrogen orthophosphate
Posted: 22 Mar 2010, 10:59
Re: HELP! making 10.0mg/L potassium dihydrogen orthophosphate
Posted: 22 Mar 2010, 11:02
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
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
Re: HELP! making 10.0mg/L potassium dihydrogen orthophosphate
Posted: 22 Mar 2010, 11:16
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
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
Re: HELP! making 10.0mg/L potassium dihydrogen orthophosphate
Posted: 22 Mar 2010, 21:12
Thanks guys! For a Year 12 SAC.... 