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Started By
Message
1
Posted on 12/7/15 at 9:15 pm to vjp819
Get a salinity meter and add fresh water until it reads what you want.
Posted on 12/7/15 at 9:34 pm to FutureMikeVIII
quote:
I think it's ~63 gal, too. I think everyone that is saying 1.5 gal is assuming the fresh water has s.g. of 0 instead of ~1.
I think the correct equation is:
C1V1 + C2V2 = C3V3
You really think it would take 63 gallons , or 20% of the current volume, to change the water SG by 0.005 kg/l?
Posted on 12/7/15 at 9:39 pm to Bmath
When the water you're adding only has a difference of 0.03 kg/L...yes.
Explain my mistake, I'm all ears.
Explain my mistake, I'm all ears.
This post was edited on 12/7/15 at 9:41 pm
Posted on 12/7/15 at 9:54 pm to Bmath
Let x be the amount of water you need to add.
[315/(315+x)]*(1.03)+[x/(315+x)]*(1.00)=1.025
Multiply both sides by (315+x)
315*1.03+x*1.00=1.025(315+x)
324.45+x=322.875+1.025x
.025x=1.575
x=63 gallons
[315/(315+x)]*(1.03)+[x/(315+x)]*(1.00)=1.025
Multiply both sides by (315+x)
315*1.03+x*1.00=1.025(315+x)
324.45+x=322.875+1.025x
.025x=1.575
x=63 gallons
Posted on 12/7/15 at 9:56 pm to FutureMikeVIII
Because C1V1 + C2V2 = C3V3 is used when combining two solutions to make a third. C1V1 = C2V2 is the correct dilution equation. That comes out to be ~1.5 gal.
Posted on 12/7/15 at 10:04 pm to Bmath
quote:
Because C1V1 + C2V2 = C3V3 is used when combining two solutions to make a third.
That's exactly what we're doing here, Einstein.
C1 = 1.03 g/mL
V1 = 315 gal
C2 = 1.00 g/mL
V2 = ?
Posted on 12/7/15 at 10:16 pm to FutureMikeVIII
quote:
That's exactly what we're doing here, Einstein.
No need for the ad hominem attack. Besides, didn't Einstein fail a math course growing up?
quote:
C1 = 1.03 g/mL
V1 = 315 gal
C2 = 1.00 g/mL
V2 = ?
You're not diluting with, you are diluting to. So, my argument is this:
C1 = 1.03 g/mL
V1 = 315 gal
C2 =1.025 g/mL
V2 = 315.54 gal
Posted on 12/7/15 at 10:20 pm to LucasP
quote:
Shut the frick up, rock nerd. He asked about chemistry, not what a vagina doesn't feel like.
...one of the greatest posts in tiger droppings history was a better version of that joke.
Posted on 12/7/15 at 10:29 pm to Bmath
quote:
No need for the ad hominem attack
Your laughing at my correct answer made me salty...couldn't help myself.
Anyway, you're diluting with pure water with a density of 1.0 g/mL to get to water with a density of 1.025 g/mL.
So,
C1 = 1.03 g/mL
V1 = 315 gal
C2 = 1.00 g/mL
V2 = ?
C3 = 1.025 g/mL
V3 = V1 + V2
C1V1 + C2V2 = C3V3
Since we're actually talking about density, not concentration, the dilution water has a non-zero mass that must be taken into account.
Posted on 12/7/15 at 10:36 pm to TigerFanatic99
63 gal brah. 315 gal * 1.03 + x = 1.025 * (315 gal + x)
Solve for x.
Solve for x.
Posted on 12/7/15 at 10:41 pm to LSUsuperfresh
Yeah I'm going with 63. You're talking a pretty significant change honestly.
Posted on 12/7/15 at 10:49 pm to FutureMikeVIII
quote:
Your laughing at my correct answer made me salty...couldn't help myself.
Fair enough
quote:
Anyway, you're diluting with pure water with a density of 1.0 g/mL
Right, which is what I always assume with making dilutions in the lab. Perhaps what I'm not looking at is I generally am looking to dilute based on percentage. Density is a form of concentration, but it has specific units. Therefore, I could see how the other equation would be more correct. However, it seems odd to me that it would take a full order of magnitude difference in water to make a 0.005 g/mL change.
Posted on 12/7/15 at 10:50 pm to LSUSUPERSTAR
This should work
This post was edited on 12/7/15 at 11:11 pm
Posted on 12/7/15 at 11:34 pm to FutureMikeVIII
quote:
C1 = 1.03 g/mL
V1 = 315 gal
C2 = 1.00 g/mL
V2 = ?
C3 = 1.025 g/mL
V3 = V1 + V2
C1V1 + C2V2 = C3V3
Since we're actually talking about density, not concentration, the dilution water has a non-zero mass that must be taken into account.
The chemist in me agrees with all of this. The units of mL and gallons are bothering me even though there wouldn't be a difference in the calculation
ETA: Where's the update??
This post was edited on 12/7/15 at 11:35 pm
Posted on 12/11/15 at 8:12 pm to TigerFanatic99
Well...
What was the result?!
What was the result?!
Posted on 12/11/15 at 8:52 pm to Pectus
Why don't they just buy a house that's already painted?
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