Water Quality B/C

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Re: Water Quality B/C

Post by personasaurus rex » March 25th, 2012, 6:23 pm

Doesn't CaCO3 not even dissolve at room temperature? How could they make a solution out of a nonsoluble salt?
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Re: Water Quality B/C

Post by sazhassan » March 25th, 2012, 6:24 pm

quizbowl wrote:
sazhassan wrote:yeah. It's in the Water Quality Wiki though...
No, that's Wastewater treatment. There is a fine line between the two.
oh never mind... i have potable water treatment in my notes... i think it was soinc.org then. srry.
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Re: Water Quality B/C

Post by PacificGoldenPlover » March 25th, 2012, 6:25 pm

Good point.
Maybe silentsage meant SODIUM carbonate, which does dissolve.
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Re: Water Quality B/C

Post by 2win » March 25th, 2012, 7:44 pm

So it IS possible for them to use something other than NaCl? But would that mean that calibration would have to be different for each salt or no.. Am I like, overthinking this...
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Re: Water Quality B/C

Post by sazhassan » March 26th, 2012, 11:01 am

2win wrote:So it IS possible for them to use something other than NaCl? But would that mean that calibration would have to be different for each salt or no.. Am I like, overthinking this...
you may be.... since our state only gave us multiple choice... which was really weird... there was no salinometer or anything else... :|
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Re: Water Quality B/C

Post by lolliexdd » March 26th, 2012, 4:17 pm

I hope this hasn't been answered yet..

We've been having problems building a salinometer like the one they recommended we make, with a straw and clay. Every day that we test any of our salinometers (we've used 3 types of clay already) in tap water, they all float to a different line than the day before. We've even used deionized water instead of tap water to calibrate it, but we still have the same problem. Do any of you know how to fix this?
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Re: Water Quality B/C

Post by 2win » March 26th, 2012, 6:24 pm

lolliexdd wrote:I hope this hasn't been answered yet..

We've been having problems building a salinometer like the one they recommended we make, with a straw and clay. Every day that we test any of our salinometers (we've used 3 types of clay already) in tap water, they all float to a different line than the day before. We've even used deionized water instead of tap water to calibrate it, but we still have the same problem. Do any of you know how to fix this?
Try distilled instead of deionized water...
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Re: Water Quality B/C

Post by lolliexdd » March 26th, 2012, 6:53 pm

2win wrote:Try distilled instead of deionized water...
Aren't they the same?
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Re: Water Quality B/C

Post by ptkid » March 26th, 2012, 7:06 pm

lolliexdd wrote:I hope this hasn't been answered yet..

We've been having problems building a salinometer like the one they recommended we make, with a straw and clay. Every day that we test any of our salinometers (we've used 3 types of clay already) in tap water, they all float to a different line than the day before. We've even used deionized water instead of tap water to calibrate it, but we still have the same problem. Do any of you know how to fix this?
Okay, so when I tried making that one it just doesn't work. The soinc.org people are just wrong. A simple straw and clay model cannot be that accurate and can easily break. You need to think more sophisticated like how you can make it more accurate. Experiment to get a good salinometer.


And they basically are the same (deionized and distilled water).
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Re: Water Quality B/C

Post by 2win » March 26th, 2012, 8:14 pm

lolliexdd wrote:
2win wrote:Try distilled instead of deionized water...
Aren't they the same?
My understanding is that deionized water may still have some dissolved gases and such in it.... distilled water is pure water with no gasses or other particles/substances.

But yeah, the soinc one is pretty crappy. A team at my regionals made one last minute because they left theirs at home, and so... Yeahh, they didn't really get a good reading...
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