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Reload this Page calibration solution around the house?
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Old 01-13-2009, 12:35 PM
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Default calibration solution around the house?
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i was just wondering if there is a calibration solution for checking ppm laying around the house and don't now it, kind of like using a nickel to check scales...+rep
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Old 01-13-2009, 01:41 PM
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Not really that I can think of.. Well distilled water is a safe 7.0, and tomato juice is usually pretty close to 4.1-4.2, but theres no point in going beyond droplet tests if you're going to calibrate like that..
I'll look into possible solutions using distilled water and common pills or something else standardized/replicable though..
There is a hole in your bucket for a diy solution though given the fact that you need a trustworthy reading to calibrate a solution to calibrate your meter..
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Old 01-13-2009, 01:44 PM
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Distilled vinegar 5% is exactly ph2.5 no matter what brand. Its what I have always used.
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Old 01-13-2009, 02:37 PM
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Vinegar isn't anymore trustworthy than tomato juice (usually 2.4-2.6), and its pH is further from our range..
The best place to ask would probably be sciencemadness.org, but don't talk about anything drug related there!
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Old 01-13-2009, 11:59 PM
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sorry, i should have been more clear...i was mainly talking about ppm..
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Old 01-14-2009, 02:29 AM
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Oh salt and distilled water then works pretty well.. 1.00g/L works out to 1000ppm and it scales.. IIRC, correlating EC to NaCl ppm in DH2O is the norm..
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Old 01-14-2009, 07:37 AM
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Quote:
Originally Posted by born2killspam View Post
Vinegar isn't anymore trustworthy than tomato juice (usually 2.4-2.6), and its pH is further from our range..
The best place to ask would probably be sciencemadness.org, but don't talk about anything drug related there!
Distilled vinegar has to be PH 2.5 by law in the UK due to stupid EU laws so it is extremely reliable, so in future check your facts.
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Old 01-14-2009, 08:03 AM
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Alternatives to Calibration SOlutions!
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Old 01-14-2009, 10:43 AM
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Ok dude, well I don't live in the UK.. I do supervise titration labs etc each and every semester and see first hand results that tell me I'm not wrong..
Regardless ppl buy pH solutions for a reason.. Most meters are more precise than 0.1..
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Old 01-15-2009, 10:41 AM
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thank you all for your time...if i've forgotten anyone please tell me
 
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