Using bottled water to calibrate ph

Nastydroaste

Well-Known Member
I ordered my calibration liquid about 2 weeks ago, and it has yet to come in. I have a small pack calibration solution, but I think its already been compromised with my resevoir liquid and not accuate. I was wondering, I know a lot of bottled water manufacturers put the ph of their water on the labels. Now could this be used to calibrate? I just wonder if they are accurate. Im using a cheapy ph meter, and im afraid it might be going out of wack.
 
Distilled water is 7.0 and you can use it for calibration but not so good as storage solution.
 
Some distilled water is questionable and may not be 7.0 but by defintion distilled water should be 7.0. I would buy 2 or 3, and see if you get the same reading on all, no matter what the reading is. If so they are probably 7.0 and you can calibrate to that.
 
I tested distilled water today just to see, and yep....7.0. Good advice as usual, illegal smile!

Just remember, that 7.0 is only cal'ing the high side of your probe. You'll still want to get 4.0 buffer solution and cal the low side asap...It does make a difference, as you'll find out. when you adjust one side, it will effect the other. It takes a little while to dial it in, but is very important to do. Just takes a little patience.
 
Using both calibration points will increase precision by less than .1 in the 5.5 to 7 range over just doing 7.0. That is significant for many applications which is why they make sensitive meters with dual calibration. But I see no significance in .1 for what we are doing and I only calibrate to 7.0. I buy 7.0 solution by the quart and it makes perfect storage solution as well.
 
Thanks alot, good idea on buying two of em, still yet to come in.... I'm pissed. Pretty sure mine only calibrates with one adjustment point though, its a cheapy, but works
 
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