Author Topic: Differences in pH Meters.  (Read 688 times)

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Cricket

  • Guest
Differences in pH Meters.
« on: January 17, 2003, 05:19:00 PM »
SwiC is looking at some pH meters and can't seem to find much info on a particular brand/model.

If the name is unexceptable, SwiC understands the mark out. The brand is Chekmite, and he can't find any specs on these:

Chekmite pH Testers
(WLS-30018-01), 1 pH Meter
(WLS-30018-03), 3 pH Meter

or maybe someone realizes the differences and can share their insight. Swic as never bought one before and knows little about them. Any help is greatly appreciated.

Thanks a bunch,
C.


lugh

  • Guest
pH meters are unreliable for our purposes
« Reply #1 on: January 17, 2003, 06:05:00 PM »
Don't waste your money on pH meters, they're unreliable and inaccurate  :(  Here's some applicable threads for you to read  ;D

Post 313062 (missing)

(krystalle: "rookie question..........", Chemicals & Equipment)

Post 291348 (missing)

(pseudaus: "ph paper maddness??!!", Newbee Forum)

Post 277059 (missing)

(Rocksolid: "PH indicator", Newbee Forum)

Post 182127 (missing)

(Synthia: "ph meter", Stimulants)

Post 83672 (missing)

(noj: "digital ph-meter (cheap)", Chemicals & Equipment)

Post 80251 (missing)

(ANONYM: "pH meter problems", Chemistry Discourse)

Post 55160 (missing)

(SuperAssman: "Diluting NaOh &Ph Go Up?", Stimulants)

Post 44595 (missing)

(Jacked: "Re: pH-Tester", General Discourse)

Post 15808 (missing)

(speedygonzaless: "ph paper in oz", Newbee Forum)

Post 7331 (missing)

(XplosiveKemistry: "Ph tester", Newbee Forum)

Post 97314 (missing)

(DroYd: "Damn PH gauge,..........^^^I Hate Them^^^.........", Chemicals & Equipment)

Post 84245 (missing)

(ero323: "iso or no?  pH paper ok?", General Discourse)

Post 123038 (missing)

(DeJay: "PH paper", Newbee Forum)

Post 109642 (not existing)

Post 104537 (missing)

(dr.fart: "REALLY Stupid Question", Chemistry Discourse)

Post 100563 (missing)

(Commodium: "pH Meters, How Often to Calibrate?", Chemistry Discourse)


JoeCool25

  • Guest
Question about HCl titration at the end.....
« Reply #2 on: January 17, 2003, 07:02:00 PM »
Don't waste your money on pH meters, they're unreliable and inaccurate.....

Lugh, Question about HCl titration at the end, is it there not better to have a ph meter, with the always changeing ph? (perhaps to go from 13 to 5,5 ?)
Swim know that often to get to 7 it takes very much more hcl and after 7 to 6 and 5 it goes very fast.
With ph-paper swim must be very carefull not to overshoot.
Swims ph-meter (old) is broken. Swim thinks to buy a new one.
Now swim read that it´s make no sense to use one.

Is this correct for hcl titrations too ?

Thanks for every Info. /Joe.

lugh

  • Guest
titration
« Reply #3 on: January 17, 2003, 07:21:00 PM »
Titration is best done using only half of the free base, that way when you overshoot you can recover  :)  Cheap pH meters don't work with non aqueous solvents, and often quit working at the most inconvenient time  :(