Re: Standardizing NaOH and HCL

"pp" <chateau.pp@xxxxxxxxx> wrote in message
news:1139007217.197910.39600@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

vinic@xxxxxxxx wrote:
I recently found data pertaining to the pH level of certain
concentrations of NaOH. Specifically, 0.01 N of NaOH is suppose to be
at a pH of 12. Seems like this would be a way to standardize the
solution. Does anyone in this group know why this isn't common
practice?

Mainly because that isn't a very precise method. In fact, it's barely in
the ballpark.

I'd guess that 0.05N and 0.015N NaOH solutions are pretty close to that
same pH, so the slope of the pH meter's response between them would be quite
shallow, despite the swing being a ±50% deviation from the norm.

Your pH meter would have to be a lot more sensitive, displaying accurately
and at a much higher resolution, _repeatably and constantly_, than it is
capable of doing to be useful in this fashion.

Tom S
www.chateauburbank.com.


.

Relevant Pages

  • Re: Standardizing NaOH and HCL
    ... resolution of two decimals on a meter. ... due to the degradation characteristics of NaOH in solution plus the ... question mark surrounding the distilled water. ... professionals, but our ISP dropped the usenet account. ...
    (rec.crafts.winemaking)
  • Re: My woes with testing TA
    ... I know that my digital pH meter was OK because I ... so I decided to take a look at the NaOH. ... and a bottle of 0.2N NaOH. ... It sounds like you have a supplier problem rather than a sodium hydroxide ...
    (rec.crafts.winemaking)
  • Titrating for TA: using a pH meter to find the end point
    ... Yesterday I decided to titrate with NaOH to measure TA, ... Calibrate the pH meter using a 7.01 buffer solution ... Start titrating with NaOH and measure the pH until it reaches ... I used commercial wine for this experiment, ...
    (rec.crafts.winemaking)
  • Re: what is buffer concentration?
    ... >I am asking because if it is both concentrations together it is no ... acid and sodium ethanoate in your case). ... the buffer conc will be 1 M regardless of the volumes of each. ... Another way is to use 1 M ethanoic acid plus "very concentrated" NaOH, ...
    (sci.chem)
  • My woes with testing TA
    ... I know that my digital pH meter was OK because I ... so I decided to take a look at the NaOH. ... and a bottle of 0.2N NaOH. ... have been water in the bottle. ...
    (rec.crafts.winemaking)