Titration pH Tester?
Is there a titration style pH test kit available? All the ones I've seen
have you fill a vial with water to a line then put three drops of test fluid and have you match colors. A titration style pH tester would have you count the drops to a color change like the KH tester I have. tnx jtm -- Remove NOSPAM for email replies |
Titration pH Tester?
Is there a titration style pH test kit available? All the ones I've seen have you fill a vial with water to a line then put three drops of test fluid and have you match colors. No, one doesn't exist. Remember, pH is the log10 of H+ concentration, so there isn't a good linear correlation. At pH 6 there are 10 times the H+ of pH7, at pH 5 there are 100 times the H+ concentration at pH7, etc, etc. If you need pH to better than +/- 0.2 get a PinPoint, I've seen them around $85US. Cheers, Jeff Ludwig |
Titration pH Tester?
I may just get a PinPoint. I have trouble discerning the color changes even
when being careful about using a white background and flourescent or sunlight as a source. tnx jtm -- Remove NOSPAM for email replies "Jeff Ludwig" wrote in message news.com... Is there a titration style pH test kit available? All the ones I've seen have you fill a vial with water to a line then put three drops of test fluid and have you match colors. No, one doesn't exist. Remember, pH is the log10 of H+ concentration, so there isn't a good linear correlation. At pH 6 there are 10 times the H+ of pH7, at pH 5 there are 100 times the H+ concentration at pH7, etc, etc. If you need pH to better than +/- 0.2 get a PinPoint, I've seen them around $85US. Cheers, Jeff Ludwig |
Titration pH Tester?
I may just get a PinPoint. I have trouble discerning the color changes even when being careful about using a white background and flourescent or sunlight as a source. Just some things to keep in mind; maintence is *very* important for pH probes - they need to be calibrated at least every 6 weeks, kept very clean, don't allow them to scale and also write down when you last replaced the probe, they do have a rated lifetime (2 years for a decent one). Just because it reads to 2 decimals accuracy says nothing about the precision - I've overneutralized some solutions in the lab because I assumed the calibration was okay. Cheers, Jeff Ludwig |
Titration pH Tester?
good points
-- Remove NOSPAM for email replies "Jeff Ludwig" wrote in message news.com... I may just get a PinPoint. I have trouble discerning the color changes even when being careful about using a white background and flourescent or sunlight as a source. Just some things to keep in mind; maintence is *very* important for pH probes - they need to be calibrated at least every 6 weeks, kept very clean, don't allow them to scale and also write down when you last replaced the probe, they do have a rated lifetime (2 years for a decent one). Just because it reads to 2 decimals accuracy says nothing about the precision - I've overneutralized some solutions in the lab because I assumed the calibration was okay. Cheers, Jeff Ludwig |
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