Relation Between Temperature and Ph
Hi Ted, today i purchased a cheap $40 Hansa pH pocket meter the man in the shop calibrated it for me and also gave me buffer solution. when i got home i began to play with it .. i put it on a glass of distilled water and what i saw strange was it started at 6.8 and then began to slowly drop 6.7 ... 6.6 ... after two minutes it was 5.8 .. 5.7 etc. i thought something was wrong so i put it in buffer solution and it was stable 7.0 .. but after a minute it drop to 6.9 and then went back to 7.0 a few seconds later. i then ... thought ok i will try another glass of distilled water ... again it did the same thing ... it started at 6.8 and then began to slowly drop 6.7 ... 6.6 ... after two minutes it was 5.8 .. 5.7 etc why does pure water pH behave this way ? or is somethign faulty with the pH meter ? the only thought i had was temperature ?? as the probe got colder/warmer it changed pH ?? Thanks.