Could you measure the pH of ocean water by using a strong acid-weak base titration? I was thinking that you could set up a standard titration with ocean water as the "unknown", and drip the known HCl solution into it until the equivalence point but I don't know you would go about figuring out the equivalence point and consequently the pH of ocean water using this method. Is it even possible?

  • $\begingroup$ Titration doesn't measure pH in the first place, much like a tape-line doesn't measure weight. $\endgroup$ – Ivan Neretin Nov 8 '19 at 8:31
  • $\begingroup$ I realize that titration isn't a direct method by which to measure pH but can't you use it to determine OH-/H+ concentrations and calculate pH using that? $\endgroup$ – Jonah Nov 8 '19 at 8:34
  • $\begingroup$ No. Well, unless you know for sure there is one single fully dissociated acid (or base) in your solution. In that case it will work like you said. Otherwise it won't. $\endgroup$ – Ivan Neretin Nov 8 '19 at 8:53
  • $\begingroup$ This might help: differencebetween.com/… $\endgroup$ – Buck Thorn Nov 8 '19 at 10:14
  • $\begingroup$ Titration does not determine content of H+ nor OH-, as sea water is a kind of a diluted pH CO2/HCO3- buffer. $\endgroup$ – Poutnik Nov 8 '19 at 12:15

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