Looking for people into electrochemistry who may be able to answer this (preferably with sources). I've been thinking about this for quite a while and can't seem to get a satisfactory explanation.
My main issue is that I don't understand how the indicator electrode *actually* measures a change in potential when supposedly, nothing about the inside changes.
How does the electrode "feel" what's going on at the outside gel layer? How is it relayed?
When using a glass pH electrode, can it touch the bottom of the container it’s in? For example, if you’re measuring the pH solution of a solution in a beaker, can the electrode touch the bottom of the beaker?
Does the inner solution of a glass electrode change? I'm getting conflicting information on the internet.
Some places say that it is constant (at usually pH = 7) and the potential detected is between the pH 7 solution inside and the different pH solution outside.
Other places that explain the workings of the gel layer more in-depth, however, mention that once hydrogen has bonded to any -Si-O(-) spots on the gel layer, they "push" Na(+) ions towards the inside of the membrane, which would be a change in the inner solution, right?
Thanks in advance!
http://i.imgur.com/ZZLe8sO.jpg
We got a weird reading today and realized none of us had ever looked closely at the electrode before. Does the reference element just dangle like that? All the cartoons seem to suggest that, but it just looks weird, like it snapped off at a bottom attachment or something. All readings since seem to be normal. It would just be good to get confirmation about that free dangling element that can move around. Thanks all!
You stick the other electrode to your throat, and do electric shots.
Weird one here…. I am using the autopot xl watering system and earlier went to check my ph…. When I lift a measuring jug of water out of the reservoir it reads as 7.3ph but when I stick my pen in the reservoir directly it reads closer to 5.8ph. Any ideas why this may be? I ensured the water was mixed well and did a few readings. All the same results…. Please help
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- H
