Wash solution for Milwaukee pH electrode

[Koty]

Is it always 0.1 M HCl?

 

[EnterName]

They appear to have multiple cleaning solutions but as far as I was able to find it's 0.034% HCl.

https://milwaukeeinstruments.com/content/SDS/US_MA9016_GHS_USA_3.pdf
https://www.milwaukeeinst.com/web/files/msds/eng/m10016b.pdf
For the 230mL (≈ 230g) bottles they sell, 0.034% would be 0.0782g HCl, which is roughly 0.0021mol or 0.009mol/L. So it should very roughly be about 0.01mol/L or 0.01M.

 

[Randy Holmes-Farley Verified Community Expert]

What are you trying to get off it?

KCl is not a cleaning solution. It is a filling solution.

If you just want to rinse, diluted seawater is fine.

 

[EnterName]

What are you trying to get off it?

KCl is not a cleaning solution. It is a filling solution.

If you just want to rinse, diluted seawater is fine.

HCl not KCl according to the linked SDS above. These products are actually sold as cleaning solution (maybe to get rid of CaCO3 residue or so?)

 

[Randy Holmes-Farley Verified Community Expert]

Sorry, not sure why I read Koty's post as KCl on my phone, but certainly, yes, HCl is a standard cleaning solution that I also use if needed to remove suspected CaCO3 deposits. I don't think the concentration is at all critical, though I would not use concentrated HCl.

 

[Koty]

Got the Milwaukee Pen pH51 to test my tank.
Fauna Marin ICP claimed my pH was very low. Just tested at about 16:00 and it was 8.0.
The pH of a sample used for ICP will probably be low due to bacterial activity on the organic matter in it over 1-2 weeks.

 

[Randy Holmes-Farley Verified Community Expert]

Yes, I would not take as useful the pH of a sample that had been closed for an extended period.

 

[EnterName]

Sorry, not sure why I read Koty's post as KCl on my phone, but certainly, yes, HCl is a standard cleaning solution that I also use if needed to remove suspected CaCO3 deposits. I don't think the concentration is at all critical, though I would not use concentrated HCl.

All good. Happens to the best of us :)

Yes, I would not take as useful the pH of a sample that had been closed for an extended period.

I don't even know why they offer a pH reading. What's next? Temperature? :D