Sulfuric Acid Standard - Does the strength change as it ages?

[Dennis Cartier]

I have some 0.1N Sulfuric Acid that I use for making alkalinity testing reagent for my Alkatronic. I noticed that it expires in July 2021. How will the strength of the solution change after it expires? I have a lot of the 4L jug left and am just wondering if I will be able to use it all before the expiry.

Dennis

 

[Lasse]

@Focustronic_Jonas @Focustronic_Eric can you answer the above question?

Sincerely Lasse

 

[Randy Holmes-Farley Verified Community Expert]

Assuming you have the lid on, it is fine.

if you allow evaporation, it will get stronger to the extent it has evaporated (so 50% evaporation is a doubling in strength).

 

[Lasse]

If you need Jonas answer - I can reach him by texting him - he is Swedish and live close to Gothenburg and I know him. But IMO - Randy's answer is good enough.

Sincerely Lasse

 

[Dennis Cartier]

If you need Jonas answer - I can reach him by texting him - he is Swedish and live close to Gothenburg and I know him. But IMO - Randy's answer is good enough.

Sincerely Lasse

No I am good Lasse, thanks. The reagent solution turned out to be fine. The discrepancy was traced to user error. I was using the Salifert alk test incorrectly and when I corrected my testing procedure, everything lined up. Thanks for the help though.

Dennis