• Question: how long does acid stay active for?

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      Asked by Atom Squad to Stuart, Richard, Lauren, katy, Anais on 15 Mar 2016.
      • Photo: Stuart Atkinson

        Stuart Atkinson answered on 15 Mar 2016:

        Hi. Acid can stay active in a bottle for a long time. Most acids are formed from dissolving a gas in water, so over time the gas slowly escapes from the water and the acid gets weaker.

      • Photo: Lauren Laing

        Lauren Laing answered on 15 Mar 2016:

        Yes Stuart is right, all acids will have a ‘use by’ date.

      • Photo: Richard Friend

        Richard Friend answered on 15 Mar 2016:

        If you keep it sealed in the bottle, it can last for years and still be fine. If you leave the lid off, as Stuart says, the acid will get weaker over time. Some acids will actually suck the moisture out of the air and dilute themselves if you leave the lid off.

      • Photo: Katy Kellett

        Katy Kellett answered on 16 Mar 2016:

        They are all right, not much more to add. As soon as something is open to the environment it can become contaminated and then its kind of not useful anymore!

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