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how do you soften baking soda which has hardened

I purchased a huge bag of baking soda for cleaning. It has become a rock. How do I soften it so I can use up the bag?

  • Dan's of Central Florida, Inc.
    Dan's of Central Florida, Inc. Clermont, FL
    on Feb 1, 2012

    Hmm, I've never run into this myself, but it comes to mind that smacking it a bunch with a hammer might work. If that doesn't, I'd just go and get more (perhaps in a smaller quantity).

  • 3popps
    on Feb 2, 2012

    If you are using it for cleaning, you generally will make it into a paste, so it doesn't really have to be a powder again. I would try to chip away at your baking soda rock. In the future, avoid getting any moisture into your baking soda. That is probably what caused your problem.

  • Sharon G
    Sharon G
    on Feb 3, 2012

    I want to use it with vinegar to clean the drains and a paste isn't possible. Think I will just throw it out and get a smaller bag. Thanks

    • Linda
      Linda Glendale, AZ
      on May 6, 2016

      Just add the vinegar to a few lumps you smashed

  • Marilynn Gillespie
    Marilynn Gillespie Canada
    on May 3, 2015


  • PainterNoni
    PainterNoni Kent, WA
    on Jun 22, 2015

    I had the same problem...I need it for my goats, for cleaning, etc. It got hard as a rock even before I opened it. I just tried this, and it works. Take a pastry blender...the kind with a handle and metal splines....just scrap the top of the "rock", and it turns into powder again.

  • Barbara
    Barbara Lomita, CA
    on Apr 2, 2016

    Put a quarter of an apple inside the box and let it sit there for a day or two, the moisture from the apple should help it soften up a little bit, much like brown sugar.

  • William
    William Burbank, IL
    on Apr 2, 2016

    Still good. Use a hammer.

    • Kaya Hewitt
      Kaya Hewitt Dearborn, MI
      on Jun 9, 2017

      Baking powder is different from baking soda (sodium carbinate)

  • Marie
    Marie Saint George, UT
    on Aug 25, 2017

    Hardened Baking Soda can be turned back into a powder by:

    1. Place the hardened baking soda into a larger plastic container.
    2. Cover the soda bag with a dish towel.
    3. Use a hammer and break into chunks.
    4. Pour the chunky baking soda into the plastic container (throw away the beat up bag).
    5. Place soda chunks into a blender - blend until powdered (wait a minute until the powder has settled).
    6. Place a large strainer over a large bowl and slowly pour the powdered baking soda into the strainer - Strain (put the small chunks back with the larger chunks - for the next round. Continue blending the rest of the chunky baking soda.
    7. Spoon the strained powdered baking soda into clean "dry" containers. Store...

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