Safely dispose of muriatic acid after cleaning rocks

I needed to clean calcite off of petrified wood, so I bought a gallon of muriatic acid. Unfortunately, it yellowed in the sun and stained my rocks! So now I had useless acid lying around and there's only one way to dispose of it: the fun way. Note: I misspoke in the video, and said "baking powder" when I was clearly using baking SODA. Use baking soda. Thanks to the comments for pointing this out.
Use proper safety equipment and behaviors when working with acids.
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