Using HCL to test rocks Question

Discussion in 'Freshwater Substrates - Gravel, Sand' started by Dean, Apr 5, 2010.

  1. DeanValued MemberMember

    I'm going to use HCL (Hydrochloric acid) to test if my gravel is safe. Should I test the gravel with full strength HCL or should I dilute it? Thanks.

    p.s. I have a science teacher helping me with this so I don't hurt myself...
  2. ButterflyModeratorModerator Member

    Most gravel purchased at the store is inert any way but any rocks you gather from streams or rivers should be tested.
    It's much safer to test with vinegar. If it bubbles it's only safe to use in tanks needing a high pH.
    What ever you test with make sure you rinse what you test very thoroughly.
  3. ShawnieFishlore LegendMember

    no need to test gravel from a pet store as carol suggested....the residue would scare me for sure
  4. DeanValued MemberMember

    it's mined from the Rocky Mountains by a friend who pans for gold. I've read that vinegar isn't strong enough of an acid to test rocks but I did the vinegar test and it didn't bubble. I just wanted to make sure it's ok.
  5. ElodeaWell Known MemberMember

    I just use one of the API Master Test Kit liquids...was it ammonia #2? I forgot. It contains HCL.
  6. DeanValued MemberMember

    In read an article that said to use 1M HCL solution to test is a rock is safe. Can anybody confirm that?
  7. DeanValued MemberMember

    I used a slightly diluted 12M HCL solution and no bubbles. I will be getting a 1M HCL solution for future testing so I don't need to test rocks in a science lab. Thanks everyone.

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