Is CaF2 (calcium fluoride) acidic or basic? Is Ca(OH)2 a strong or weak base?

So I learned to look at where each ion came from. Ex: NaCl is a neutral salt because NaOH is a strong base and HCl is a strong acid. If you have NaF, this is slightly basic since NaOH is a strong base and F comes from HF which is a weak acid…

3 Answers

  • joeyeehung
    1 month ago

    You are right. CaF2 is slightly basic.

    The reason is HF is a weak acid ( but it is very corrosive).

    When dissolved in water, the F- ion formed will undergoes hydrolysis reaction with water molecules forming HF and OH-. Thats why, it is basic.

    F- + H2O —————> HF + OH-

    Ca(OH)2 is a strong base.

  • richard
    5 days ago

    Let’s first understand the concept of strong and weak here. Either strong acid or base will completely dissociate in water but weak acid and base will not completely dissociate. So, when you want to neutralize strong acid with weak base, you will have to add more amount of weak base to neutralize strong acid. If you added same amount of strong acid and weak base, end result would be still acidic but it will be less acidic than the original acidity. H.

  • sailor astra
    1 month ago

    Just to correct your qualifying statement above, HF is not a weak acid.

    HF is stronger than HCl and will eat through glass and just about any other substance. It must be shipped in Polyethylene bottles. It will not react with Platinum, Gold, Graphite, or wax.

    CaF2 is a neutral compound. It occurs naturally as the mineral Fluorite.

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