How will you find out the Equalent weight of any Acid&Base?

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  • Anonymous
    1 decade ago
    Favourite answer

    The equivalent weight of an acid is the weight that contains 1 g mol of H+ ions or OH- ions in the case of a base eg.

    HCl EW = 36.5 = MW

    H2SO4 EW = 49 = MW / 2

    NaOH EW = 40 = MW

    Mg(OH)2 EW = 29 = MW / 2

    A solution containing 1 EW of solute per litre of solution is a 1 N solution.

    EW weight will varying with reaction eg

    CaCO3 + 2HCl ===> CaCl2 + CO2 + H2O

    EW CaCO3 = 50

    2CaCO3 + 2HCl ===> CaCl2 + Ca(HCO3)2

    EW CaCO3 = 100

  • Anonymous
    1 decade ago

    hi am chandu

    generally

    acids if we have fined its equivalent weight by dividing its weight with basicity means

    if u take h2so4 its weight 98 basicity 2 e.wt.49 k

    take base weight by its acidity

    take naoh weight 40 acididty 1 eq.wt 40 etc k

  • 1 decade ago

    the key here is moles....

    If you have a mass (or number of moles) of either the acid or the base, you can figure out how much of the opposite species (acid or base) you need to neutralize everything (the equivalent weight required)

    It is all basic stoichiometry, just remember to convert the moles required properly.

    For example, if you had:

    HCl + NaOH --> NaCl (table salt) + H20

    For every mole of acid (HCl) you react, you need to react 1 mole of base (NaOH), so if you know you, say, had 1 mole of acid, you know you need 1 mole of base, and you can multiply 1 mole by the molecular weight of the base

    be careful for things like:

    H2SO4

    H3PO4

    etc

    because they release many H+

    Ex:

    H2SO4 + 2NaOH --> Na2SO4 + 2H2O

    So in this case, you need to add 2 moles of base for every mole of acid

    other then that, i assume you know how to convert moles to mass using molecular weight etc.

    BF

    4th yr Chem Major

    U of O

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