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

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• Anonymous

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

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

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.

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