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Equivalent mass of h2so4

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What is the equivalent weight of H2SO4?

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Answered May 29, 2009 7:41PM

The equivalent weight or gram equivalent weight (GEW) for a strong mineral acid is the molecular weight (MW) divided by the number of replaceable hydrogen ions. For a strong base like sodium hydroxide (NaOH) it is the MW divided by the number of replaceable hydroxide ions. The GEW is applicable to other types of chemical reactions and it is necessary to know what the reaction is in order to determine the GEW. This is a common theme in chemistry, you must know what the chemical reaction is in order to determine concentrations. For H2SO4: H2SO4 = 98.08 g/mole (MW)

H2SO4 has two replaceable protons (H+) & therefore has 2 equivalents (eq)

GEW = g/equivalents (eq) = MW/eq = g/mole X moles/eq H2SO4 GEW = 98.08/2 = 49.04 g/eq For HCl: HCl = 36.46 g/mole HCl has 1 replaceable proton & therefore has 1 equivalent HCl GEW= 36.46/1 = 36.46 g/eq You should be able to calculate this for NaOH, KOH and HNO3

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Answer 2

Your answer:

Molar mass of H₂SO₄ = 98 g

No. of H atoms (also called basicity) of H₂SO₄ = 2

Equivalent weight of an acid = $\frac{Molar\:\:mass\:\:of\:\:the \:\:acid}{Bassicity\:\:(or)\:\:no.\:\:of\:\:H^+\:\:ions\:\:present}$

So, your answer is:

98/2 = 49 grams is the equivalent weight

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