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Topic: How to find the equivalent weight?  (Read 2859 times)

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Offline IBM

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How to find the equivalent weight?
« on: September 02, 2018, 08:45:14 PM »
As we know, Equivalent weight = molecular weight/number of H+ replaced
So, in H2SO4, E = M/2 = 98/2 = 49g/equivalent of H+
1.  But in this reaction, NaOH + H2SO4 = NaHSO4 + H2O how to calculate the equivalent weight of H2SO4?
2. 2NaOH + H3PO4 = Na2HPO4 + H2O, How to calculate the equivalent weight of 'H3PO4'?
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Offline mjc123

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Re: How to find the equivalent weight?
« Reply #1 on: September 03, 2018, 04:43:27 AM »
Try applying the equation in the first line of your post.
Note that for polybasic acids, there is no such thing as the equivalent weight. It depends on the reaction, and how many Hs are replaced.
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Offline Vidya

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Re: How to find the equivalent weight?
« Reply #2 on: September 06, 2018, 07:45:33 AM »
Quote from: IBM on September 02, 2018, 08:45:14 PM
As we know, Equivalent weight = molecular weight/number of H+ replaced
So, in H2SO4, E = M/2 = 98/2 = 49g/equivalent of H+
1.  But in this reaction, NaOH + H2SO4 = NaHSO4 + H2O how to calculate the equivalent weight of H2SO4?
2. 2NaOH + H3PO4 = Na2HPO4 + H2O, How to calculate the equivalent weight of 'H3PO4'?
It  is also defined as molar mass /electrons transferred
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