Question

valency of sulphate (so4)by spdf method
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Answer 1

to determine the valency of the sulfate radical, consider hydrogen sulfate: H2SO4.

Count how many hydrogen atoms are in the formula. This is the valency of the radical. For example, H2SO4 has two hydrogen atoms, so the valency of sulfate is two. Because sulfate can bond with two positive hydrogen atom, its valency is the opposite charge and often expressed as 2-.

If no hydrogen-containing compound is available, use a compound with a known valence. For example, aluminum sulfate has the formula Al2(SO4)3. Aluminum has a valence of 3+. Because there are two aluminum atoms in the formula, the total valence is 6+. Because there are three sulfate ions in the formula, 6 divided by 3 yields a valence number of 2 for sulfate. Aluminum makes ions with a positive charge, which is why the sulfate ion has a negative charge, and that makes the sulfate radical have a 2-valency.

Answer 2

What’s the valency of so4?

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5 ANSWERS



Yash N. Singh

Answered Feb 26, 2018

SO4 has a valency of 2 . To find its valency ,I can advice you 2 ways which I often use are:

a•SO4 is an anion which has came from an acid H2SO4, in which hydrogen as always has valency 1. Since hydrogen is more electro+ve than SO4,its oxidation no. will be +1. So by using this information we can find oxidation no. of SO4.

Let x be oxidation no. of SO4. Since, the sum of oxidation nos. will be zero, so equating it with zero:

2×H+1×SO4=0

2×1+1×x=0

x=-2Which is the oxidation no. of SO4.

This implies that it has valency 2.

Note: Remember Valency is combining capacity ,it does not have +or - charge, while oxidation no. show whether it can gain(+ve charge) or lose (-ve charge) electrons.

hope it help you.........