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Equilibrium

Question
CBSEENCH11008206
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The conjugate base of H2PO4- is

  • PO43-

  • HPO42-

  • H3PO4

  • P2O5

Solution

B.

HPO42-

H3PO4 is a tribasic acid, thus ionising in three steps.
left parenthesis straight i right parenthesis space straight H subscript 3 PO subscript 4 space rightwards harpoon over leftwards harpoon with space space on top space straight H to the power of plus space plus space straight H subscript 2 PO subscript 4 superscript minus left parenthesis ii right parenthesis space straight H subscript 2 PO subscript 4 superscript minus space rightwards harpoon over leftwards harpoon with space on top space straight H to the power of plus space plus space HPO subscript 4 superscript 2 minus end superscript left parenthesis iii right parenthesis space HPO subscript 4 superscript 2 minus end superscript space rightwards harpoon over leftwards harpoon with space space on top space straight H to the power of plus space plus space PO subscript 4 superscript 3 minus end superscript

The conjugate base is formed when an acid loses its proton. Thus, HPO42- is the conjugate base of H2PO4- (which is an acid in step II, but is the conjugate base of H3PO4 in step I)

Some More Questions From Equilibrium Chapter

Which measurable property becomes constant in water vapour equilibrium?

Give an example from daily life in which there is gas solution equilibrium?

A crystal of common salt of a given mass is kept in its aqueous solution. After 24 hours, its mass remains the same. Is the crystal in equilibrium with the solution?

What is the role of forward and backward reactions at equilibrium of a reversible reaction?

What is a forward reaction?

What condition favours a reversible reaction?

What is a backward reaction?

What type of equilibrium is attained in a reversibe chemical change?

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