In water, phosphoric acid dissociates according to the chemical reactions written below. Which of the following statements about the dissociation of phosphoric acid is true?
H3PO4⇌H2PO−4+H+
H2PO−4⇌HPO2−4+H+
HPO2−4⇌PO3−4+H+
1. H2PO4 - is a strong acid and H3PO4 and HPO4 2- are weak acids.
2. HPO4 2- is a strong acid and H3PO4 and H2PO4 - are weak acids.
3. H3PO4, H2PO4 - and HPO4 2- are all weak acids.
4. H3PO4, H2PO4 - and HPO4 2- are all strong acids.
5. H3PO4 is a strong acid and H2PO4 - and HPO4 2- are weak acids.
In water, phosphoric acid dissociates according to the chemical reactions written below. Which of the following statements about?
2016-05-31 1:16 am
回答 (1)
2016-05-31 1:25 am
The sign of reversible reaction (⇌) is used in the three given equations. This means that the acid on the reactant side in each equation is a weak acid.
...... The answer is: 3. H₃PO₄, H₂PO₄⁻ and HPO₄²⁻ are all weak acids.
...... The answer is: 3. H₃PO₄, H₂PO₄⁻ and HPO₄²⁻ are all weak acids.
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