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AQA GCSE · Question 02.1 · Chemical changes
This question is about acids and alkalis. Acids and alkalis are substances that produce ions in aqueous solution. Which ion is always produced by an acid in aqueous solution?
This question is about acids and alkalis. Acids and alkalis are substances that produce ions in aqueous solution. Which ion is always produced by an acid in aqueous solution?
Answer options:
A.
Cl⁻
B.
H⁺
C.
Na⁺
D.
OH⁻
E.
SO₄²⁻
How to approach this question
Recall the definition of an acid. An acid is a proton (H⁺ ion) donor. When dissolved in water, all acids release H⁺ ions.
Full Answer
B.H⁺✓ Correct
By definition, an acid is a substance that releases hydrogen ions (H⁺) when dissolved in water. For example, hydrochloric acid (HCl) dissociates into H⁺ and Cl⁻ ions. Sulfuric acid (H₂SO₄) dissociates into 2H⁺ and SO₄²⁻ ions. The common ion to all acids is H⁺.
Common mistakes
✗ Confusing the ions produced by acids and alkalis.\n✗ Choosing an ion that is only present in a specific acid (like Cl⁻ or SO₄²⁻).
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