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H2SO4 is added to a large beaker of water. How is the solution different from the original water?
A) The solution turns blue litmus to red.
B) The solution turns phenolphthalein pink.
C) The solution has fewer hydrogen ions.
D) The solution has more hydroxide ions.

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Dejanras

Answer is: A) The solution turns blue litmus to red.

Sulfuric acid (H₂SO₄) is a strong acid, it means that the solution of sufuric acid is more acidic (pH<7) than water (pH = 7).

Chemical dissociation of sulfuric acid in water:  

H₂SO₄(aq) → 2H⁺(aq) + SO₄²⁻(aq).

When solution turns phenolphthalein pink, it means it is basic (pH>7).

Sulfuric acid has more hydrogen ions (H⁺) and less hydroxide ions (OH⁻) than water.

The solution in the beaker turns the blue litmus to red. Option A is correct.

What is a litmus test?

A litmus paper is an indicator of acid and base.  Blue litmus paper turns acid to red. Phenantheline is a solution that becomes colorless in an acidic solution.

H₂SO₄ is a strong acid thus dropping the pH of the solution by releasing Hydrogen ions.

H₂SO₄(aq) → 2H⁺(aq) + SO₄²⁻(aq).

Therefore, the solution in the beaker turns the blue litmus to red.

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