If 25.0 mL of 0.451 M NaOH solution is titrated with 0.253 M H2SO4, the flask at the endpoint will contain (besides the indicato
r phenolphthalein) as the principal components:
1 answer:
Answer:
H₂O, Na⁺, and SO₄²⁻
Explanation:
NaOH and H₂SO₄ are strong electrolytes. They will ionize completely
.
Molecular equation: 2NaOH + H₂SO₄ ⟶ Na₂SO₄ + 2H₂O
Ionic equation: 2Na⁺ + 2OH⁻ + 2H⁺ + SO₄²⁻ ⟶ 2Na⁺ + SO₄²⁻+ 2H₂O
- The concentration of water is 55.5 mol·L⁻¹.
- The concentration of Na⁺ is twice that of SO₄²⁻ .
- Hydrolysis of SO₄²⁻ is negligible.
The principal components in the flask at the endpoint are H₂O, Na⁺, and SO₄²⁻.
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