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 indicator phenolphthalein) as the principal components:

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 principal components in the flask at the endpoint are H₂O, Na⁺, and SO₄²⁻.

i dont know the answe

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)