Compared to a solution with a pH value of 7 a solution with a thousand times greater hydronium ion concentration has a pH value of what

Answer is: solution has a pH value of 4.

pH ₁ = 7.

pH = - log[H ₃O⁺ ].

[H₃O⁺]₁ = 10∧ (-pH).

[H₃O⁺]₁ = 10⁻⁷ M.

[H₃O⁺]₂ = 10⁻⁷ M ·10³.

[H₃O⁺]₂ = 10⁻⁴ M.

pH₂ = - log[H₃O⁺]₂.

pH₂ = - log (10⁻⁴ M).

pH₂ = 4.

pH (potential of hydrogen) is a numeric scale used to specify the acidity or basicity an aqueous solution.

When pH is less than seven (pH <7), solution is acidic ...

When is equal seven (pH = 7), solution is neutral.

When pH is greater than seven (pH > 7), solution is basic.