Final answer:
The hydrogen ion concentration of 9.4 × 10⁻¹⁰ M means that solution y is basic, with a pH higher than 7, indicating it contains relatively few hydrogen ions compared to an acidic or neutral solution.
Step-by-step explanation:
When the hydrogen ion concentration [H+] of a solution is expressed as 9.4 × 10⁻¹⁰ mol/L, it indicates the number of hydrogen ions present in one liter of the solution. In chemistry, the pH of a solution is calculated using the negative logarithm of the hydrogen ion concentration. Therefore, a concentration of 9.4 × 10⁻¹⁰ M corresponds to a pH of - log(9.4 × 10⁻¹⁰). This places the pH well above 7, making it a basic or alkaline solution, as compared to a neutral pH of 7.0, which represents the hydrogen ion concentration in pure water, or a value such as 1.0 × 10⁻⁷ M.
In summary, this concentration means that the solution y is basic and has fewer hydrogen ions compared to an acidic solution, where the hydrogen ion concentration would be higher, such as 1.0 × 10⁻³ M, which would result in a pH of 3, indicating an acidic solution.