Praxis Dashboard

To neutralize a pH 3 solution, use pH 9 solution.

A pH 3 solution is acidic, and to neutralize it, a basic solution is required. A pH 9 solution is alkaline, making it suitable for neutralizing the acidity of a pH 3 solution.

A) Salt solution

A salt solution does not inherently possess acidic or basic properties unless it is specifically formulated to do so. Therefore, it would not effectively neutralize a pH 3 solution, as it lacks the necessary alkaline properties to counteract the acidity.

B) Acidic solution

Using another acidic solution would only increase the acidity of the pH 3 solution, making it even more acidic rather than neutralizing it. Hence, this option is counterproductive for the neutralization process.

C) pH 7 solution

While a pH 7 solution is neutral, it may not be sufficient to effectively neutralize a pH 3 solution. It would help to raise the pH, but it does not provide the necessary alkalinity to achieve a complete neutralization.

D) pH 9 solution

A pH 9 solution is basic and is ideal for neutralizing a pH 3 solution. The basic properties of the pH 9 solution will react with the acidic components, effectively raising the pH toward neutral levels.

Conclusion

The pH 9 solution is the best choice for neutralizing a pH 3 solution due to its alkaline nature, which counteracts acidity. Other options either lack the necessary properties or would exacerbate the acidity, making them unsuitable for the task. Thus, the choice of pH 9 is both scientifically sound and effective for achieving neutralization.