The best way to neutralize a solution that has an approximate pH of 5 is by adding which of the following?

Rationale

A basic solution

To neutralize a solution with a pH of 5, which is mildly acidic, the best approach is to add a basic solution. This addition will increase the pH towards neutrality (pH 7) by reacting with the excess hydrogen ions present in the acidic solution.

A (Pure water) YOUR ANSWER

While adding pure water may dilute the solution, it won't effectively neutralize the acidity. The pH would remain relatively unchanged unless a significant amount of water is added, which might not be practical or efficient for achieving neutralization.

B (An acidic solution) YOUR ANSWER

Adding another acidic solution would further decrease the pH of the existing solution, making it more acidic. This is counterproductive when the goal is to neutralize the acidity, thus this option would not contribute to achieving a neutral pH.

C (A basic solution) CORRECT

Adding a basic solution is the ideal method for neutralizing an acidic solution, as it provides hydroxide ions that will react with the hydrogen ions in the solution. This reaction raises the pH, steering the solution towards neutrality, making it the most effective choice.

D (A sodium chloride solution) YOUR ANSWER

Sodium chloride (table salt) is a neutral salt and does not affect the pH significantly. While it may contribute to the ionic strength of the solution, it does not neutralize acidity, making it ineffective for raising the pH from 5 toward neutrality.

Conclusion

To effectively neutralize a solution with a pH of 5, the addition of a basic solution is essential. This method directly counteracts the acidity by providing hydroxide ions that react with hydrogen ions, thereby elevating the pH toward neutral. Other options either do not change the pH or exacerbate the acidity, reinforcing the necessity of using a basic solution for effective neutralization.

The best way to neutralize a solution that has an approximate pH of 5 is by adding which of the following?

A basic solution

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