The pH value of a sample of multiple distilled pure water, with minimal dissolved impurities, is expected to be which of the following?

Introduction / Context:
This question tests your understanding of pH and the nature of pure water. Pure water is a standard reference point on the pH scale and is used to define neutrality. Multiple distilled water has gone through several stages of purification to remove dissolved salts and other impurities, so its pH gives you an ideal view of neutral water conditions.

Given Data / Assumptions:

• The sample is multiple distilled water, which is very pure.
• We want to know the expected pH value description.
• Options describe pH as zero, fourteen, very near to zero, very near to seven or very near to fourteen.
• Assume standard temperature conditions close to room temperature.

Concept / Approach:
Pure water undergoes slight self ionisation into H plus and OH minus ions. At 25 degrees Celsius, the concentrations of H plus and OH minus are each 10 raised to the power minus 7 moles per litre, giving a pH of 7, which is defined as neutral. Real samples may deviate slightly due to dissolved carbon dioxide and other impurities, but multiple distilled water is designed to be very close to this ideal. Therefore, its pH is expected to be very near to seven, not near zero or fourteen, which represent strong acidity or basicity.

Step-by-Step Solution:

Verification / Alternative check:
Laboratory measurements of freshly prepared distilled water typically show pH values slightly below or above 7, depending on exposure to air and carbon dioxide. For example, absorbing a little carbon dioxide can reduce pH slightly below 7, but it still remains close to neutrality. Calibration of pH meters often uses a buffer solution with pH 7, which models neutral water. The general teaching is that pure water is neutral and has pH 7, so the answer choice indicating very near to seven is the best description.

Why Other Options Are Wrong:

• Zero: A pH of zero would correspond to a very strong acid, not distilled water.
• Fourteen: A pH of fourteen is characteristic of very strong bases such as concentrated sodium hydroxide, not pure water.
• Very near to zero: Still implies high acidity, which does not match neutral water.
• Very near to fourteen: Implies high basicity, again not correct for distilled water.

Common Pitfalls:
Some learners may have heard that real water can be slightly acidic due to dissolved carbon dioxide and incorrectly conclude that very pure water must have a much lower pH. However, even with small amounts of carbon dioxide, the pH remains close to 7 and does not approach extreme acidic values. Another confusion is mixing up pure water with everyday tap water, which contains various dissolved salts and may not be exactly neutral. For examination purposes, you should associate pure or multiple distilled water with a pH very close to seven.

Final Answer:
The pH value of multiple distilled water is expected to be Very near to seven.