A chemically neutral solution is defined as one having a pH level__________________?
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Answer: C. equal to 7
Explanation
A chemically neutral aqueous solution exhibits a balanced concentration of hydrogen and hydroxide ions. The logarithmic pH scale defines neutrality by setting the reference midpoint precisely at seven. At this specific value, the solution is neither acidic nor alkaline at standard room temperature. The term pH stands for potential of hydrogen, measuring hydrogen ion activity in aqueous solutions. Pure water autoionizes to produce equal concentrations of hydronium and hydroxide ions at equilibrium. Standard temperature conditions establish the neutral pH threshold exactly at seven for pure water.
Maintaining neutral pH levels is crucial in biological systems, water treatment plants, and chemical processes. Deviations from neutrality in industrial cooling water systems can cause severe corrosion or scaling. Laboratory titrations and chemical synthesis rely on accurate pH measurements to confirm reaction endpoints. A pH value greater than seven indicates an alkaline or basic solution containing excess hydroxide ions. A pH value less than seven denotes an acidic solution characterized by excess hydrogen ions. Claiming pH has nothing to do with neutrality ignores fundamental chemical acid-base definitions.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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