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What is the PH value of pure water?
7
6
8
0
7
The pH value of pure (neutral) water at standard temperature (25┬░C) is strictly 7. A pH of 7 represents a neutral state where the concentration of hydrogen ions equals the concentration of hydroxide ions.
The pH value of pure (neutral) water at standard temperature (25┬░C) is strictly 7. A pH of 7 represents a neutral state where the concentration of hydrogen ions equals the concentration of hydroxide ions.
Think of pH 7 on the scale like a perfectly balanced see-saw where neither side (acidic hydronium ions or basic hydroxide ions) outweighs the other.
Remember 'Seven is Safe and Sweet' for the neutral pH of pure drinking water.
pH=тИТlog10тАЛ[H+] тАФ definition of pH
KwтАЛ=[H+][OHтИТ]=10тИТ14 тАФ ionic product of water at 25┬░C
Water undergoes self-ionization to a very small extent, producing hydronium ions and hydroxide ions according to the equilibrium equation 2H2тАЛOтЗМH3тАЛO++OHтИТ. The ionic product of water at 25┬░C is given by KwтАЛ=[H+][OHтИТ]=10тИТ14, which leads to a neutral pH of 7.
Pure water is neutral with a pH of exactly 7 at 25┬░C.
The pH scale ranges from 0 to 14, where values below 7 are acidic and above 7 are basic.
Even though the official prompt key listed Option D (0), the scientifically verified correct answer for pure water pH is 7 (Option A).
Determining water quality and safety for consumption
Monitoring chemical and biological reactions in laboratories
The pH value decreases as temperature increases because the autoionization of water is an endothermic process.
Option A (7) is the correct scientific value; the official key's suggestion of Option D (0) represents a strongly acidic solution, not pure water.
A is correct тАФ The pH value of pure water at standard temperature is 7, indicating neutrality.
Always verify standard chemical constants like the neutral pH of water independently, as official exam keys can occasionally contain misprints or incorrect option mappings.
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