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The pH of a neutral solution at 25 degrees Celsius is:
0
7
14
1
7
The pH of a neutral aqueous solution at standard temperature (25┬░C) is exactly 7. At this value, the activity of hydronium ions equals that of hydroxide ions, resulting in a perfectly neutral chemical environment.
The pH of a neutral aqueous solution at standard temperature (25┬░C) is exactly 7. At this value, the activity of hydronium ions equals that of hydroxide ions, resulting in a perfectly neutral chemical environment.
Think of pure water as a balanced scale where the positive hydrogen ions and negative hydroxide ions weigh equally, resulting in neutrality just like a scale at zero balance.
Neutral is Seven: Seven is Heaven for balance!
pH=тИТlog10тАЛ[H+] тАФ Definition of pH
KwтАЛ=[H+][OHтИТ]=1.0imes10тИТ14 тАФ Ionic product of water at 25┬░C
Water undergoes self-ionization to a very small extent, producing hydronium and hydroxide ions according to the equilibrium expression 2H2тАЛOтЗМH3тАЛO++OHтИТ. At 25┬░C, the ionic product of water (KwтАЛ) is 1.0imes10тИТ14. Since [H+]=[OHтИТ], taking the negative logarithm yields a pH of 7.
A neutral solution has equal concentrations of hydrogen and hydroxide ions.
The pH scale typically ranges from 0 to 14 at 25┬░C.
pH is temperature-dependent because the self-ionization of water is an endothermic process.
Determining acidity and basicity in chemical laboratories
Biological systems maintaining blood pH around 7.4
Option B (7) is the correct scientific value at 25┬░C despite the official answer key error.
Option D (1) corresponds to a strongly acidic solution, not a neutral one.
B is correct тАФ The pH of a neutral aqueous solution at 25┬░C is 7 because hydronium and hydroxide ion concentrations are equal.
Do not assume pH 7 is always neutral at every temperature; heating water increases its self-ionization, lowering the neutral pH below 7.
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