Answer:
6.14
Explanation:
If the pH falls as temperature increases, this does not mean that water becomes more acidic at higher temperatures. A solution is acidic if there is an excess of hydrogen ions over hydroxide ions (i.e., pH < pOH). In the case of pure water, there are always the same concentration of hydrogen ions and hydroxide ions and hence, the water is still neutral (pH = pOH) - even if its pH changes.
The problem is that we are all familiar with 7 being the pH of pure water, that anything else feels really strange. Remember that to calculate the neutral value of pH from Kw . If that changes, then the neutral value for pH changes as well. At 100°C, the pH of pure water is 6.14, which is "neutral" on the pH scale at this higher temperature. A solution with a pH of 7 at this temperature is slightly alkaline because its pH is a bit higher than the neutral value of 6.14.
The pH of pure water at the temperature of 100°Celsius is 6.14.
At 100°C, the pH of pure water is 6.14, which is considered as "neutral" on the pH scale at this higher temperature. A solution with a pH of 7 at this temperature is slightly alkaline because its pH is a bit higher than the neutral value of 6.14. The pH is dependent on temperature means it changes as the temperature of a solution changes.
At room temperature, pH 7 is considered neutral at room temperature but at high temperature it is considered as basic. At high temperature, 6.14 is considered as neutral pH so we can conclude that the pH of pure water at the temperature of 100°Celsius is 6.14.
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