# If the pH of Pure Water is 6.5, then Its Temperature Should be More Than 293K: PH (For CBSE, ICSE, IAS, NET, NRA 2022)

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# Title: If the pH of Pure Water is 6.5, then Its Temperature Should be More Than 293K

## The pH Scale

• In chemistry, pH is a scale used to specify the acidity or basicity of an aqueous solution.
• Acidic solutions are measured to have lower pH values than basic or alkaline solutions.
• This was the original definition of Sorensen in 1909, which was superseded in favor of pH in 1924.
• [H] Is the concentration of hydrogen ions, denoted [H +] in modern chemistry, which appears to have units of concentration.
• So, the thermodynamic activity of H + in dilute solution should be replaced by , where the standard state concentration . This ratio is a pure number whose logarithm can be defined.
• pH scale is logarithmic and inversely indicates the concentration of hydrogen ions in the solution.
• Buffers, pH, Acids, and Bases
• A solution with a high number of hydroxide ions is basic and has a high pH value.
• The pH scale ranges from 0 to 14, with a pH of 7 being neutral.
• To calculate the pH of an aqueous solution you need to know the concentration of the hydronium ion in moles per liter (molarity) .
• pH is then calculated using the expression:

## The pH of Pure Water is 6.5, then Its Temperature Should be More Than 293K

• The normal pH of water is termed to be 7 because it is neutral.
• Temperature and Pressure would be two factors, which would governs the Water characteristics and state.
• So, for the pH 6.5 being a little acidic to nullify it.
• Therefore temperature must be increased in order to compensate that neutrality.
• The ionization increases with temperature.
• So the amount of H + active in solution will increase with temperature, the pH should decrease.
• When there is decrease in pH of neutral water, it is normally assumed that the temperature is increased from room temperature
• When the pH of neutral water is 6.5, the temperature should greater than
• So, for the pH 6.5 being a little acidic to nullify it the temperature should be governed which is why must be increased in order to compensate that neutrality.

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