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

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  • This was the original definition of Sorensen in 1909, which was superseded in favor of pH in 1924.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:

Average pH of Common Solutions

Average Ph of Common Solutions

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.