{"id":225834,"date":"2024-04-13T23:00:12","date_gmt":"2024-04-13T23:00:12","guid":{"rendered":"https:\/\/namso-gen.co\/blog\/?p=225834"},"modified":"2024-04-13T23:00:12","modified_gmt":"2024-04-13T23:00:12","slug":"what-is-pkw-value-not-at-25","status":"publish","type":"post","link":"https:\/\/namso-gen.co\/blog\/what-is-pkw-value-not-at-25\/","title":{"rendered":"What is pKW value not at 25?"},"content":{"rendered":"

The pKW value represents the negative logarithm of the ion product of water (KW) at a specific temperature. Normally, this value is measured at 25 degrees Celsius, where KW is equal to 1.0 x 10^-14. However, to understand the pKW value not at 25, we need to explore the concept of ionization and temperature dependence.<\/p>\n

When pure water is at equilibrium, it undergoes a process called autoionization, where a tiny fraction of water molecules dissociate into hydrogen ions (H+) and hydroxide ions (OH-). This phenomenon can be represented by the following equation: H2O \u21cc H+ + OH-.<\/p>\n

The equilibrium constant (KW) for this reaction is calculated as the product of the concentrations of H+ and OH- ions in water. At 25 degrees Celsius, the concentration of each ion is equal to 1.0 x 10^-7 M (moles per liter), resulting in KW = 1.0 x 10^-14.<\/p>\n

However, the pKW value is obtained by taking the negative logarithm (base 10) of KW, so at 25 degrees Celsius, pKW = -log10(1.0 x 10^-14) = 14.<\/p>\n

\n
\n

Table of Contents<\/p>\nToggle<\/span><\/path><\/svg><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n