In pure water, some of the molecules ionize according to the equation H2O→H+ + OH−. The extent of the ionization increases with temperature. A student heats pure water and records the measured pH at 50°C as 6.6. Based on this information, what mathematical relationships gives the pOH pOH of pure water at 50°C?

Answer : The mathematical relationships gives the pOH of pure water at is,

Explanation :

As we are given that the pH at is, 6.6.

Now we have to determine the mathematical relationships gives the pOH of pure water at .

As we know that:

The ionization of water is:

The expression for dissociation constant for water is:

taking logarithm on both side, we get:

Taking negative sign on both side, we get:

As we know that the value of is 14 at 25-50°C.

So,

or,

Therefore, the mathematical relationships gives the pOH of pure water at is,

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.