Question

the ph difference across the membrane of a glass electrode is 5.11 . how much voltage is generated by the ph gradient at 25 °c and at 37 °c?

Answer 1

The voltage generated by the pH gradient across the membrane of a glass electrode is 0.302 volts, regardless of temperature.

Step-by-step explanation:

The voltage generated by the pH gradient across the membrane of a glass electrode can be calculated using the Nernst equation. The Nernst equation is given by:

E = E' + (0.0591 V × log[H+])

Where E is the voltage, E' is a constant specific to the electrode, and [H+] is the hydrogen ion concentration. To calculate the voltage at 25 °C, we can substitute the pH difference of 5.11 into the equation and solve for E:

E = E' - 0.0591 V × pH

E = E' - (0.0591 V × 5.11)

E = E' - 0.302 V

Similarly, to calculate the voltage at 37 °C, we can substitute the pH difference of 5.11 into the equation and solve for E:

E = E' - (0.0591 V × pH)

E = E' - (0.0591 V × 5.11)

E = E' - 0.302 V

Therefore, regardless of temperature, the voltage generated by the pH gradient across the membrane of the glass electrode is 0.302 volts.