Given the following standard reduction potentials, calculate the ion-product. for water at...

Given the following standard reduction potentials, calculate the ion-product. for water at 25°C:

2H+(aq) + 2e− H2(g) E° = 0.00V

2H2O(l) + 2e− H2(g) + 2OH−(aq) E°=−0.83 V