Water at 374°C and 218 atmospheres of pressure transforms into what is called a supercritical fluid, which behaves both as a liquid and as a gas. In a neutral solution of supercritical water the pH is...

Water at 374°C and 218 atmospheres of pressure transforms into what is called a supercritical fluid, which behaves both as a liquid and as a gas. In a neutral solution of supercritical water the pH is about 2. What is the concentration of hydronium ions in this neutral solution? What is the concentration of hydroxide ions? Why is supercritical water so corrosive?