What percentage of the water molecules undergo ionization in pure water (ph = 7.0)? h2o ⇌ h+ + oh– hints you will need to think/calculate how many moles of protons per liter are there at ph 7.0? how many moles of water molecules per liter had to break into protons and hydroxide ions at that ph? how many moles of water are there in one liter of water (answer to the previous question! ) with figuring out the last two points you should be able to calculate the percentage of moles per liter of water that broke down into protons and hydroxide ions at ph 7 out of the total moles per liter of water. group of answer choices