Question

What is the concentration of H+ ions in pure water?

Answer 1

the concentration  of H+ ions in pure water is of ph value is 7 .

That's why  7 is neutral . pH is defined as pH =-log(H+)=log(1/H+)

it defined as negative logarithm of its H+ ion concentration.

Answer 2

the concentration of H+ ions in pure water(distilled water)is 0