# Chapter 18 - Ionic Equilibria I: Acids and Bases - Exercises - The Autoionization of Water - Page 743: 16

There are 1000 hydronium ions for every 10 billion molecules of water.

#### Work Step by Step

$10$ $Billion = 10,000,000,000 = 10^{10}$ - Let's do a simple proportion calculation: $\frac{1 Water}{10^{-7} Hydronium} = \frac{10^{10}Water}{x}$ $10^{7} = \frac{10^{10}}{x}$ $x = \frac{10^{10}}{10^7}$ $x = 10^3 = 1000$ $Hydronium$ $ions$

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