So why is water’s pH 7? Because pure water makes exactly the same number of H⁺ and OH⁻ ions. It’s like a cosmic seesaw. Neither side wins.
Think of it as a perfectly peaceful protest. Both ions show up in equal numbers. No yelling, no fighting. Just a silent, neutral equilibrium.
If you add lemon juice (acidic), you tip the scale. More H⁺ ions appear. The pH drops. Suddenly, water isn’t neutral anymore. It’s sour and reactive.
Properties of Water. - ppt video online download
If you add baking soda (basic), you tip the other way. More OH⁻ ions. The pH rises. Now it’s bitter and slippery. Water is a total chameleon.
Why 7? Why Not 6 or 8?
Great question, coffee buddy. It’s because the math behind pH is a logarithmic scale. Don’t let that word scare you. It just means each number is ten times different from the next.
At pH 7, the number of H⁺ ions is exactly 0.0000001 moles per liter. That’s a 1 with seven zeros in front of it. It’s a tiny, tiny amount. But it’s consistent.
If water had a pH of 6, it would have ten times more H⁺ ions. That would make it slightly acidic. And water is not naturally acidic on its own. It’s a pure, neutral blank slate.
Another reason? Temperature messes with things. Ice-cold water has a pH slightly above 7. Boiling hot water? It drops to around 6.5. But we still call 7 the standard because of room temperature.
