Understanding the pH Scale
The pH scale runs from 1 to 14 and measures the concentration of hydrogen ions (H⁺) and hydroxide ions (OH⁻) in solutions. Think of it as a chemical measuring stick that tells you how acidic or basic something is.
Neutral solutions (like pure water) sit right in the middle at pH 7, where H⁺ and OH⁻ ions are perfectly balanced. As you move left towards 1, solutions become more acidic with increasing H⁺ ions. Move right towards 14, and you'll find alkaline solutions packed with OH⁻ ions.
You can actually create these solutions quite easily! Metal oxides and hydroxides dissolve in water to make alkalis, whilst non-metal oxides like carbon dioxide create acids when dissolved. Remember though - insoluble substances won't budge that pH reading at all.
Quick Tip: Acids include familiar substances like hydrochloric acid (HCl) and sulfuric acid (H₂SO₄), whilst alkalis include sodium hydroxide (NaOH) and potassium hydroxide (KOH).
