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PH Scale of Common Materials pH 0 – Extremely acidic Battery acid (sulfuric acid) – highly corrosive, industrial use pH 1 – Very strong acid Stomach acid (hydrochloric acid) – essential for digestion Industrial acid solutions pH 2 Lemon juice – natural fruit acid Vinegar (acetic acid) – used in cooking and cleaning Cola and sports drinks – acidic due to phosphoric acid pH 3 Orange juice – citrus-based acid Soda and carbonated beverages Pickled foods pH 4 Tomatoes and tomato juice Acid rain – environmental concern, often around pH 4.0–4.5 Apples and grapes pH 5 Black coffee – slightly acidic due to organic acids Bananas Bread pH 6 Urine – varies depending on hydration and diet Milk – close to neutral but slightly acidic Saliva (resting state) pH 7 – Neutral Distilled water – baseline for neutrality Human blood (technically ~7.4 but considered close to neutral for reference) pH 8 Sea water – slightly basic due to dissolved minerals Eggs (especially egg whites) Baking powder (mildly basic when dissolved) pH 9 Baking soda (sodium bicarbonate) – common antacid Toothpaste (some types) Hand soap (mild base) pH 10 Milk of magnesia (magnesium hydroxide) – used to relieve indigestion Great Salt Lake water – mineral-rich, alkaline environment Some detergents pH 11 Ammonia solution (household cleaner) Window cleaners Mild bleach products pH 12 Soapy water – alkaline due to sodium salts Heavy-duty detergents Hair relaxers pH 13 Oven cleaner – contains strong bases like sodium hydroxide Household bleach (concentrated) pH 14 – Extremely basic (alkaline) Liquid drain cleaner – highly caustic, often pure sodium or potassium hydroxide Industrial degreasers Other Questions Related to PH Scales 1