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Published byHope Dean Modified over 8 years ago
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pH Scale & Neutralization Reactions
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pH Scale pH: A measure of how acidic or basic (alkaline) a solution is. The pH scale is a numerical scale ranging from 0-14 that compares the acidity of solutions. 0-6.9999: Acidic 7: Neutral (neither acidic or basic) 7.00001-14: Basic
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Some examples: SubstancepHAcidic or basic? Milk6 Baking soda8.3 Tomatoes4 Bleach12 Stomach acid1.5 Draino13 Acidic Basic Acidic Basic Acidic Basic
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Impact of pH Farming pH of soil highly impacts which plants can grow in certain areas and which cannot. i.e: Corn prefers slightly acidic soil, beans prefer slightly basic. Consumer Products Most skin care and shampoo products are neutral (pH=7) Cleaners are usually highly basic and have HHPS symbols to indicate it. Swimming Pools To keep biologic organisms from growing pH needs to be between 7.2-7.8 Anything above / below can cause irritation to skin & eyes.
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Neutralization Reactions Occur between an acid and a base. Both are typically ionic compounds. Skeleton equation: Acid + Base -> Water + Salt (ionic compound) Using hydrochloric acid and sodium hydroxide (base): HCl(aq) + NaOH(aq) -> H 2 O(aq) + NaCl(aq)
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Antacids Your stomach produces a solution of hydrochloric acid (pH = 1.5) Stomach acid can lead to irritation (heartburn) of the stomach lining and lining of the esophagus. Antacids are designed to neutralize the acid. Tums (Calcium carbonate) and stomach acid: CaCO 3 + 2HCl -> CO 2 + H 2 O + CaCl 2
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Homework P.275 #2-4,6 P.281 #1,2,7 Neutralization worksheet
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