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Identifying Acids, Bases, and Salts Using Litmus Tests: A Practical Guide

Learn to classify common household and school solutions as acids, bases, or salts using red and blue litmus paper safely and effectively.

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Identifying Acids, Bases, and Salts Solutions found at home and in school that react with litmus indicator
Learning Objective • • Identify common solutions as acids, bases, or salts. • • Use red and blue litmus paper to classify substances safely.
What Are Acids and Bases? 🧪 What is an Acid? An acid is a substance that has a sour taste (do not taste chemicals), reacts with certain metals, and turns blue litmus paper red. Characteristics of Acids •🍋 Usually found in citrus fruits and vinegar •🔵 Turn blue litmus paper red •⚠️Some acids are strong and can be corrosive Examples •Lemon juice •Vinegar •Orange juice •Soft drinks •Dilute hydrochloric acid (laboratory use)
What is a Base? A base is a substance that often feels slippery and turns red litmus paper blue. Bases are also called alkalis when they dissolve in water. Characteristics of Bases •🧼 Feel slippery like soap •🔴 Turn red litmus paper blue •⚠️Some bases are strong and can be corrosive Examples •Soap solution •Baking soda solution •Toothpaste •Milk of magnesia •Dilute sodium hydroxide (laboratory use)
What is a Litmus Indicator?
What is a Litmus Indicator? A litmus indicator is a special paper or solution used to determine whether a substance is an acid or a base (alkali). It changes color depending on the type of solution it is placed in.
How Litmus Paper Works Type of Litmus Paper In an Acid In a Base In a Neutral Solution Blue Litmus Paper Turns red Stays blue No change Red Litmus Paper Stays red Turns blue No change
What is a Litmus Indicator • • Blue litmus turns RED in acids. • • Red litmus turns BLUE in bases. • • No color change usually indicates a neutral solution (such as many salt solutions).
Common Acids • Home: vinegar, lemon juice, soft drinks • School: dilute hydrochloric acid (lab use) • Blue litmus → Red
Common Acid Where It Is Found Main Acid Present 🍋 Lemon juice Lemons Citric acid 🍶 Vinegar Kitchen Acetic acid 🍊 Orange juice Oranges Citric acid 🥤 Soft drinks (cola) Beverages Carbonic acid and phosphoric acid 🍅 Tomato juice Tomatoes Citric acid and malic acid 🥣 Yogurt Dairy products Lactic acid Examples of Common Acids Many acidic substances are found at home, in school, and in nature.
Common Bases • Home: baking soda solution, soap solution • School: sodium hydroxide solution (lab use) • Red litmus → Blue
Common Base Where It Is Found Main Base Present 🥄 Baking soda solution Kitchen Sodium bicarbonate (NaHCO₃) 🧼 Soap solution Bathroom/Laundry Alkaline soap compounds 🪥 Toothpaste Bathroom Mild alkaline ingredients (e.g., sodium bicarbonate) 🧴 Milk of magnesia Medicine cabinet Magnesium hydroxide (Mg(OH)₂) 🧽 Household ammonia Cleaning products Ammonia (NH₃) dissolved in water 🧺 Washing soda solution Laundry Sodium carbonate (Na₂CO₃) xamples of Common Bases Many basic (alkaline) substances are commonly found at home and in school.
Common Salts • Table salt solution (NaCl) • Epsom salt solution • Usually no change to red or blue litmus (neutral salts).
Property Acid Base Litmus Test Blue litmus → Red Red litmus → Blue Taste* Sour Bitter* Feel* May sting Slippery Examples Lemon juice, vinegar Soap, baking soda solution Acid vs. Base
Easy Way to Remember •❤️Acids turn Blue → Red •💙 Bases turn Red → Blue
Activity • Test safe teacher-approved solutions. • Record litmus color changes. • Classify each as acid, base, or salt.
Safety • • Never taste chemicals. • • Wear safety goggles. • • Wash hands after the activity. • • Follow teacher instructions.
Summary • Acids: Blue → Red • Bases: Red → Blue • Neutral salts: Usually no change