Science Common Sense

1167 - What are the properties of common acidic and alkaline substances and their applications in life, as well as the acidic and alkaline properties of their aqueous solutions?

Let's learn about acidic and alkaline substances in a fun way.

Acidic Substances:

1. Lemon Juice (pH 2): It's sour and used in cooking, cleaning (removes stains), and as a disinfectant.
2. Vinegar (pH 2.4): Useful for cooking, cleaning, and as a natural preservative.
3. Baking Soda (pH 8.3, but can be acidic in aqueous solution): Helps with indigestion and as a natural cleaner.
4. Citric Acid (pH 2.2): Found in citrus fruits, it's used in food, cosmetics, and as a cleaning agent.

Alkaline Substances:

1. Baking Soda (pH 8.3, previously mentioned): Also used as an antacid and in toothpaste.
2. Washing Soda (pH 10.5): Good for cleaning and removing grease.
3. Soap (pH 9-10): Used for cleaning and personal hygiene.
4. Eggshells (pH 9): Contain calcium carbonate, which is alkaline and can neutralize acidic substances.

Applications in Life:

• pH Balance: Soaps and lotions help maintain skin's natural pH balance.
• Cooking: Acids like lemon juice enhance flavors, while alkaline substances like baking soda act as leavening agents.
• Cleaning: Acidic substances like vinegar and lemon juice remove mineral deposits, while alkaline substances like washing soda and soap clean grease and dirt.
• Medicine: Antacids like baking soda neutralize stomach acid.

pH Scale:

• pH 0-1: Strong acids
• pH 2-3: Acidic
• pH 4-5: Weakly acidic
• pH 6-7: Neutral (water)
• pH 8-9: Weakly alkaline
• pH 10-12: Alkaline
• pH 13-14: Strong bases

Remember, the pH scale measures how acidic or alkaline a substance is. This knowledge helps us use these substances correctly in our daily lives.