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Acids & Alkalis In Everyday Life

Acids & Alkalis In Everyday Life. Today’s Lesson. Some recapping from last lesson Acids & Alkalis in everyday life Experiment. Basics. Acid + Metal Hydroxide  Metal Salt + Water Acid + Metal  Metal Salt + Hydrogen Acid + Metal Carbonate  Metal Salt + Water + Carbon Dioxide

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Acids & Alkalis In Everyday Life

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  1. Acids & Alkalis In Everyday Life

  2. Today’s Lesson • Some recapping from last lesson • Acids & Alkalis in everyday life • Experiment

  3. Basics • Acid + Metal Hydroxide  Metal Salt + Water • Acid + Metal  Metal Salt + Hydrogen • Acid + Metal Carbonate  Metal Salt + Water + Carbon Dioxide • Acid + Metal Oxide  Metal Salt + Water

  4. Neutralization • What makes something an acid?? • For Hydrochloric Acid: • HCl (aq)  H+ (aq) + Cl- (aq) • What makes a base a base? • For Sodium Hydroxide: • NaOH (aq)  Na+ (aq) + OH- (aq)

  5. Neutralization Reaction • Below is an example of a neutralization reaction: • HCl (aq) + NaOH (aq) NaCl (aq) + H2O (l) • As ions, you would write it like this: • H+ (aq) + OH- (aq)  H2O (l) • Note how the Hydrogen and Hydroxide form water!

  6. Let’s Get Neutral • Acids and bases are commonly used as cleaning products. • There are also different ways in neutralize different problems: • Insect stings: these are acidic so adding a weak alkali (like baking soda or calamine lotion can get rid of the sting • Indigestion: Your stomach has acid in it – so if your stomach gets unsettled acid can go up your esophagus. Adding baking soda can get rid of the problem

  7. Continued • Soil treatment. Different plants like to grow at different pH levels. If the soil is acidic, you can add a alkali such as lime (not the fruit). If it’s alkali, you can add a weak base. • Factory Waste. Factory waste often contains acid. Slacked lime can be used to neutralize the acid to make salt and water. What other problems can this cause??

  8. Acid Rain • Adding certain compounds in the air can cause acid rain. Below are some examples: • Carbon Dioxide can make carbonic acid • Sulfur dioxide can make Sulfuric Acid • Nitric Oxides can make Nitric oxide • Many older buildings are made of limestone, which can become corroded from acid rain.

  9. Questions • Read page 50/51 and answer Q1-6 in your book. Remember to include the question and write in sentences.

  10. Experiment • Today, there will be a number of different solutions. Your job is to do the following: • In your book, predict which you think is an acid, neutral or alkali. • Test using the litmus paper (red and blue) • Test using the universal indicator • Test using the data logger (time dependant) • Was your prediction correct or incorrect? Explain why. • Mention which is the most useful way to measure pH, along with the most usable.

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