Acids and bases

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  • Hcl and aluminium bombAdd bung rather than screw top?
  • Acids and bases

    1. 1. Compounds<br />Compounds are groups of two or more elements that are bonded together.<br />
    2. 2. Common Chemical Compounds<br />NaCL<br />How many Sodium atoms?<br />How many Chlorine atoms?<br />
    3. 3. Common Chemical Compounds<br />C6H12O6<br />How many Carbon atoms?<br />How many Hydrogen atoms?<br />How many Oxygen atoms?<br />
    4. 4. Common Chemical Compounds<br />H20<br />How many Hydrogen atoms?<br />How many Oxygen atoms?<br />
    5. 5. Common Chemical Compounds<br />NaHCO3<br />How many Sodium atoms?<br />How many Hydrogen atoms?<br />How many Carbon atoms?<br />How many Sodium atoms?<br />
    6. 6. Acids and Bases<br />
    7. 7. What are Acids?<br />Acids are common<br />Some are dangerous and can burn your skin<br />Some are safe to eat and drink<br />Stomach acid helps digest food<br />explosion<br />
    8. 8. Acids<br />Definition <br />A group of compounds which behave similarly<br />All have low pH<br />Turn Litmus paper RED<br />All donate H+ ions in aqueous solution<br />Examples<br />Hydrochloric HCl<br />Sulfuric H2SO4<br />Nitric HNO3<br />
    9. 9. Acids<br />A dilute acid has lots of water and a small amount of acid<br />A concentrated acid has lots of acid and not much water so must be handled carefully <br />A strong acid releases lots of H+<br />A weak acid releases fewer H+<br />
    10. 10. What are Bases (Alkalis)?<br />In our home we often use bases to clean things. Eg Bleach and toothpaste<br />Some things are not acids or bases, we say that they are neutral. Eg Water<br />
    11. 11. Bases<br />Definition<br />A family of compounds that behave similarly<br />Have a high pH<br />Turn litmus BLUE<br />All donate OH-<br />Examples<br />Ammonia NH3<br />Sodium Hydroxide NaOH<br />
    12. 12. Measuring acid strength?<br />To decide if something is an acid or a base we can use an indicator.<br />Litmus and Universal Indicator are examples of indicators.<br />They change colour depending on if they are in an acid or a base.<br />
    13. 13.
    14. 14. Working with Indicators<br />Red litmus turns BLUE in the presence of Bases<br />Blue litmus turns RED in the presence of acid<br />Acids and bases react together in a NEUTRALISATION reaction<br />
    15. 15. Acid Reactions<br />Acid + Base  Salt + Water<br />Acid + Metal Salt + Hydrogen<br />
    16. 16. Antacid – (Anti-Acid)<br />Acid + Base = Neutral Solution<br />Stomach Acid<br />Mylanta – Base<br />The two together make a neutral solution.<br />
    17. 17. Demonstration<br />NaOH + HCL  NaCL + H20<br />Base<br />Acid<br />Neutral Solution<br />Turns green in indicator<br />Turns blue in indicator<br />Turns red in indicator<br />

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