notes gb lab 09 colorful chemical clues 1
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Notes
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The student will:Distinguish between an acid and a base
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The student will:Recognize indicators that can be used to help identify acids and bases
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The student will:Use 4 different indicators to identify whether a substance is an acid or base
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The student will:Identify “pH”Describe what pH is and how it has a meaningful effect on us
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Acid BaseIndicator pH pH ScaleChemical PropertyReactivity
CombustibilityFlammability
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Let’s Go!
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A group of compounds which contain hydrogen and produce Hydrogen Ions (H+) when dissolved in water.
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Acids taste sour, conduct electricity and corrode metals.
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Acid compounds’ chemical formulas always begin with an H (a single Hydrogen atom) i.e. (HCl = Hydrochloric Acid)
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A group of compounds that produce hydroxide ions in a solution.
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Bases taste bitter, feel slippery, corrode metals and conduct electricity.
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Base compounds always end with an OH (NH4OH) = Ammonia
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A tool used to help identify wether a substance is an acid or a base
It indicates acid or base by changing color or displaying a digital reading
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A symbol used to represent the percent of the Hydrogen Ion (Acid Level) in a substance.▪Ranges from 1 (Acid) – 15 (Base)
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▪ One tool used with indicators that is used to indicate the strength of an acid or a base.
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▪ A value of 1 indicates a strong acid▪ Battery Acid (Sulfuric Acid; H2S O4)
▪ A value of 7 represents a neutral (our blood and saliva are a pH of 7)
▪ A value of 15 represents a strong base▪ Oven Cleaner, Draino, Ammonia, Soap
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A property of matter which describes the ability of a substance to create a new substance during a chemical reaction
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Examples:▪Reactivity▪Combustibility▪Flammability
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The tendency of a substance to undergo a chemical change either by itself or when mixed with another substance. http://www.youtube.com/watch?v=gRuoWkOlaHM http://www.youtube.com/watch?v=uixxJtJPVXk
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Describes if a substance is capable of igniting. I.e., Gas vapors, Natural Gas
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Describes if a substance is capable of burning i.e., Cloth, Rags, Paper, Wood etc.
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A chemical reaction between an acid and a base which produces water and a group of compounds called “ salts”.
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Now let’s tie it all together!
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Acids and Bases are all around us Acids can be strong or weak having a pH value of 1 – 6, 1 being the strongest, 6 being the weakest
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Strong acids can burn you; weak acids don’t 1 – HCl (Hydrochloric Acid) Strong
6 – Coffee Weak
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Acids and Bases are all around us Bases can be strong or weak having a pH value ranges between 8 – 15, 8 being the weakest and 15 the strongest
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Strong bases can burn you; weak Bases wontA value of 8 – 9 is weakHand soap, Detergent,
AmmoniaA value of 13 - 15 is strong. Oven Cleaner, Drain Cleaner
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Something that is “Neutral” has a pH of 7. (Our bodies are neutral.)
When an acid and a base are combined a process called “Neutralization” occurs.
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During neutralization the reactants (acid + base) combine to form two products..Water H2OA compound called a “Salt”
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Thank you for your cooperation!
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Copy and Answer these! What is “pH” and how is it measured?
What is an acid?What is a base?