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pH

pH . All the neat details on it. What is pH?. The pH scale is a number scale used for measuring how acidic or basic a solution is FYI: pH stands for the potential hydrogen [H] +. The pH scale. The pH scale runs from 0  14 0 7 is ACIDIC 7 14 is BASIC 7 is neutral.

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pH

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  1. pH All the neat details on it

  2. What is pH? • The pH scale is a number scale used for measuring how acidic or basic a solution is • FYI: pH stands for the potential hydrogen [H]+

  3. The pH scale • The pH scale runs from 0  14 • 0 7 is ACIDIC • 7 14 is BASIC • 7 is neutral

  4. More ph scale • Each unit of change represents a 10 times change in the degree of acidity or basicity • In other words, if tomatoes have a pH of 4 and grapes have a pH of 3, then that means that grapes are 10 times more acidic than tomatoes • If baking soda has a pH of 9 and bleach has a pH of 12, then bleach is 1,000 times more acidic than baking soda

  5. Example • How much more acidic are bananas than milk? • 10x • How much more basic is ammonia than oven cleaner? • 100x • How much more acidic are lemons than water? • 100,000x • How much more basic are eggs than soap? • 100x

  6. Recognizing acids • Acids are any solution with a pH of LESS THAN 7 • Chemical formulas for acids are usually written with an H on the left side of the formula • Example: HCl (hydrochloric acid), H2SO4 (sulfuric acid) • Acids form hydrogen (H+) ions when they dissolve in water

  7. Recognizing Bases • Bases are any solution with a pH of MORE THAN 7 • Chemical formulas for bases are usually written with an OH on the right hand side of the formula • Example: NaOH (sodium hydroxide), NH4OH (ammonium hydroxide) • Bases form hydroxide (OH-) ions when they are dissolved in water

  8. Practice Identify if the following compounds are acids or bases: • NaOH • HCl • HCH3COO • NH4OH • H2SO4 • Mg(OH)2 BASE ACID ACID BASE ACID BASE

  9. Reading • Read pages 225 – 229 for Friday • WARNING/ ANNOUNCEMENT: • You are doing 2 labs tomorrow. • Absolutely NO food or drinks • Be ON TIME!

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