Acids, Bases and pH

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Acids, Bases and pH
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1. Acids

• Any compound that GIVES OFF H ions in solution
• Ex. HCl H and Cl-
• Traits
• Sour
• ex. Juices, vinegar, HCl

Add water
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2. Bases

• Any compound that GIVES OFF OH- ions in solution
• Ex. NaOH Na and OH-
• Traits
• Slippery
• Ex. Soaps, detergent, ammonia

Add water
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3. Neutralization

• Equal amounts of acid and base together
• Acid (H)
• Base (OH-)
• HOH H2O
• As and Bs make salts when you have same amounts
• Ex.
• HCl (Hydrochloric acid) NaOH (Sodium
  hydroxide) ? H2O (water) NaCl (table
  salt)

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4. BUFFERS

• substances that react with strong acids or bases
  to prevent sudden pH change
• What do you take when stomach is upset?? (HINT
  What digestive factor is in the stomach??)
• Antacids (made of calcium carbonatea weak base!)

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5. pH scale

• measures the concentration strength of acids and
  bases.
• pH 0-6.9 acid
• Strong acids 1-3
• pH 7.1-14 base
• Strong base pH 11 - 14
• pH 7 neutral (water)

VIDEO (349) http//www.brainpop.com/science/matt
erandchemistry/phscale/
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6. Litmus paper

• Tests for Acids or bases
• Turns Red acidic
• Turns Blue basic

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Lets Practice pH activity

• YOU TRY Go to my website. Click on Living
  Environment Homepage. Then click on the link for
  The Biochemistry Page. Go to pH activity and
  complete each activity.
• Go to a computer and use the site below to
  conduct an investigation on acids and bases.

pH Scale activity
Watch VIDEO (349) http//www.brainpop.com/scienc
e/matterandchemistry/phscale/