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Chemistry Unit Five. Acids and Bases. Produces H + ions in water (hydronium) Formula starts with H Sour taste Break down metals Poisonous and corrosive to skin pH less than 7. Produces OH - ions in water (hydroxide) Formula ends with OH Bitter taste, slippery feel

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chemistry unit five

Chemistry Unit Five

Acids and Bases

acids and bases
Produces H+ ions in water (hydronium)

Formula starts with H

Sour taste

Break down metals

Poisonous and corrosive to skin

pH less than 7

Produces OH- ions in water (hydroxide)

Formula ends with OH

Bitter taste, slippery feel

Break down fats & oils

Poisonous and corrosive to skin

pH greater than 7

Acids and Bases
ph scale
pH Scale
  • Numeric scale that shows the acidity or basicity (alkalinity) of substances.

0 7 14

Strong Acid Weak Acid Neutral Weak Base Strong Base

ph indicators
pH Indicators
  • Chemical substance that changes color in an acid or a base.
  • pH paper; paper strips dipped in universal indicator; red in acid, green in neutral substance, purple in base: match the color to a number on the vial to determine pH
  • Litmus paper; paper strips dipped in red and blue litmus; If red stays red and blue turns red = acid

If red turns blue and blue stays blue = base

If red stays red and blue stays blue = neutral

litmus test
Litmus Test
  • Tells definitively whether the substance is an acid or base. “Litmus Test”
  • Dip one red and one blue strip & check results:

Red, Red = Acid

Blue, Blue = Base

Red, Blue = Neutral

neutralization reactions
Neutralization Reactions
  • When an acid is added to a base, they neutralize each other. (ie, the end products are neutral)
  • Acid + Base  Salt + Water

HCl + NaOH  NaCl + H2O

H2SO4 + Al(OH)3  Al2(SO4)3 + H2O

  • Salt – the neutral product of an acid/base rxn
write balanced chemical equations for the following reactions
Write Balanced Chemical Equations for the following Reactions.
  • Sulfuric acid and Calcium hydroxide
  • Hydrobromic acid and Aluminum hydroxide
  • Phosphoric acid and sodium hydroxide
  • Name the salt formed in each reaction.
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