Download - N H 2 O Na K
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Warm up 9/19 & Lab Turn in*Identify the following symbols & identify
whether they are Elements (E) or Compounds (C).
N H2O Na K
H2SO4 HCl Cl NaCl
Write the equation: H2O+ H+ H3O + What are the products and what are the reactants?
*Staple pages 63-65 and put in basket in rear of classroom.
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ACIDS, BASES, AND pHpp. 39-44
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WaterPolar (covalent) compound
Water has a positive (+) and negative (-) “pole”
(+) is due to H and (-) is O
• acts like a magnet with + attracted to –
• pulls apart molecules like NaCl (ionic bond)
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WaterBonding
covalent bonds hold H2O together
hydrogen bonds hold molecules of H2O
Covalent > Hydrogen
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Acids and Bases H2O = water H+ = hydrogen ion OH- = hydroxide ion
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Acids and Bases H2O H+ + OH-
H+ reacts with H2O
H2O + H+ H3O+ (hydronium) H3O+ more commonly written as H+
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Acids Acids: H+ > OH- pH less than 7 Acid Properties: tastes sour, highly
corrosiveEX. HCl, H2SO4
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Bases Bases: OH- > H+ pH more than 7 Base Properties: tastes bitter, feel slimy EX. NaOH, Mg(OH)2
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pH power of Hydronium
measures acidity (from 0-14) and how much H3O+/H+ is present. The closer to 0, the more the H3O +/H+
0 up to 7 = acid 7 = neutral over 7 = base/alkaline Can use indicators to tell the pH ( phenol red,
pH paper, litmus, BTB)