N H 2 O Na K

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.

ACIDS, BASES, AND pHpp. 39-44

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)

WaterBonding

covalent bonds hold H2O together

hydrogen bonds hold molecules of H2O

Covalent > Hydrogen

Acids and Bases H2O = water H+ = hydrogen ion OH- = hydroxide ion

Acids and Bases H2O H+ + OH-

H+ reacts with H2O

H2O + H+ H3O+ (hydronium) H3O+ more commonly written as H+

Acids Acids: H+ > OH- pH less than 7 Acid Properties: tastes sour, highly

corrosiveEX. HCl, H2SO4

Bases Bases: OH- > H+ pH more than 7 Base Properties: tastes bitter, feel slimy EX. NaOH, Mg(OH)2

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)