Acids and Bases. General properties

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3

The amino acid glycine - amphoteric

It’s an acid and a base!

Loss of H+

Gain of H+

H2N-CH2-COOH

H3N+-CH2-COOH

H2N-CH2-COO-

Chime structure

Slide 21

The amino acid glycine - Zwitterion formation

Transfer of H+ from carboxylic acid group to amine group.

H2N-CH2-COOH

H3N+-CH2-COO-

+

-

A dipolar ion forms.

intramolecular acid-base reaction

Chime structure

Slide 22

Show how water can be amphoteric.

H2O

Slide 23

Dilution

water (solvent)

solute

concentrated, Minitial

diluted, Mfinal

adding water lowers the solute concentration

moles of solute remain constant

Vinitial

Vfinal

molesinitial = molesfinal

Mfinal x Vfinal = Minitial x Vinitial

Slide 24

Titration Calculation

HCl + NaOH  NaCl + HOH

at equivalence point: moleHCl = moleNaOH

moles = M x VL

Macid x Vinitial acid = Mbase x Vburet

A way to analyze solutions!

indicator