Write equations for the dissociation of compounds in water.

Write equations for the dissociation of compounds in water.

Molecular Compounds

These are usually non-electrolytes. They do not dissociate to form ions. Resulting solutions do not conduct electricity.

Example: CH3OH(l)  CH3OH(aq)

Molecular Acids

These are molecules that can partially or wholly dissociate, depending on their strength.

Example: Strong electrolyte H2SO4  H+(aq) + HSO4–(aq) (100% dissociation)

Example: Weak electrolyte HF  H+(aq) + F–(aq) (<100% dissociation)

OBJECTIVES

In this experiment, you will

 Write equations for the dissociation of compounds in water.

 Use a Conductivity Probe to measure the conductivity of solutions.

 Determine which molecules or ions are responsible for conductivity of solutions.

 Investigate the conductivity of solutions resulting from compounds that dissociate to produce different numbers of ions.

MATERIALS

LabQuest 0.05 M NaCl LabQuest App 0.05 M CaCl2 Vernier Conductivity Probe 0.05 M Fe(NO3)3 ring stand 0.05 M HC2H3O2 utility clamp 0.05 M H3PO4 250 mL beaker 0.05 M H3BO3 wash bottle and distilled water 0.05 M HCl tissues 0.05 M CH3OH (methanol) H2O (tap) 0.05 M C2H6O2 (ethylene glycol) H2O (distilled)

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