Review about Analytical Chem

Review about Analytical Chemistry

Defining a Solution and it’s derivatives
• Solutions: are homogeneous mixtures of substances
composed of at least one solute and one solvent.
• homogeneous mixture: a uniform mixture of only one
phase
• solute: a substance that is dissolved in a solvent (e.g.,salt, NaCl)
• Solvent: the medium in which a solute is dissolved;
often the liquid component of a solution (e.g., water ).

The chemical formulavFor example,
• NH3(aq) : ammonia gas
(solute) dissolved in water(solvent)
• NaCl(aq) : solid sodium chloride (solute) dissolved in water (solvent)
• I2(l) : solid iodine (solute) dissolved in alcohol (solvent)
• C2H5OH(aq) : liquid ethanol (solute) dissolved in water(solvent)

Properties of Aqueous Solutions

Compounds can be classified as either electrolytes or nonelectrolytes.
Electrolytes are solutes that form solutions
that conduct electricity.
At this point we will restrict ourselves to compounds in Aqueous solutions.
Compounds are electrolytes if their aqueous solutions conduct electricity.
Compounds are nonelectrolytes if their aqueous solutions do not conduct electricity.

Question : How to test a solution if Electrolyte or Not?