CHEMISTY

POSTLAB REPORT

GROUP 1

Definitions

• Solute-the substance being dissolved

• Solvent-the substance doing the dissolving (the larger amount)

• Solution- a homogeneous mixture of the solute and the solvent

• Solution= solvent + solute

• Aqueous (aq)= water solution

• Tincture= alcohol solution

• Amalgam= Mercury solution

• Electrolytes- A substance that when dissolved in water produces

a solution that can conduct an electric current

QUESTIONS

1.) When the circuit is closed, is there any current passing through the bulb?

TAP WATER

DISTILLED WATER

2.) How do electrolytes conduct electricity?

• "The presence of ions in solution is responsible

for the conduction and when the current passes

through the wires, it shows the movement of free

electrons through wire.

• Hence, the conduction is because of electrically

charged ions which can migrate to the opposite

charged electrodes under the influence of

voltage. This process of dissociation and flow of

ions in aqueous solution of electrolyte is known

as electrolysis.

• Why do strong acids and strong bases are classified as strong electrolytes while weak acids and weak bases are weak electrolytes?

HCl

NaOH NH3

HC2H3O2

Strong ElectrolytesCompletely ionized or dissociate when dissolved in

water (single arrow)

a. Soluble Ionic compounds (NaCl)

b. Strong acids (HNO3(aq), H2SO4(aq), HCl(aq))

HNO3--> H+ + NO3- (100% ionization)

c. Strong bases (KOH and NaOH)

KOH -->K + +OH - (100% dissociation)

***covalent substances ionize....ionic substances dissociate

Weak electrolytes

Slightly ionized in solution (double arrow)

a. Weak acids (acetic acid)

HC2H3O2 <==> H+ + C2H3O2-

b. Weak bases (ammonia)

NH3 + H2O <==> NH4+ + OH-

Nonelectrolytes

Nonelectrolytes conduct no current

No ions present in solution

a. alcohols, sugars

SUGAR solution

Watch this video….

Do our bodies

need

electrolytes???