Question

Experiment Properties of Solutions 112/ Roll No. Name: Section:__ Date: Post-lab Questions 1. Did you observe a difference in conductivity of deionized water and tap water. If yes, explain why there is a difference 2. What was the conductivity of solid sodium chloride? What was the conductivity of the mixture when water was added to the salt? Explain your observations 3. Indicate whether solutions of each of the following contain (a) only ions, (b) only molecules, or (c) mostly molecules and a few ions. Compound Type of particles in aqueous solution 1. Naci 2. NaOH 3. CHOH (Ethanol) 4. HCI 5. CH,COOH (Acetic acid) 6. NHU

Answer 1

ANSWER-1

deionized water is water without ion while  tap water contain ions ,

CONDUCTIVITY increase on increase in ion in the solution

so the difference in conductivity observed because of DEIionized water do not have ions so do not show conductivity and tap water have different type of ion like H+ OH- Ca+2 etc because of this its show conductivity

ANSWER 2

solid NACl donot show conductivity because it is in crystalized form and no ion free for conductivity but in solution it dissociate into Na+ and Cl- that's why show conductivity

ANSWER-3

ONLY IONS - strong electrolyte give only ion in solution it dissociate completly

ONLY MOLECULE- Covelent compound do not dissociate into water

mostly MOLECULE FEW IONS - WEAK ELECTROLYTE GIVE FEW ION IN THE SOLUTION

NaCl (strong electrolyte)give only ion in solution Na+ +Cl-

NaOH(strong electrolyte) give only ion in solution Na+ +OH-

C2H5OH(NON ELECTROLYTE)give only molecule in solution

HCl(strong electrolyte) give only ion in solution H+ +Cl-

CH3COOH (WEAK ELECTROLYTE) give few ion mostly molecule in solution H+ , CH3COO-,CH3COOH

NH3 (WEAK ELECTROLYTE)give few ion mostly molecule in solution NH4+,NH4OH