Water And Its Properties

Question 1

Properties of Water

Answer 1

1. Natural Solvent
2. Dispersion Medium
3. Medium for Biochemical Reaction

Question 2

Title of Experiment 1

Answer 2

Water and Its Properties

Question 3

water

Answer 3

• serves as natural solvent for mineral ions & other substances
  -dispersion medium for colloidal cells like protoplasm
• most abundant component of cells

Question 4

Materials (reagents) used for procedure 1: water as universal solvent

Answer 4

1. NaCl
2. Sugar
3. Gelatin
4. Lard
5. Ethanol
6. CuSO4
   – 0.5 g each
7. Add 1 ml water until dissolved
8. Add 1 ml CCl4 until dissolved

Question 5

solubility of the ff. to water:
1. NaCl
2. sugar
3. gelatin
4. CuSO4
5. Ethanol
6. Lard

Answer 5

all soluble except lard because of its non polar nature

Question 6

solubility of the ff. to CCl4:
1. NaCl
2. sugar
3. gelatin
4. CuSO4
5. Ethanol
6. Lard

Answer 6

all insoluble except:
lard - soluble - nonpolar
ethanol - slightly soluble - nonpolar hydrocarbon tail

Question 7

materials (reagents) for procedure 2: water as medium for biochemical reactions

Answer 7

1. 0.1 g dry powdered citric acid
2. 0.1 g sodium bicarbonate
3. add 10 mL water

Question 8

reaction of procedure 2 (water as medium for biochemical reactions) and its product

Answer 8

bubbling, fizzling, cloudy
CO2, H20, sodium citrate

Question 9

Procedure 3: properties of water solution materials/reagents (dialysis)

Answer 9

1. 30 mL 1% starch-NaCl mixture
   (put in dialysis bag that was soaked for 10 mins, rinse, and put in a beaker with deionized water)
2. 1 mL of dialyzate test with 0.1 M AgNo3

Question 10

Reaction in procedure 3 dialysis

Answer 10

• white precipitate (AgCl)
• silver chloride confirms presence of chloride ions

Question 11

Procedure 3: properties of water solution materials/reagents (osmosis)

Answer 11

10% sucrose solution

Question 12

Reaction in procedure 3 osmosis

Answer 12

solution has not migrate outward; water migrate inwards, balancing the concentration of the solutions on both sides of the membrane.

Question 13

dialysis definition

Answer 13

separation of particles in a liquid on the basis of differences in their ability to pass thru a membrane

Question 14

osmosis definition

Answer 14

movement of water molecules thru a permeable membrane from an area of lower concentration to higher solute concentration until equilibrium is reached

Question 15

Different functions of water in living system

Answer 15

• regulate body temp
• keeps organs hydrated
• protect cells
• carries nutrients and oxygen
• provides lubrication to the joint

Question 16

application of osmosis

Answer 16

plants absorb water from the soil thru their roots by osmosis

Question 17

application of dialysis

Answer 17

remove toxins from the blood with acute kidney disease patients