Bunuan

Tolentino

PROCEDURE

(1) 0.2 g Fe

filings 0.2 g mothballs

(ground)

0.2 g tables

salt

Mix

Add 2 strips Mg

ribbon and a pinch

of food coloring

Scatter mixture on

a piece of paper

Pass a magnet

underneath

the paper

Save the

separated

components

(2) Place mixture

(from 1) in a 50

ml beaker

Add 30 mL of

water

Heat gently until

solids deposit on the

walls of the funnel Filter

mixture

Put a piece of perforated

filter paper on top of evap.

dish containing the residue;

place inverted funnel w/

cotton in its tip on the filter

paper

Save the filtrate

(mixture in flask);

transfer residue to

evaporating dish

Save deposit on

funnel and residue

on evap. dish

(3) Boil the filtrate then add

pinch of activated

charcoal

Continue boiling

until mixture is

about 20 mL

Filter the mixture and save

filtrate in test tube.

Which substance was

separated?

(4)

Add 1 mL hexane. What is the color of the hexane

layer? The aqueous layer?

To 2 mL filtrate from

#3b, add a crystal of

iodine and shake well

Separate the two layers using

medicine dropper. What method of separation is employed

here? What properties of the mixture must

be considered in this method of

separation?

Evaporate aqueous

layer to dryness Identify the residue.

Evaporate hexane

layer slowly (in a

hood). Identify the

residue.

(1) Place small amounts of Fe,

Mg, iodine and mothballs

(from part A) in separate

test tubes

Observe for evolution of gas. Test the

gas with a glowing splinter.

Which is/are metallic? Nonmetallic?

Add 10 drops of 0.1

M HCl. Cover w/

stopper immediately

(2)

Place the ash in a test

tube, add 5 mL water and

shake the test tube

Heat a piece of Mg

ribbon directly over

blue flame until it

burns

Test for

acidity/alkalinity of

solution using litmus

paper

(3) (to be performed in a hood)

Thrust tip of glass

rod over blue flame

for 1 minute

Shake test tube and

test

alkalinity/acidity of

solution

Add 1 mL

water

Collect the fumes

in a test tube and

stopper with cork

Dip heated tip into

powdered sulfur placed

on watch glass

(1) a b c

Heat test tubes with

low flame and

observe if there are

visible results

Cool test tube

and examine

upper portion of

the walls of test

tube

Place a pinch of Fe,

mothballs, food

coloring and table salt

in separate 20 mL test

tubes

What type of

change has taken

place? What are the

experimental

evidences for this

type of change?

Recall

procedure 2

and 3 of

Part B.

(2)

Record your

observation

What type of

change took

place?

Add 10 drops

of 0.1 M HCl

to each

Place small piece of Fe

and Mg in 2 separate

test tube

(3)

Record your

observation

What type of

change took

place?

Add 10 drops of

FeCl3to each

Place small piece of Fe

and Mg in 2 separate

test tube

(4)

Add a piece of

red litmus

paper.

Evaporate to

dryness

Place all of the

filtrate saved from

experiment A in an

evap. dish

RESULTS

(1) Fe filings were separated from the mixture

-- this is because Fe filings are metallic

(2) The residue filtered were mothballs.

(3) At first, activated charcoal was suspended

in the liquid. It settled at the bottom of the

beaker after a while.

(4)

b. Color of hexane layer was clear pink. The aqueous layer was clear yellow.

c. Solvent-extraction was used to separate the 2 layers. The property of the two liquids to be considered when using this process is that they should be immiscible to each other.

d. Residue:

e. Residue:

1. Bubble formation was observed in Mg and Fe.

Mothballs and iodine were non-metallic while

Fe and Mg were metallic.

2. The Mg ribbon was basic since the red litmus

paper turned blue

3. The heated rod went into fire when contact was

made with sulfur. The flame on the rod, when

placed in the test tube was put out and yellow

fumes were collected. When added with water,

the solution was found to be acidic.

(1) a. After heating:

- iodine was liquefied and turned violet in color.

Small crystals appeared on the walls of test tube.

- mothballs liquefied and turned orange; moisture

and white spots appeared on the test tube wall

-in the test tube with Fe, orange precipitates

formed on the upper walls of the test tube.

- there were no visible reactions in the test tube

containing table salt

b. Spots of the substance formed on the upper

wall of test tube.

Physical reaction occurred.

c. Re part B, procedure 2: Chemical reaction

occurred, one indication is the solution

becoming basic.

Part B, procedure 3: Chemical reaction took

place; mixture became acidic.

(2) Bubbles were formed indicating chemical

change in Fe upon addition of HCl. The

formation of bubbles in Mg were faster,

meaning the reaction rate was faster in Mg.

(3) In Fe, bubbles were formed. In Mg ribbon,

the mixture turned yellow then to and

bubbles formed.

(4) Basic; red litmus paper turned to blue

end