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Teacher:_______________________________ Date:__________________ Rating:______
Activity 1
Water, “Wat-er” You Made Of?
Objectives
In this activity, you should be able to:
1. carry out the electrolysis of water; and
2. identify the components of water.
Materials Needed
improvised electrolysis apparatus
5% sodium hydroxide (NaOH) solution
connecting wires (black and red insulation)
9V dry cell
test tube
plastic syringes will serve as “collecting
syringe”
incense or bamboo stick
safety matches
Procedure
1. Fill the sample container of the electrolysis apparatus
half-full with 5% sodium hydroxide (NaOH) solution.
2. Fill each “electrolysis syringe” with 5% sodium
hydroxide (NaOH) solution up to the zero mark. To do this,
insert the tip of the “collecting syringe” through the
hole of the plastic straw and suck out the air. Refer to
Figure 2. Initially, the plunger of the “collecting syringe”
should be in the zero position. The basic solution will
rise and fill the “electrolysis syringe” as you pull the
plunger of the “collecting syringe”.
3. When the solution reaches the zero mark, fold the
straw with the “collecting syringe”. Refer to the figure on
the right. Repeat the procedure for the other syringe.
Note: In case the 10mL syringe is used for sucking out the air,
you may need to repeat the suction of air to fill up the
“electrolysis syringe” with the basic solution.
4. Attach the connecting wires to the bottom tips of the
stainless screws. Attach the black wire to the negative (-)
terminal of the dry cell. Attach the red wire to the positive (+) terminal of
the dry cell. The stainless screw that is attached to the black wire is
the negative electrode; while the stainless screw that is attached to the
red wire is the positive electrode.