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It can be concluded that local wisdom is a heritage from ancestors that is used to be a guideline in community life. It can be materials, knowledge, culture,
rule, system, etc. It comes from the community’s experiences. The local wisdom is collaborated with local knowledge. Local wisdom always exists in societies,
communities, and individuals. Due to the importance of local wisdom in lives and sustainability of community, children in the community should learn the wisdom.
Learning of the wisdom can be from daily live practices, but it can be efficiently taught in schools. Chemistry learning is potentially integrated by local wisdom.
Therefore Chemistry teachers should bring students to local wisdom practices in learning. It is based on the report of Fensham 2008: 14 who suggested students
connect learning to their life.
3. Local Wisdom in Purworejo
Local wisdom that is available in areas of Purworejo district consists of tourism areas, food, culture, natural resources, and village management. More
detailed explanations of the local wisdom from Purworejo are given below.
a. Goa Seplawan Seplawan Cave
Seplawan cave is located at approximately 20 km from Purworejo’s Town
Square. As other caves, Seplawan has interesting and artistic stalactites and stalagmites. The formation process of stalactites and stalagmites is a chemistry
reaction that needs to be learnt by students. Students need to observe the phenomena, and present their findings. As the location that is in tropical
atmosphere, Indonesia soil contains calcium carbonate CaCO
3
. Indonesia has
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many caves with beautiful and artistic stalactites and stalagmites throughout Indonesia regions.
Molecules of CO
2
in the air reacted with CaCO
3
and water to produce CaHCO
3 2
. Actually CaHCO
3 2
is unstable because HCO
3 -
ion can only be stabilized by the ion that has low charge density such as Na: 24 C mm
-3
. Ca
2+
charge density is 52 C mm
-3
. The reaction can be written like this: CaCO
3
s + CO
2
g+ H
2
Ol → Ca
2+
aq + 2HCO
3 -
aq. Calcium bi
carbonate then felt on the cave’s surface, and dropped from the roof of the cave producing stalactite and stalagmite. When it falls drop by drop,
calcium bicarbonate experiences dissociation to be CaCO
3
that forms stalactite and stalagmite Raharjo, 2014: 171.
CaHCO
3 2
aq → CaCO
3
s + CO
2
g +H
2
O l In other word, Ca
2+
can not stabilize HCO
3 -
. Then CaCO
3
was reformed. There is also the water that is flown under the cave which the electricity can be
investigated. b.
Pantai Jatimalang Jatimalang Beach
This place is located at Jatimalang Village, Subdistrict Purwodadi, Purworejo. Based on the history, this place had ever been as the place for
Japanese ship disembarkation. This place is potential in exploring chemistry chapter of electrolyte and non electrolyte solution because of the existence of salt
in sea water. Sea water may highly contain Sodium Chloride NaCl that is able to be dissociated to be Na
+
and Cl
-
. Beside that, it is able to conduct the electricity. It
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will be an example of electrolyte solution that can be investigated by the students
in chemistry learning. c.
Museum Tosan Aji Tosan Aji Museum
Museum Tosan Aji is a museum that exhibits the uniqueness of keris. As we know that keris is a weapon that is made of steel iron. It is like a sword that
has zigzag shape. Keris is from Hindustaan Mataram Kingdom. Since 25
th
of November 2005, keris has been patented as Indonesias’ weapon by UNESCO. In Java island,
there is a tradition for keris washing ceremony named Jamasan. This tradition is to wash keris on certain month in a year by an Empu Empu is a person that
makes and looks after keris. This tradition can be explained scientifically and related well to the main material of keris iron. Iron is corrosive. It means that the
annual tradition is necessary Rizki, Mudzakir, and Hernani, 2013: 46-47. In chemistry learning, students should explain the tradition of Jamasan that
can be related to the corrosion of iron. The students should explain the ways in Jamasan that can prevent the corrosion in keris scientifically.
d. Mangosteen and Durian
