Percobaan osmosis pada kentang🥔
Summary
TLDRThis educational video demonstrates the osmosis experiment on potatoes, illustrating the process of water movement across a semipermeable membrane. The video shows potatoes of the same size placed in saltwater and plain water. After 30 minutes, the potato in saltwater shrinks and softens due to water loss through osmosis, while the one in plain water remains largely unchanged. The experiment explains the preservation of food through pickling in acidic or sweet solutions, causing cell death and preventing spoilage.
Takeaways
- 🧪 The experiment demonstrates osmosis in potatoes, showcasing changes in size and texture due to the solution they are placed in.
- 🥔 Potatoes are cut to a size of 4 cm for uniformity in the experiment.
- 💧 Two types of solutions are prepared: one with salt (hypertonic) and one without (hypotonic) to observe the effects on the potatoes.
- ⏱️ The potatoes are left to soak for 30 minutes to allow for observable changes.
- 📏 The potato in the hypertonic solution shrinks in size from 4 cm to 3 cm, indicating water loss.
- 🔍 The texture of the potato in the hypertonic solution becomes softer, indicating cellular dehydration.
- 📐 Conversely, the potato in the hypotonic solution expands slightly from 4 cm to 4.2 cm and becomes firmer due to water intake.
- 🌿 The experiment illustrates the principle of osmosis, where water moves across a semipermeable membrane from an area of lower solute concentration to an area of higher solute concentration.
- 🔬 The semipermeable nature of cell membranes is key to understanding how cells regulate water content.
- 🍲 The concept is applied in food preservation, where pickling in salty or sugary solutions can extend shelf life by causing cell death through osmosis.
- 🌟 The experiment concludes with a reminder of the practical applications of osmosis in everyday life and its importance in food science.
Q & A
What is the purpose of the experiment described in the script?
-The purpose of the experiment is to demonstrate osmosis by observing the changes in potato slices when placed in different solutions, specifically water and saltwater.
What materials are needed for the osmosis experiment on potatoes?
-The materials needed include potatoes cut into 4 cm pieces, salt, a spoon, a knife, and two glasses of water.
How much salt is added to the water for the experiment?
-One spoonful of salt is added to one of the glasses of water.
What is the initial size of the potato slices used in the experiment?
-The initial size of the potato slices is 4 cm in diameter.
What happens to the potato slice placed in saltwater after 30 minutes?
-The potato slice placed in saltwater shrinks in size, becomes softer in texture, and experiences a decrease in volume due to the loss of water from its cells.
What is observed in the potato slice placed in plain water after 30 minutes?
-The potato slice in plain water tends to not change much in size and remains hard in texture, indicating little to no change in volume.
Why does the potato slice in saltwater shrink?
-The potato slice in saltwater shrinks because the saltwater is hypertonic compared to the cell fluid, causing water to move out of the cells, leading to cell dehydration and shrinkage.
How does the experiment relate to the preservation of food?
-The experiment relates to food preservation by showing how osmosis can be used to kill spoilage bacteria and fungi by dehydrating them when food is soaked in a hypertonic solution like brine or sugar solution.
What is the term for the movement of water across a semipermeable membrane?
-The movement of water across a semipermeable membrane is called osmosis.
What happens to cells in a hypertonic solution?
-In a hypertonic solution, cells lose water, leading to cell shrinkage and a condition known as crenation.
What is the term for a solution that has a higher solute concentration than the cell fluid?
-A solution with a higher solute concentration than the cell fluid is called hypertonic.
What is the term for a solution that has a lower solute concentration than the cell fluid?
-A solution with a lower solute concentration than the cell fluid is called hypotonic.
Outlines
🥔 Osmosis Experiment with Potatoes
The speaker introduces themselves and sets up an experiment on osmosis using potatoes. They explain the preparation of the materials, which include cut potatoes, salt, a spoon, a ruler, and two glasses of water. The first step is to create a salt solution by dissolving a spoonful of salt in one of the glasses of water. Two potato pieces, each 4 cm in size, are then placed in the two glasses, one in the salt solution and the other in plain water. After 30 minutes, the potatoes are observed for changes in size and texture. The potato in the salt solution shrinks and becomes softer, indicating water loss from its cells due to osmosis. Conversely, the potato in plain water retains its size and becomes slightly larger and firmer due to water intake. The experiment demonstrates the concept of osmosis, where water moves through a semipermeable membrane from a hypotonic solution (plain water) to a hypertonic solution (salt water), causing cells to lose or gain water and change in size and texture. The speaker concludes by relating this to food preservation techniques, such as pickling, where the high acidity or sweetness of the pickling solution causes cells in food to lose water and die, thus preserving the food.
Mindmap
Keywords
💡Osmosis
💡Solute
💡Semipermeable membrane
💡Hypotonic solution
💡Hypertonic solution
💡Cell membrane
💡Potassium (K)
💡Crenation
💡Food preservation
💡Acidity
💡Sugar
Highlights
Introduction to osmosis experiment using potatoes.
Preparation of materials including cut potatoes, salt, spoon, and two glasses of water.
First step is to create a salt solution by adding salt to one glass of water.
Observation of the initial size and texture of the potatoes before the experiment.
Insertion of one potato piece into salt water and another into plain water.
Waiting period of 30 minutes for the potatoes to be submerged.
Comparison of the size change in the potato pieces after 30 minutes.
The potato in salt water shrank in size and became softer.
The potato in plain water showed minimal change in size and remained firm.
Explanation of osmosis as the movement of water through a semipermeable membrane.
The potato in salt water experienced plasmolysis due to hypertonic solution.
The potato in plain water absorbed water, becoming larger and firmer due to hypotonic solution.
Practical application of osmosis in food preservation through pickling and marinating.
The preservation technique causes cells around or in food to die by plasmolysis.
Conclusion of the experiment and its relevance to everyday life.
Expression of gratitude and hope for the experiment's usefulness.
Transcripts
Halo assalamualaikum warahmatullahi
wabarakatuh perkenalkan nama saya
melayani Spade kita dari kelas ABG ini
semester 4 dengan MPR 18110 0422 sini
saya akan nongol Percobaan osmosis pada
kentang sebelum kita melakukan Percobaan
osmosis pada kentang kita siapkan
terlebihdahulu bahan-bahannya yang
pertama ada kentang yang sudah dipotong
dengan ukuran 4 cm kemudian ada garam
sendok dan penggaris kemudian ada dua
gelas air Nah langkah pertama yang harus
kita lakukan dalam percobaan ini yaitu
kita membuat larutan garam terlebih
dahulu Masukkan satu sendok garam ke
dalam gelas yang sudah diisi air
kemudian aduk hingga rata lalu
Ayo kita ambil centang yang sudah
dipotong kita amati ukurannya ya tentang
pertama memiliki ukuran 4 cm tentang
kedua juga memiliki ukuran 4 cm dan
teksturnya keras masih keras TS nya
masih sama ya antara dokter kedua
kentang ini lalu tentang Pertama
masukkan ke air yang tidak di tidak
dilakukan dengan garam memudarkan kedua
masukkan ke dalam air sudutnya sudah
dilarutkan dengan garam lalu Tunggu
selama 30 menit setelah direndam selama
30 menit apa yang terjadi pada
masing-masing potongan kentang yang
sudah direndam dengan air garam dan air
biasa yang pertama kita ambil kentang
yang sudah direndam sama 30 menit lalu
kita mati perbedaannya ya pada awalnya
tentang berukuran 4 cm kan Nah sekarang
tentang berubah menjadi 3 cm atau
mengecil dan kita amati tekstur Ya
terserah juga
jadi lunak tidak keras seperti tadi
berubah tetap dan dia juga mengalami
perubahan ukuran sedangkan kentang yang
berada dalam air biasa cenderung tidak
mengalami perubahan kita ukur dulu pakai
penggaris ya tadi 4 cm sekarang tetap
menjadi 4 cm bahkan lebih dikit ya jadi
4,2 cm dan teksturnya tetap malah dia
kayak lebih keras gitu ini sebelah kiri
yang kekal dalam air biasa sebelah kanan
dengan direndam dengan air garam tuh
teksturnya beda ya lebih keras yang air
biasa ini air garam air garam lebih
lunak dan teksturnya mengecil pada kali
sama ya baru tadi sama nih tuh nah
percobaannya kita aman tadi adalah
Percobaan osmosis yaitu perpindahan air
melalui selaput sel yang bersifat
semipermeabel salah pusat sampai mebel
adalah selaput channel hanya bisa
ditembus oleh molekul-molekul air
slow Salsa pada kepada makhluk hidup dan
kamu potongan petang tadi itu bersifat
semipermeabel cairan larutan garam lebih
pekat daripada cairan dalam sel atau
bersifat hipertonis jadi air berpindah
dari dalam keluar sel itulah mengapa
potongan kentang yang direndam air garam
mengalami perubahan ukuran menjadi kecil
dan teksturnya menjadi lunak karena
tentang kehilangan air dalam sel-selnya
sel-sel itu mengalami krenasi sedangkan
air tawar atau biasa lebih encer
daripada cairan yang share ransel atau
bersifat hipertonik hipotonis jadi air
berpindah dari luar ke dalam sel karena
itu didesain kentang yang direndam air
biasa akan menjadi lebih besar dan
teksturnya keras akibat bertambahnya
volume dalam kehidupan sehari-hari kita
mengenal teknik pengawetan makanan
melalui pembuatan acar manisan dan
asinan dengan direndam dalam larutan
yang asam asin atau manis sekali
sehingga sel-sel
coba pembusuk yang hidup disekitar atau
dalam sel makanan yang akan diawetkan
akan mati karena mengalah karena
mengalami krenasi yaitu selnya mengerut
karena air keluar dari selnya bersifat
tersebut dinamakan osmosis itulah
kesampaian diperkirakan hari ini Terima
kasih semoga bermanfaat wassalamualaikum
warahmatullahi wabarakatuh
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