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ACTIVITY To help you meet this "dragon" perform the experiment: Crush a few leaves of cabbage in a container with water. Filter and place in a beaker with a small amount of sago, leaving at rest for about 10 minutes. Add a little more water and cook to cook, without stirring. Separate four beakers. In the first place the beaker 50 ml of a solution of calcium chloride CaCl In the second place the beaker 20 ml of hydrochloric acid HCl, 0.10 mol / L (label). In the third place the beaker 30 ml of a solution of sodium hydroxide NaOH 0.10 mol / L (label). in the fourth beaker and place 20 ml of hydrochloric acid and add 30 mL of sodium hydroxide solution (label). Observe the drawings: Repeat with each beaker (do not put the sago in all the beakers at the same time). You can do this experiment replacing the cabbage by other indicators (cranberry juice, wine, flower petals, etc..). What happened to the balls of sago in each solution? Why? What happened when you put HCl and NaOH in the same beaker? How the indicators? As the name says, they indicate the environment where they are, getting a different color depending on whether they are in the presence of substance with characteristic acidic or basic. For example, phenolphthalein, a much used is colorless in acid medium and red in basic medium. After all, as is the behavior of substances that act as acid or base? And what does all this have to do with the "Dragon" in your stomach? The Chemistry of Every Day
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AKTIVNOST Da bi vam pomoći ispuniti taj "Zmaj" izvesti eksperiment: Lomiti nekoliko listova kupusa u posudu s vodom. Filter i mjesto u posudi s malom količinom sagoa, ostavljajući ostatak za oko 10 minuta. Dodajte malo više vode i kuhati kuhati, bez miješanja. Odvojite četiri čaše. U prvom redu posuda 50 ml otopine kalcijevog klorida CaCl Na drugom mjestu posuda 20 ml klorovodične kiseline HCl, 0,10 mol / L (label). U trećem mjestu posuda 30 ml otopine natrijevog hidroksida NaOH 0.10 mol / L (oznaka). u četvrtom posudu i stavite 20 ml klorovodične kiseline i dodati 30 ml otopine natrijevog hidroksida (oznaka). Poštujte crteže: Ponovite sa svake čaše (ne stavljajte Sago u svim čaše u isto vrijeme). To možete učiniti ovaj pokus zamijenivši kupus drugim pokazateljima (sok od brusnica, vino, cvjetnih latica, itd..). Što se dogodilo s kuglicama sagoa u svakoj rješenje? Zašto? Što se dogodilo kad ste stavili HCl i NaOH u istoj posudi? Kako su pokazatelji? Kao što ime kaže, oni ukazuju na okolinu gdje su, uzimajući različite boje, ovisno o tome jesu li u prisutnosti tvari s karakterističnim kiselih ili osnovnoj. Na primjer, fenolftalein, koliko se je bez boje u kiselom mediju, a crveno u bazičnoj sredini. Uostalom, kao što je ponašanje tvari koje djeluju kao kiseline ili baze? A što se sve to ima veze s "Zmaj" u trbuhu?