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Now we will analyze the results in relation to the principle of Le Chatelier, to understand the color changes of the solutions of chromate and dichromate. The chemical reaction which occurred can be represented by: By adding HCl to the reaction, you added ions H and caused a disturbance to the chemical equilibrium. The system tried to readjust seeking balance again. Therefore, when the concentration of H increased, the system tried to consume what was added (yielding dichromate, orange) and return to equilibrium. By adding NaOH to the reaction, you have added ions OH ions which react with H , this means that the concentration of H decreased. Therefore, a disturbance has occurred again at chemical equilibrium. Decreased when the ions H , the system sought to replace what was removed (producing chromate, yellow) and returning to balance. The same happens when moved temperature and pressure, namely, the system looks for neutralizing the sustained DISTURBANCES. That such conduct another very interesting experiment? Place in a dry test tube, a few crystals of lead nitrate Pb (NO Warm to produce a gas reddish-brown (the heat, keep the test tube tilted and moving). Do not suck gas. Quickly close the tube with a stopper. In a glass beaker, put cold water with ice and, in another beaker, place hot water. Immerse the test tube in the beaker with ice water (carefully). Wait a few minutes and observe. Note. Now immerse the test tube in the beaker of hot water. Wait a few minutes and observe. Note. The chemical reaction that occurred in the experiment can be represented by: The colorless reddish-brown What was the gas produced when you heated the test tube? What happened when you placed the test tube in co- po with ice water? When you increase the temperature again, there was another shift in the balance of the system which now has more NO and less N The As you showed this change? You may have noticed that often a bottle of sparkling mineral water is not forgotten in the freezer pops. But when we open it bursts. Why?
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Sada ćemo analizirati rezultate u odnosu na principu Le Chatelierov, razumjeti promjene boje od rješenja kromat i dikromat. Kemijska reakcija koja se dogodila može se prikazati: Dodavanjem HCl do reakcije, što dodaje iona H i izazvao nemir na kemijske ravnoteže. Sustav pokušava preurediti traži ravnotežu opet. Stoga, kada je koncentracija H povećao, sustav pokušao konzumirati ono što je dodano (popustljiv dikromat, naranče) i vratiti u ravnotežu. Dodavanjem NaOH do reakcije, koje ste dodali iona OH ioni koji reagiraju s H , to znači da je koncentracija H smanjena. Dakle, poremećaj je došlo opet na kemijske ravnoteže. Smanjena kada iona H , sustav nastojao zamijeniti ono što je uklonjen (proizvodnju kromat, žuta) i povratka u ravnotežu. Isto se događa kada se preselio temperature i tlaka, naime, sustav izgleda za neutraliziranje održiv poremećaja. To takvo ponašanje još jedan vrlo zanimljiv eksperiment? Mjesto na suhom epruveti, nekoliko kristali olovo nitrata Pb (NO Toplo se proizvoditi plin crvenkasto-smeđe (topline, zadržati epruvete naginjati i dirljivo). Nemojte sisati plin. Brzo zatvoriti cijev s čepom. U staklenu posudu, stavite hladne vode s ledom i, u drugoj posudi, stavite tople vode. Uronite cijev test u posudu s ledenom vodom (oprezno). Pričekajte nekoliko minuta i promatrati. Napomena. Sada uroniti cijev test u posudu s hladnom vodom. Pričekajte nekoliko minuta i promatrati. Napomena. Kemijska reakcija koja se dogodila u eksperimentu mogu zastupati: bezbojno crvenkasto-smeđe Što je plin proizveden kada grije test tube? Što se dogodilo kad ste stavili epruvetu u suradnji s PO s ledenom vodom? Kada povećati temperaturu opet, tu je još jedan pomak u ravnoteži sustava koji sada ima više NO i manje N Kao što su pokazali tu promjenu? Možda ste primijetili da se često bocu pjenušavog mineralne vode nije zaboravila u zamrzivaču cura. Ali kad smo otvorili ga rafala. Zašto?