Question

EQUL 404: Studying Chemical Equilibris and Applying Le Chateliers Pricipale Using Microscale Lechnique Post-Laboratory Questions (Use the spaces provided for the answers and additional paper if necessary.) 1. Experience teaches us that most solids are more soluble in warm water than in cold water. Does the sol ubility of Mg(OH), fit this pattern? Briefly explain (2) The student draws some of the blue solution into the bulb ola Beral pipet. The pipet is placed, bulb down, in a hot-water bath. After a short time, the solu- tion changes from blue to green. Is the forward reaction in Equation 18 endothermic or exothermic? Briefly explain 2. Cobalt chloride is used in many weather forecasting devices. Based on your observations in the laboratory explain how an alcohol solution of CoCl, could be used to predict rain. 4. A student is studying the equilibrium described by Equation 19. heat +COSO 7 H2O(s. pink) + 7 SOCIO COSO,(s, blue) + 7 SO2(g) + 14 HCl(g) (Eq. 19) Using microscale techniques and working in a fume hood, the student mixes pink Coso, - 7 H2O with SOCI, and heats the mixture in a covered container. The solid turns blue. The student removes the cover from the container and stirs the blue solid. After replac- ing the cover, the student cools the mixture, but ob- serves no color change. Briefly explain the basis for the student's observations 3. A student is studying the equilibrium described by the net ionic equation shown in Equation 18. [Cu(H2O)12(aq, blue) + 4 Br "(aq) CuBraq, green) + 6H2O(l) (Eq. 18) (1) The student adds sodium bromide solution (NaBr) to a sample of the blue equilibrium mixture in or- der to increase the Brion concentration. Predict what the student will observe, and explain your prediction.

Answer 1

② Experience teaches us that most slids con mooh alable in magnesiten hyhornde fit this paterns Briefly explan. Answer: - Magnesium hy drrid i ng cott/23 is the in 319ane corsand I can in noul as them bructe ir 13 white Show So Sic in war. It is common component of antacid , seachas of masrosia, oy wzos os lo tiekas در حالی » ، می گوید: اماندا لهم it disselles des it release head then that is the case, the selectility reaction can be theugh on as on creilbriun. as belas : ng conda r g i + 20n-cay) That For any compound that diss lead otheomally increasing the temperature of the labion (adding heart will make the Comprcent leurs soleable (2) how an alahol sollection of cocle cockrbes ard to predict vain ? Angular: Anhydrous cobalt (1) chloed isolere It readily absorbs water from the air and yts hydrated to cobalt (u) chloride herodytate. The hydrater in pink in colour when the water vafoor in the air is almost saturato Clike when ron is imminent), the there coul aborse the weather and the ere&tium thifte to the right to coor changes to pink cachy a sto1.2614 --1-26gt; cach 6H₂O so change in color from there to pint wheeld be a Sign that rain is on the way.

10 Cault olej 2 lag bereds 4hr (ay! - ang genitale) 1 the student atis sodiens brom to a sange of the lue eu 01.11 + inch the Brian Center what the stevent will obrance, cany arrain your Militricem constant remains contant Chura Z A 2:10.14 With quality Nabr bromida cun concentrations in Greece es cari thay to remain koy a constant value for humeratol should incrak color change from theless to green can be directed. 12A) So the han hecatust the sluc section tumed green! forward reason here is ends that mic TI A student is studying the weißbrium described by Cavalion 19 Heat to sou 7110 (S. ponia? tz schleho Casoy (soluelt 752(g) +14 ffeil ) using hiring im axterns microscale techniques and hood, the usant mikes Bina cofoy. 7to with sale and heats then miztur in collend container, the sold turns tuss The student remolds the collas from the contained and stirs the blue gold. After repleting the calls the stond. cools the mixture feel otserlled to color change briefly prin the basis on the student's Diferli hay Aba! Since the geneed the Caloner) the gates excepted! to the atmosphere when he cand the container there is only Casoy left those fore , since there is not to facilitate the reaction, there is no reaction 2019/11/05 23:46 at all