5.2 PRE-LAB ASSIGNMENT 1. Read th e experiment and understand its objectives. Ch

Question

5.2 PRE-LAB ASSIGNMENT 1. Read th e experiment and understand its objectives. Check your lab schedule to help you prepare for the correct parts of Experiment 5. 2. Read the 3. Prepare tables in your notebook for your observations as outlined in Section 5.3. appropriate sections of your textbook, including Chapter 4 of the CHEM 115 workbook. Your lab notebook will be cbecked at the boginning of'tbe lab period.Being unprepared for the lab m tbat you will be asked to leave the lab and woill reccive a mark of "0'for the ex 5.3 EXPERIMENTAL PROCEDURES Ihere are four parts to this experiment. You will only complete tbree of the four procedures. Please che schedule to determine which three procedures you will complete this ter Make sure you record all of your observations for each of the following procedures in your notebook, us ing the table on the following page as a guideline. Part A: Qualitative Observation of Le Châtelier's Principle The equilibrium to be examined in this section is: Fe +SCN Fe(SCN ferric ion thiocyanate ion monothiocyanate iron(III) ion Prepare a solution of Fe(SCNby mixing 5 mL of 0.01 M FeC, solution, 5 mL of 0.01 M KSCN solution, and 10 mL of distilled H,O in an Erlenmeyer flask. Put 20 drops of this solution in each of four small test tubes. The liquid will be about 2 cm deep in each test tube. 1. 2. a. To tube 1 add 10 drops of H,O and use this tube as a "blank against which the other tests may be compared. This tube shows the effect of dilution only, as opposed to equilibrium shifts that may be observed in the others. To tube 2 add 10 drops of Fe(NO), solution. To tube 3 add 10 drops of AgNO, solution. (AgSCN is insoluble in H,O.) Totube 4 add 10drops ofsodium tartrate, NC,HOesolution. (The tartrate ion,C,H a stable complex with Fe".) b. c. d. forms

Explanation / Answer

1. Ag+(aq)+ Cl-(aq)---> AgCl(s)

2. the precipitate dissolved due to tothe formation of the [Ag(NH3)2]+ complex

3.theHNO3 as the H+ of the acid protonated the NH3 and formed NH4+ thus the Ag+ ions reprecipitated to form AgCl(s)

Part C cannot be answered without observations/observation table of color changes

Related Questions

Navigate

• Browse (All)
• Browse 5
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.