Question

Pre-Laboratory Assignment 1. Briefly describe the hazards associated with us ing the following (1) concentrated NH, solution 3. We can prepare the yellow coordination compound potassium tris(oxalato rhodate(lll), KIRh(,0)), by reacting potassiumn hexachlororhodatelli), KIRCI. and potassium oxalate, K 0,04 (1) Balance the chemical equation for this reac- tion, shown below. K(RhCi (aq) + K C20 (aq) → K[Rh(C2O4)3 (s. yellow) + KCl(aq) (2) If we combine 1 mol of KIRhClel with 1 mol of K C204, which compound is the limiting reagent? (2) ethanol 2. Define the following terms as they pertain to this experiment. (1) complex iond (3) How many moles of KIRh(0,0)) could form from the reaction in (2)? (2) ligand (3) limiting reagent 4. A student, using the reaction in 3.(1), combined 1.00 g of K (RhClel with 25.0 mL of 1.25M K,C,0 and isolated 0.96 g of KIRh(C204)31 (1) Calculate the number of moles of KIRhCigl the student used. UUUUUUUUUU (4) theoretical yield (2) Calculate the number of moles of K C20the student used. (5) percent yield

Answer 1

1. a) Conc. NH3 solution: Conc- NH3 solection is highly corrosive. It can cause turn to skin and also causes nausea, vomiting, headache when directly inhaled. 6) Ethand should be used carefully because of its low boiling point and high vapour pressure it is highly inflammable and catch sudden fire. 2. D A in which retain its identity in selection and does not dissociate is called complex ion. fg: [Cu(NH3)4] 27 ii) Ligond: Negatively charged or neutral molecule which contain at least one love hair of ē which can be donated to metal ion is called ligand Eg NH3, H₂o etc. ii) Limiting Reagent is the reagent which is prexst is less amount and decides the overall yield of the reaction W Theoretical yield is the amount one should get theoretically is facher. It is based on mole concept. u to gield is defined as the ratio of observed yield to that of theoretical yield. d. yield = observed yield xloo. Theoretical yield