Inorganic Chemistry Answers

6. A standard CaCO3 solution is prepared by dissolving 0.4193g in enough dilute HCl to effect solution and then diluted to 500ml solution. A 25.00ml aliquot requires 23.62ml EDTA solution for titration. A 25.00ml water sample determined for total hardness, requires 8.45ml of the EDTA solution using Eirochrome Black T indicator. Calculate the total hardness in the water sample expressed in ppm CaCO3. * *

) A buffer was prepared by mixing 1.00 mole of ammonia and 1.00 mole of ammonium chloride to form an aqueous solution with a total volume of 1.00 litre. To 500 mL of this solution was added 30.0 mL of 1.00 M NaOH. What will be the change in pH of this solution?

The isoelectronic [Pd(CO)4] 2+ complex mentioned in the last column of the paper has a significantly

higher CO IR stretching frequency (2248 cm−1 ) compared to [Rh(CO)4]+(2138 cm−1). Is this expected or not? Discuss and compare the two complexes.

The average Rh-CO bond distance in [(n6 C6H6)Rh(CO)2]+

is 1.88 Å, while [Rh(CO)4]+ has an average

Rh-CO bond distance of 1.95 Å. Is the longer Rh-CO distance in [Rh(CO)4]+ consistent with what the IR

stretching frequencies are telling you? Discuss.

Sketch out and electron count the following complexes: [(n6-C6H6)Rh(CO)2]+ and [Rh(CO)4]+

If I have an aqueous solution of H2O2 and the density is 1,11g/mL. Would the density of H2O2 be 0,11g/mL? If not, what would the density be?

Given that the mean relative atomic mass of chlorine prepared in the laboratory is 35.5 and assuming that chlorine contains two isotopes of mass no 35 and 37, what is the % age composition of the isotope of mass no of 37?

Suppose 735 mg of quercetin in 100 mL water were extracted with an equal volume of isopropyl ether. The layers were separated and the ether was evaporated. The residue was found to contain 585 mg of quercetin. What is the distribution constant K?

Suppose 735 mg of quercetin in 100 mL water were extracted with an equal volume of isopropyl ether. The layers were separated and the ether was evaporated. The residue was found to contain 585 mg of quercetin. What is the distribution constant K?

Solid ammonium chloride undergoes sublimation on heating. In the vapour phase ammonium 

chloride decomposes to give NH3(g) and HCI(g). The following equilibrium is established. 

 NH4Cl(s) ⇌ NH3(g)+ HCl (g)

 What is the number of 

i) phases in the system, 

ii) components in the system, and 

 iii) degrees of freedom of the system?