Analytical Chemistry:- Analyzing Solids

This is an MCQ-based quiz for GRE on the topic of Analyzing Solids.

Solids analyses are important in the control of biological and physical wastewater treatment processes and for assessing compliance with regulatory agency limitations.

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Determining the molecular ion peak (parent peak) in mass spectroscopy allows you to determine what characteristic of a mystery molecule?

Molecular charge Nuclear charge Molecular weight Functional groups

Calculate the molar solubility of (Co(OH)2) with Ksp=1.3×10^−15 if enough NaOH is added to raise the pH of the solution to pH 12.

2.3*10^-3 M

3.1*10^-3 M

0.5421 M

1.3*10^-13 M

4.11 M

Pb(OH)2 has a Ksp equal to 1.2×10^−15. What would be the numerical expression used to determine the molar solubility (S) of Pb(OH)2 ?

(4.0×10^−16)^1/3

(1.2×10^−15)^1/2

(6.0×10^−16)^1/3

(4.0×10^−16)^1/2

Calculate the molar solubility of Mn(OH)2 with a Ksp=1.6×10^−13 if enough NaOH is added to raise the pH of the solution to pH 10.

1.2*10^-7 M

1.6*10^-9 M

7.9*10^-3 M

0.1992 M

3.2 M

Calculate the molar solubility of PbF2 with Ksp=3.6×10^−8 in a solution containing 0.01 NaF.

1.0*10^-2 M

5.8*10^-4 M

3.6*10^-6 M

5.1*10^-8 M

2.1*10^-3 M

Calculate the molar solubility of PbF2 with Ksp=3.6×10^−8 in a solution containing 0.1M Pb(NO3)2 .

2.0*10^-3 M

3.1*10^-7 M

4.2*10^-4 M

1.2*10^-2 M

0.111

For the titration of 0.001M Ag2+ with 0.150L solution of Cl-(Aq), the end point occurs upon addition of 0.200L of Ag2+ the solution. Determine the initial concentration of chloride that was present in the original solution.

0.0026 M

0.063 M

1.321 M

0.0013 M

How many moles of fluoride ions are present in 1L of a completely saturated solution of lead (II) fluoride?
PbF2(s)→Pb2+(aq)+2F−(aq)

Ksp=3.7∗10^−8

2.1∗10^−3 mol

4.2∗10^−3 mol

1.5∗10^−7 mol

8.4∗10^−3 mol

7.4∗10^−8 mol

Calculate the molar solubility of Co(OH)2 which has a Ksp=1.3×10^−15.

6.36*10^-6 M