IGNOU MSCANCHEM MCH 1 SOLVED ASSIGNMENT

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MCH 1 2025 - English

Tutor Marked Assignment

MCH-001: Basic Analytical Chemistry

Course Code: MCH-001

Assignment Code: MCH-001/TMA/2025

Maximum Marks: 100

Note: Answer all the questions given below.

1 a) Explain Coulometric analysis and Potentiometric analysis.

b) What are the three major contributions in the present vitality of analytical chemistry? How it has helped in saving time?

2 a) What are indeterminate errors? How can they be prevented?

b) Three quantities are to be summed up as y = a+b-c. The individual absolute standard deviations of the three quantities are given in parentheses: a=50.23(+0.07), b=27.86 (+0.05) and c=0.1167(+0003). Calculate the standard deviation of the arithmetic operation and express with absolute uncertainty.

3 a) What are Grab or catch samples? How is it different from integrated samples?

b) Why is it essential to consider the safety aspect at the time of the construction of the laboratory building? List any three requirements that must be met as per the norms in a chemical laboratory.

4  a) Give the classification of the sampling methods for gaseous pollutants. In this context, when absorption is done in liquids then what is the collection efficiency?

b) What sort of first aid should be provided after chemicals are accidentally ingested in the laboratory?

5. a) What is the proportional equation method for measurement of reaction rates?

b) Write the chemical equations for the leveling of HCIO₄, HCI and HNO₃ in methanol. Also give the steps in which phosphoric acid dissociates.

6 a) What is indicator error? How the indicator should be selected for a given titration?

b) Calculate the pH of a solution prepared by adding 25 cm³ of 0.20 M NaOH to 30 cm³ of 0.40 M acetic acid.

7 a) Calculate the redox potential of Sn⁴⁺, Sn²⁺ system, if the Sn⁴⁺ ion concentration is 1 g ion/dm³ and the Sa²⁺ ion concentration is 0.001 g ion/dm³.

b) What are the factors that affect stability of metal-ligand complexes? Elaborate on any two of them.

8 a) What are the key steps in designing a typical complexometric determination? How are they advantageous over precipitation titrations?

b) Lead-EDTA chelate having the formula PbY^2- has a formation constant of 1.1X10¹⁴. Compute the conditional formation constants at a pH = 10. (value of ay^4- at pH of 10 is 0.36).

9 a) Give the curve for precipitation titration of Br' with Ag⁺. Explain it.

b) Explain supersaturation and nucleation in context with gravimetric analysis.

10 a) Briefly describe the role of computers in analytical instrumentation.

b) What is inductively coupled plasma (ICP)? What are the two types of ICP instruments? Can you determine all elements by ICP?

MCH 001 (January 2026) - ENGLISH

TUTOR MARKED ASSIGNMENT

BASIC ANALYTICAL CHEMISTRY

Course Code: MCH-001

Assignment Code: MCH-001/TMA/2026

Maximum Marks: 100

Note: Answer all the questions given below.

1.

a) What are optical methods of analysis? List different optical methods of analysis and explain the principle of fluorophotometry. 

b) Discuss different means of minimizing errors and improving the accuracy of an analytical determination. 

2.

a) The precision of a population of data is indicated in terms of standard deviation. Explain the meaning of standard deviation and illustrate the same with the help of an example. 

b) What is meant by confidence level of an analytical data? The measurements of glucose levels in a patient suffering from diabetes gave the following results: 1.108, 1.100, 1.122, 1.088, 1.115, 1.099 and 1.075 g/L. Calculate the 95% confidence interval for the set; you may assume the value of Cn to be = 0.4 

3. a) Why do we need to reject some data? Explain the ‘4d’ rule for the rejection of a data. 

b) What is meant by a ‘sample’ for analytical determination? Discuss the sampling of food materials. 

4.

a) Why is it essential to consider the safety aspect at the time of the construction of the laboratory building? List any three requirements that must be met as per the norms in a chemical laboratory. 

b) What is meant by incompatibility of chemicals? List different methods of storage of chemicals and state the recommendations for the safe storage of chemicals in a laboratory. 

5.

a) A reactant A gives a product P in a first order irreversible reaction. Derive an integrated rate equation for the reaction. Calculate the time required for 90 % conversion of A to P if the time for 50% conversion is 30 s. 

b) What is meant by the leveling effect of a solvent? Explain with the help of a suitable example. 

6.

a) Which is more basic; 0.10 M NaOCl or 0.001M KOH. Justify your answer with calculations. 

b) What is meant by buffer capacity? Calculate the buffer capacity of a solution, which is 0.10 M in formic acid and 0.10 M in sodium formate. (pKa of acetic acid = 3.74). 

7. a) What are indicators? Discuss the Ostwald’s theory of acid base indicators and derive an expression relating the pH and the concentration of two forms of the indicator. 

b) Discuss the role of non-aqueous solvents in acid base titrations. 

8. a) Calculate the equilibrium constant of the following reaction and predict the direction of the reaction. 

Ni (s) + 2Ag+ (aq.) ⇌ Ni²+ (aq.) + Ag(s)

Given: E°_Ni²⁺/Ni = -0.25 and E°_Ag⁺/Ag = 0.80

b) What are oxidimetric reagents? Illustrate the use of potassium bromate as an oxidimetric reagent with the help of a suitable example. 

9.

a) Differentiate between stepwise formation constants and overall formation constants for the formation of a complex with the help of an example. 

b) What is Mohr titration? Explain the principle of Mohr’s titration explaining the equilibria involved in end point determination. 

10.

a) Organic reagents play an important role in gravimetric analysis. Describe the different types of reactions involved in such determinations. 

b) Give a brief account of the role of computers in analytical instrumentation. 

 

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