Inorganic Chemistry Laboratory (CHMS3206)
BSc, Chemistry - CHMS
Semester: Resit
Level: 300
Year: 2017
REPUBLIC OF CAMEROON REPUBLIQUE DU
CAMEROUN
Peace-Work-Fatherland Paix-Travail-Patrie
THE UNIVERSITY OF BAMENDA UNIVERSITE DE BAMENDA
P.O. Box 39 Bambili
Faculty of science Department of chemistry lecturer: Anagho/Nono
Course code: CHMS3206 Course title: Inorganic chemistry laboratory
Date: 25/09/2017 hall: asanji time: 15:00-17:00 (2 hours)
Instructions: Please answer all questions.
1.The first part of the practical of year two chemistry student of UBa is concerned with the preparation and the
analysis of doubles salts and complex salts.
(i)
Define double salts and complex salts. (2 marks)
(ii)
Give in tabular form two (2) differences and two (2) similarities between double salts and complex salts.
Give the name and the chemical formula of a double salt and a complex salt prepared during the practical section.
(4 marks)
2. A student of year two Chemistry prepared a double salt from 520 mg of iron(II) sulfate hexahydrated (molar mass
= 260 g/mol) and 264 mg of ammonium sulfate (molar mass = 132 mg).
(i)
Write the balance chemical equation of the reaction of iron(II) sulfate hexahydrated and ammonium
sulfate. (2 mark)
(ii)
Calculate the theoretical yield of the reaction. _ _________________ (2 marks)
(iii)
Determine the limiting reagent of the reaction. (2 marks)
(iv)
Calculate the percentage yield of the reaction. (1 mark)
(v)
The student carry out a qualitative analysis or a quantitative analysis? Justify your answer.
(2 marks)
3. During practical of year two chemistry, ions were identified using flame test and chemical reagents.
(i)
Briefly explained how a flame test is carry out. (2 marks)
(ii)
Give one advantage and one inconvenient to use the flame test for the identification of ions. List in
tabular form, five ions that can be identified using flame test and the observed colour during the flame test. (5
marks)
(iii)
List two (2) cations and two (2) anions that are identified using precipitation reactions.
Write the balance chemical equation for each of them. (4 marks)
(iv)
List two (2) cations and two (2) anions that are identified using acid-base reactions. Write
the balance chemical equation for each of them. (4 marks)
(v)
List one (1) cations and one (1) anions that are identified using gas forming reactions.
Write the balance chemical equation for each of them. (2 marks)
(vi)
Identification of ion is a qualitative analysis or a quantitative analysis? Justify your answer.
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