Philadelphia University
Faculty of Pharmacy
Lecturers : Dr. Ibrahim Khatib
And Dr. Zaher Algharaibeh
Department of Pharmaceutical Sciences
Student Name:
Course Name: Pharm Anal. Chem.
Course Number: 0510113
First Exam
Student Number:
First Semester: of Academic Year 2014 / 2015
Sections:
Date: 5/4 / 2015
Time: 50 minutes
Information for Candidates
1. This examination paper contains 4 pages and 7 questions, totaling..20… mark.
2. The marks for parts of questions are shown in round brackets.
Notes to Candidates
1. You should attempt all questions.
2. You should write your answers clearly.
1.
2.
Question 1 choose the correct answer
(4 marks)
The definition of the molarity is:
a. The molarity is the number of moles per kilogram solvent.
b. The molarity is the atomic weight expressed in gram.
c. The molarity is the solution that contains one kilogram of solute.
d. The molarity the number of moles per liter solution
A student was asked to make up a 10% w/w solution of sodium carbonate. Which
one of the following methods should have been followed?
a. Dissolve 10 g of the sodium carbonate in water and make up to a mass of 100 grams
by adding more water.
b. Dissolve 10 g of the sodium carbonate in water and make up to a volume of 1litre in
a volumetric flask by adding more water.
c. Dissolve 10 g of the sodium carbonate in water and make up to a volume of 100 cm3
in a volumetric flask by adding more water.
d. Dissolve 10 g of the sodium carbonate in exactly 100 cm3 of water
3. If 10 mL of 0.1M solution HNO3 was diluted to a volume of 50 mL what is the new
concentration of the HNO3solution?
a. 0.0002 M
b. 2 M
c. 0.002 M
d. 0.02 M
4. The system has gone from being ACID, past the equivalent point to the BASIC
(excess base), and back to the equivalent point again. The final titration to the
equivalent point is called.
a. Direct titration
b. Acid base titration
c. back titration
d. a and b
1
Question2
Write four of the requirements for successful volumetric titration.
(2 marks)
1.
2.
3.
4.
Question3
Calculate the mass of the following substances:
a . 25 mL of 0.35 M Na2SO3 solution ( Mw = 142.)
b. 1 milliliter of 0.15 LiCl solution
c.
(1 marks)
(Mw 42.5)
500 ppm (Li (A.w 7)
(1 marks)
(1 mark)
Question4
Calculate the molar concentration of 20.00 ppm solutions K (Mw =39.1)
and CH4 (Mw 16)
(3 marks)
2
Question5
How many milliliters of concentrate HClO4 (110.5) 70% (g/100 gram solution,
density 1.35 g/cm3, are required to prepare 1 liter of 0.100 M solution?
(3 marks)
Question 6
Distinguish between qualitative analysis and quantitative analysis? (2 points)
3
Question7
90.0 mL of 0.2105 M HCl acid was added in excess to 2.000 g calcium carbonate.
( Mw 100)The excess acid was back titrated with 0.1055 M sodium hydroxide. It
required 12.2 mL of the base NaOH to reach the end point.
Calculate the percentage (w/w) of calcium carbonate in the sample.
(3 marks)
2HCl + CaCO3  CaCl2
+ CO2 + H2O ------ 1
HCl + NaOH  NaCl + H2O ------- 2
4