Physical Pharmacy
???????? Buffers and pH????????
1️⃣ Which of the following relationship is true for an acidic solution at 25°C?
A. [H+] > [OH-]
B. pH > 7.00
C. Kw > 1×(10)^-14
D. The solution is negatively-charged
2️⃣ An aqua solution containing a concentration of 2.5×10^-8 (OH-) ion will have a pH of which of the following?
A. 6.4
B. 6.40
C. 7.40
D. 7.60
3️⃣ A Buffer solution comprises which of the following?
A. A Weak acid in solution
B. A strong acid in solution
C. A weak base in solution
D. A weak acid and its conjugate base in solution
4). A Buffer solution contains 0.36 M sodium acetate (CH3 COONA) And 0.45 M acetic acid (CH3 COOH), pKa=4.8 .what is the pH of this buffer solution?
A. 4.7
B. 5.2
C. 3.8
D. 6.1
5). The concept of pH was introduced by
A. Arrhenius
B. Bronsted
C. Sorensen
D. Lewis
6️⃣ Which of the following type of electrode used in pH metre?
A. Hydrogen electrode
B. Quinhydrone electrode
C. Calomel electrode
D. All of the above
7️⃣ The term ‘Buffer Capacity’ first introduced by.
A. Van Slyke
B. Sorensen
C. Bronsted
D. Arrhenius
8️⃣ Buffer contains acetic acid – sodium acetate having pH range __________ used in the Pharmaceutical formulations.
A. 1.2 to 6.6
B. 5.0 to 8.0
C. 3.8 to 5.6
D. 7.8 to 10.6
9️⃣ pH of tears has the value of
A. 1.2
B. 6.8
C. 5.5
D. 7.4
???? The phenomenon of bursting of RBCs due to increased uptake of water is called
A. Osmotic lysis
B. Hydrolysis
C. Osmosis
D. Isotonicity
Answers
1. A([H+] > [OH-]
2. A(6.4)
3. D(A week acid and its conjugate base in the solution)
4. A(4.7)
5. C(Sorensen)
6. D(All of the above)
7. A(Van slyke)
8. C(3.8 to 5.6)
9. D(7.4)
10. A(Osmotic lysis)
