The number of pairs of the solutions having the same value of the osmotic pressure from the following is ______ (Assume $100\%$ ionization)
A. $0.500 \,M \,C _2 H _5 OH$ (aq) and $0.25 \,M\, KBr$ (aq)
B. $0.100 \,M \,K _4\left[ Fe ( CN )_6\right]$ (aq) and $0.100\, M\, FeSO _4\left( NH _4\right)_2 SO _4$ (aq)
C. $0.05\, M \,K _4\left[ Fe ( CN )_6\right]$ (aq) and $0.25\, M\, NaCl ( aq )$
D. $0.15\, M\, NaCl ( aq )$ and $0.1\, M \,BaCl _2$ (aq)
E. $0.02\, M\, KCl MgCl _2 \cdot 6 H _2 O$ (aq) and $0.05\, M\, KCl$ (aq)
A. $0.500 \,M \,C _2 H _5 OH$ (aq) and $0.25 \,M\, KBr$ (aq)
B. $0.100 \,M \,K _4\left[ Fe ( CN )_6\right]$ (aq) and $0.100\, M\, FeSO _4\left( NH _4\right)_2 SO _4$ (aq)
C. $0.05\, M \,K _4\left[ Fe ( CN )_6\right]$ (aq) and $0.25\, M\, NaCl ( aq )$
D. $0.15\, M\, NaCl ( aq )$ and $0.1\, M \,BaCl _2$ (aq)
E. $0.02\, M\, KCl MgCl _2 \cdot 6 H _2 O$ (aq) and $0.05\, M\, KCl$ (aq)
Correct Answer: 4
Solution and Explanation
Osmotic pressure is determined by the ion concentration in solution, considering both the dissociation of solutes and the total number of ions produced. In this case, we analyze each pair based on the number of ions they produce when dissociated in solution. The osmotic pressure is directly proportional to the total concentration of dissolved particles.
Pair A, B, D, and E: These pairs have the same osmotic pressures because they produce the same total number of ions when dissociated, despite possibly differing in the nature of the solute. This results in the same ion concentration and osmotic pressure under identical conditions.
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Concepts Used:
Chemistry in Everyday Life
The scientific study of matter’s properties and behaviour is known as chemistry. It is a natural science that studies the elements that makeup matter, as well as the compounds, made up of atoms, molecules, and ions: their composition, structure, qualities, and behaviour, as well as the changes that occur when they mix with other things.
- Importance of Chemistry in Food - Chemicals are the fundamental components of everything. Chemical molecules make up all food, including carbs, vitamins, lipids, proteins, and fibre, which are all safe and often desirable.
- Importance of Chemistry in Medicines - Medicines or pharmaceuticals are chemical substances that are used to treat diseases and relieve pain. Chemistry has made significant contributions to health care. Chemistry, for example, aids in the manufacture and application of surgical materials.
- Importance of Chemistry in Cosmetics - In our daily lives, we use lotions, fragrances, talcum powder, and a variety of other cosmetic goods. All of these items are developed in laboratories using chemicals for our health and skin.
- Importance of Chemistry in Soaps and Detergents - Soaps are sodium and potassium salts of fatty acids with greater molecular weights, such as stearic acid, palmitic acid, and oleic acid. Sodium salts of long-chain alkyl hydrogen sulphates or sodium salts of long-chain alkyl benzene sulphonic acids are commonly used as detergents.