Chemistry · Colligative properties of dilute solutions: a relative lowering of vapour pressure, depression of freezing point, the elevation of boiling point and osmotic pressure
Solutions and are respectively glucose, and Which one of the following pairs is
Solutions \( A, B, C \) and \( D \) are respectively \( 0.1 M \) glucose, \( \mathbf{0 . 0 5} M N a C l, 0.05 M B a C l_{2} \) and \( 0.1 M A l C l_{3} . \) Which one of the following pairs is isotonic?
- A. \( A \) and \( B \)
- B. \( B \) and \( C \)
- C. \( A \) and \( D \)
- D. \( A \) and \( C \)
Step-by-step solution
Isotonic solutions have equal osmotic pressure. For non-electrolyte glucose (A), i=1, so iM=0.1. For NaCl (B), i≈2, so iM=2×0.05=0.1. Thus both have same osmotic pressure. Other pairs have different iM values.
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