'x' g of NaCl is added to water in a beaker with a lid. The temperature of the system is raised from 1°C to 25°C. Which…
Solutions · Class 12 · JEE Main Previous Year Question
'x' g of NaCl is added to water in a beaker with a lid. The temperature of the system is raised from 1°C to 25°C. Which out of the following plots is best suited for the change in the molarity (M) of the solution with respect to temperature? [Consider the solubility of NaCl remains unchanged over the temperature range]
- a
Graph (a): M decreases then increases (U-shape)
- b✓
Graph (b): M increases to a maximum (~4°C) then decreases
- c
Graph (c): M increases linearly
- d
Graph (d): M decreases linearly
Graph (b): M increases to a maximum (~4°C) then decreases
Strategy:\n> Molarity () depends on the volume of the solution. If the mass of solute is constant, . Relate solution volume to water's density behavior ( to ).\n\nStep 1: Volume changes of water\n- : Density increases Volume decreases.\n- : Density decreases Volume increases.\n\nStep 2: Resulting Molarity\n- : Volume .\n- : Volume .\nMolarity peaks at .\n\n
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