Arrange the following three water solutions according to decreasing osmotic pressure

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To arrange the three water solutions according to decreasing osmotic pressure, we need to understand the concept of osmotic pressure and how it relates to solute concentration.

Osmotic pressure is the pressure required to prevent the passage of solvent molecules through a semipermeable membrane from a region of lower solute concentration to a region of higher solute concentration. It depends on the concentration of solute particles in a solution.

Here are the three water solutions:

Solution A: 1 M NaCl
Solution B: 0.5 M glucose
Solution C: 2 M sucrose

Comparing the three solutions, we can determine their osmotic pressure based on the concentration of solute particles. In general, a higher concentration of solute particles will result in a higher osmotic pressure.

Firstly, let's compare Solution A and Solution B. Since NaCl dissociates into two particles (Na+ and Cl-) in water, a 1 M NaCl solution will have an osmotic pressure higher than that of a 0.5 M glucose solution, which does not dissociate into multiple particles. Therefore, the osmotic pressure of Solution A (1 M NaCl) is higher than Solution B (0.5 M glucose).

Next, let's compare Solution A (1 M NaCl) and Solution C (2 M sucrose). NaCl, as mentioned earlier, dissociates into two particles (Na+ and Cl-). In contrast, sucrose does not dissociate and remains as one particle. Therefore, a 2 M sucrose solution will have a higher concentration of solute particles and thus a higher osmotic pressure compared to a 1 M NaCl solution. Thus, the osmotic pressure of Solution C (2 M sucrose) is higher than Solution A (1 M NaCl).

To summarize, the three water solutions arranged in decreasing osmotic pressure are:

1. Solution C (2 M sucrose)
2. Solution A (1 M NaCl)
3. Solution B (0.5 M glucose)

Remember that osmotic pressure depends on the concentration of solute particles. By comparing the number of particles formed by the solute in each solution, you can determine the relative osmotic pressure.