Adding one gram of NaCl to one liter of water will lower the water concentration twice as much as adding one gram of glucose.

Question

Quizplus · Accepted Answer

NaCl dissociates into two ions (Na+ and Cl-) when dissolved in water, effectively doubling the number of particles in solution compared to glucose, which does not dissociate. This increases the solute concentration more significantly with NaCl, affecting properties like osmotic pressure and freezing point depression more than glucose would, but it does not "lower the water concentration" in the manner suggested by the question. The concept of "lowering water concentration" is more accurately described in terms of increasing solute concentration, which affects the solution's properties differently than simply halving the water concentration.

Adding One Gram of NaCl to One Liter of Water