Final answer:
To make a 100 ml 3M solution of NaCl, you would need to weigh out 150 g of NaCl and add it to 2850 g of water, taking into account that the volume will slightly increase due to hydrated ions.
Step-by-step explanation:
To make 100 ml of a 3M solution of NaCl, you would need to weigh out 150 g of NaCl and add it to 2850 g of water. It is important to subtract the mass of NaCl from the mass of the solution to calculate the mass of water needed. Keep in mind that when the solute dissolves, the volume of the solution will be slightly greater than 100 ml due to the hydrated ions taking up space.
To make 100 ml of a 3M solution of NaCl, you first need to determine the mass of NaCl required. The molar mass of NaCl is 58.44 g/mol. For a 3M solution, this means 3 moles of NaCl are needed per liter of solution. Therefore, you'd need 3 moles × 58.44 g/mol = 175.32g of NaCl for one liter. Since you only need 100 ml (0.1 L), you'd need 17.532 g of NaCl. When preparing solutions, it's important to consider the final volume after dissolution. You would add the 17.532 g of NaCl to a volumetric flask, start adding water, dissolve the NaCl, and then continue adding water until the 100 ml mark is reached. This ensures the volume of water is accurately measured giving you the desired molarity.