Question

To make a .5 M solution fo NaCl, you would do which of the following

a.) weigh out 29.3 g of NaCl and dissolve in exactly 1 L of water
b.) weigh out 29.3 g of NaCl and dissolve in water to give exactly 1 L of solution
c.) weigh out 29.3 g of NaCl and dissolve in exactly .5 : pf water
d.) weigh out 29.3 g of NaCl and dissolve in water to give exactly .5 L of solution"

Answer 1

To make a 0.5 M solution of NaCl, you would weigh out 29.3 g of NaCl and dissolve it in exactly 1 L of water.

Step-by-step explanation:

To make a 0.5 M solution of NaCl, you would weigh out 29.3 g of NaCl and dissolve it in exactly 1 L of water. Option a) is the correct answer. This is because a 0.5 M solution means there is 0.5 moles of NaCl dissolved in 1 liter of water. To determine the mass of NaCl needed, we use the formula:

Mass (g) = Molarity (mol/L) * Volume (L) * Molar Mass (g/mol)

In this case, the molarity is 0.5 M, the volume is 1 L, and the molar mass of NaCl is 58.44 g/mol. Plugging in these values, we get:

Mass (g) = 0.5 mol/L * 1 L * 58.44 g/mol = 29.22 g ≈ 29.3 g