How much 40% Nacl (Fw 58.44) would you need to make 2.5L of a 5% Nacl solution?
To determine how much 40% NaCl solution you would need to make a 5% NaCl solution, you can follow these steps:
Step 1: Convert the given volume to liters.
2.5 L
Step 2: Determine the desired concentration of NaCl in the solution.
5%
Step 3: Calculate the amount of NaCl needed in the final solution (in grams).
2.5 L * 0.05 = 0.125 mol NaCl (since molarity = mol/L)
0.125 mol * 58.44 g/mol = 7.305 g NaCl
Step 4: Calculate the amount of 40% NaCl solution needed to supply the required amount of NaCl.
Let's assume the 40% NaCl solution contains 40 g NaCl per 100 mL of solution.
First, calculate the amount of NaCl in the desired solution (in grams).
7.305 g NaCl
Then, calculate the volume of the 40% NaCl solution needed to supply this amount of NaCl.
40 g NaCl / 100 mL = 7.305 g NaCl / x mL (using a proportion)
x = (7.305 g NaCl * 100 mL) / 40 g NaCl = 18.2625 mL NaCl
So, you would need approximately 18.2625 mL of 40% NaCl solution to make 2.5 L of a 5% NaCl solution.