HOw much Nacl (MW= 58.44g) would you need to to a solution if you wanted to make 100 ,mL of 4* 10 to the -3 M NaCl?
To determine the amount of NaCl needed, we need to use the equation:
moles = concentration (M) x volume (L)
First, let's convert the given solution volume from milliliters (mL) to liters (L):
100 mL = 100/1000 L
= 0.1 L
Now, rearrange the formula to solve for moles:
moles = concentration (M) x volume (L)
moles = (4 x 10^-3) M x 0.1 L
moles = 4 x 10^-4 moles
Next, we can calculate the mass of NaCl needed using its molar mass (MW):
mass (g) = moles x molar mass (g/mol)
mass (g) = 4 x 10^-4 moles x 58.44 g/mol
mass (g) ≈ 0.023 g
Therefore, you would need approximately 0.023 grams of NaCl to make a 100 mL solution with a concentration of 4 x 10^-3 M NaCl.
To calculate the amount of NaCl needed to make a 4 x 10^-3 M NaCl solution in 100 mL, we will use the formula:
Amount of NaCl (g) = concentration (mol/L) x volume (L) x molecular weight (g/mol)
First, let's convert the given concentration to Moles/Liter (M):
4 x 10^-3 M NaCl = 4 x 10^-3 mol/L
Next, convert the volume to liters:
100 mL = 100/1000 L = 0.1 L
Now we can substitute the values into the formula to find the amount of NaCl needed:
Amount of NaCl (g) = (4 x 10^-3 mol/L) x (0.1 L) x (58.44 g/mol)
Amount of NaCl (g) = 0.004 mol x 0.1 L x 58.44 g/mol
Amount of NaCl (g) = 0.244 g
Therefore, you would need to add approximately 0.244 grams of NaCl to the solution to obtain a 4 x 10^-3 M NaCl concentration in 100 mL.