You need to make a 150mM solution of NaCl (MW = 58).
How much NaCl do you need to make 1L (in moles and in grams)?
If you b need to make 250mL how much NaCl would you need in grams?
Molarity=(mass/molmass) / volume in liters
massNaCl=Molarity*molmass*volumeinliters
To determine the amount of NaCl needed to make a 1L solution, we will use the formula:
Amount (in moles) = concentration (in M) x volume (in L)
Given that the concentration is 150mM (or 0.150M) and the volume is 1L, we can calculate the amount of NaCl needed in moles:
Amount (in moles) = 0.150M x 1L = 0.150 moles
To convert the amount of NaCl needed from moles to grams, we will use the molar mass of NaCl, which is 58 g/mol:
Amount (in grams) = amount (in moles) x molar mass (in g/mol)
Amount (in grams) = 0.150 moles x 58 g/mol = 8.7 grams
Therefore, to make a 1L solution of 150mM NaCl, you would need 0.150 moles or 8.7 grams of NaCl.
If you need to make 250mL of the same solution, we can use the same formula:
Amount (in grams) = concentration (in M) x volume (in L) x molar mass (in g/mol)
Given that the concentration is 150mM (or 0.150M), the volume is 250mL (or 0.250L), and the molar mass is 58 g/mol:
Amount (in grams) = 0.150M x 0.250L x 58 g/mol = 2.175 grams
Therefore, to make a 250mL solution of 150mM NaCl, you would need 2.175 grams of NaCl.
To make a 150mM solution of NaCl, you need to follow the steps below:
Step 1: Calculate the molar mass of NaCl.
The molar mass of NaCl is 58 g/mol.
Step 2: Convert the desired concentration from mM to M.
1 mM = 1/1000 M, so 150 mM = 150/1000 = 0.15 M NaCl.
Step 3: Calculate the number of moles required to make 1L.
1L = 1000mL, so the moles of NaCl required can be calculated using the formula:
moles = concentration (M) * volume (L)
moles = 0.15 M * 1 L
moles = 0.15 moles NaCl.
Step 4: Calculate the grams of NaCl required.
grams = moles * molar mass
grams = 0.15 moles NaCl * 58 g/mol
grams = 8.7 grams NaCl.
So, to make a 1L solution, you would need 0.15 moles (8.7 grams) of NaCl.
If you need to make a 250 mL (0.25 L) solution, you can use the same formula as in step 3:
moles = concentration (M) * volume (L)
moles = 0.15 M * 0.25 L
moles = 0.0375 moles NaCl.
To calculate the grams required, use the formula from step 4:
grams = moles * molar mass
grams = 0.0375 moles NaCl * 58 g/mol
grams = 2.175 grams NaCl.
So, to make a 250 mL solution, you would need 0.0375 moles (2.175 grams) of NaCl.