what is the molarity if 0.5 grams of sodium chloride is dissolved to make 0.05 mL of solution?
To determine the molarity of a solution, you need to know the amount of solute (in moles) and the volume of the solution (in liters).
Step 1: Convert the mass of sodium chloride (NaCl) from grams to moles.
To do this, you need to know the molar mass of NaCl, which is the sum of the atomic masses of sodium (Na) and chlorine (Cl). The atomic masses of Na and Cl are 22.99 g/mol and 35.45 g/mol, respectively. Therefore, the molar mass of NaCl is 22.99 g/mol + 35.45 g/mol = 58.44 g/mol.
To convert grams to moles, divide the mass of NaCl by its molar mass:
0.5 g NaCl ÷ 58.44 g/mol = 0.00856 mol NaCl
Step 2: Convert the volume of the solution from milliliters to liters.
To convert mL to L, divide the volume by 1000:
0.05 mL ÷ 1000 = 0.00005 L
Step 3: Calculate the molarity (M) using the formula:
Molarity = moles of solute / volume of solution (in liters)
Molarity = 0.00856 mol / 0.00005 L = 171.2 M
Therefore, the molarity of the sodium chloride solution is 171.2 M.