Question

Calculate the volume in milliliters of a 1.72 mol/L sodium thiosulfate solution that contains 375. mmol of sodium thiosulfate (Na_2S_2O_3).

Answer 1

Answer:

216 mL

Explanation:

Molarity of a substance , is the number of moles present in a liter of solution .

M = n / V

M = molarity  ( unit = mol / L or M )

V = volume of solution in liter ( unit = L ),

n = moles of solute ( unit = mol ),

From the question , the respective values are as follows  -

M = 1.73 mol / L

n = 375 mmol

Since,

1 mmol = 0.001 mol

n = 375 * 0.001 mol = 0.375 mol

Now , the volume of can be calculated by using the above equation ,

M = n / V  

Putting the respective values ,

1.73 mol / L = 0.375 mol / V

V = 0.216 L

Since,

1 L = 1000 mL

V = 0.216 * 1000 mL = 216 mL