A chemist prepares a solution of sodium thiosulfate Na2S2O3 by measuring out 100.g of sodium thiosulfate into a 450.mL volumetric flask and filling the flask to the mark with water.Calculate the concentration in /molL of the chemist's sodium thiosulfate solution. Be sure your answer has the correct number of significant digits.
Question
A chemist prepares a solution of sodium thiosulfate Na2S2O3 by measuring out 100.g of sodium thiosulfate into a 450.mL volumetric flask and filling the flask to the mark with water.Calculate the concentration in /molL of the chemist's sodium thiosulfate solution. Be sure your answer has the correct number of significant digits.
Solution
To calculate the concentration of the solution, we need to follow these steps:
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Convert the mass of sodium thiosulfate to moles. The molar mass of Na2S2O3 is approximately 158.11 g/mol. So, the number of moles is given by:
Moles = mass / molar mass Moles = 100 g / 158.11 g/mol = 0.632 moles
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Convert the volume of the solution from mL to L. 1 L = 1000 mL, so:
Volume = 450 mL = 0.450 L
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Calculate the concentration (Molarity) of the solution. Molarity is defined as the number of moles of solute per liter of solution. So:
Molarity = moles / volume Molarity = 0.632 moles / 0.450 L = 1.40 mol/L
So, the concentration of the sodium thiosulfate solution is 1.40 mol/L.
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