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Outline the procedure you would use to prepare a standard solution of sodium hydrogen carbonate from solid sodium hydrogen carbonate - HSC - SSCE Chemistry - Question 16 - 2004 - Paper 1
Question 16
Outline the procedure you would use to prepare a standard solution of sodium hydrogen carbonate from solid sodium hydrogen carbonate. Calculate the mass of solid so... show full transcript
Worked Solution & Example Answer:Outline the procedure you would use to prepare a standard solution of sodium hydrogen carbonate from solid sodium hydrogen carbonate - HSC - SSCE Chemistry - Question 16 - 2004 - Paper 1
Step 1
Outline the procedure you would use to prepare a standard solution of sodium hydrogen carbonate from solid sodium hydrogen carbonate.
Answer
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Gather Materials: Collect solid sodium hydrogen carbonate, a balance, a volumetric flask (250 mL), and a glass stirring rod.
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Weigh the Solid: Accurately weigh the amount of solid sodium hydrogen carbonate needed using the balance. Dissolve in distilled water to create a concentrated solution.
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Dissolve and Dilute: Transfer the dissolved solution to a 250 mL volumetric flask and add distilled water until the bottom of the meniscus reaches the 250 mL mark. Cap the flask and mix thoroughly.
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Label: Finally, label the solution with the concentration and date of preparation.
Step 2
Calculate the mass of solid sodium hydrogen carbonate required to make 250 mL of 0.12 mol L⁻¹ solution.
Answer
To calculate the mass, use the formula:
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Convert volume to liters: 250 mL = 0.250 L.
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Molar mass of sodium hydrogen carbonate: Approximately 84 g/mol.
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Calculate mass:
Thus, you would require approximately 2.52 grams of solid sodium hydrogen carbonate.