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

Calculate the required amount of solid sodium hydrogen carbonate (NaHCO₃):

• Determine the molar mass of sodium hydrogen carbonate, which is approximately 84.01 g/mol.

• If you're preparing a solution of known molarity and volume, use the formula:

  $n = C imes V$

  where $n$ is the number of moles, $C$ is the concentration in mol/L, and $V$ is the volume in liters.

• For example, for a 0.1 mol/L solution in 1 L, $n = 0.1 imes 1 = 0.1$ moles.

• Calculate the mass:

  $ext{mass} = n imes ext{molar mass}$

  Thus, the mass would be $0.1 imes 84.01 ext{ g} = 8.401 ext{ g}$.

Weigh the solid sodium hydrogen carbonate:

• Use an electronic balance to accurately weigh out the calculated amount of sodium hydrogen carbonate.

Dissolve the solid in distilled water:

• Add the solid to a clean beaker containing distilled water. Stir with a glass rod until completely dissolved.

Transfer to a volumetric flask:

• Pour the solution into a 250 mL volumetric flask, rinsing the beaker with distilled water to ensure all solute transfers into the flask.

Make up to the mark:

• Add distilled water to the volumetric flask until the bottom of the meniscus reaches the 250 mL mark. Stopper the flask and invert it several times to mix thoroughly.