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Problem: (Mass Percentage)

1. Bicarbonate of soda (sodium hydrogen carbonate) is used in many commercial preparations. Its formula is NaHCO3. Find the mass percentages (mass %) of Na, H, C, and O in sodium hydrogen carbonate.

(Weight/Volume Percentage)

2. What is the weight/volume percentage concentration of 250mL of aqueous sodium chloride solution containing 5g NaCl?

a. Calculate the weight/volume (%) 

3. 10.00g BaCl2 is dissolved in 90.00g of water. The density of the solution is 1.09g/mL. Calculate the weight/volume percentage concentration of the solution.

a. Calculate the volume of the solution

b. Calculate w/v (%)

4. 186.4L of aqueous sodium hydroxide solution contains 1.15kg NaOH. What is the weight/volume percentage concentration of this solution in g/100mL?

 a. Convert the units (mass to grams, volume to mL) mass solute (NaOH)

b. calculate w/v (%)

Exercise : Direct Titration

1. A 0.4020 g sample of pure Na₂C₂O₄ was titrated with 30.55 m L of a solution of NaMnO₄, according to the equation.

 NaMnO₄+NaC₂O₄+H₂S₂O₄ ------> Na₂SO₄=MnSO₄+CO₂+H₂O