The solubility of NaCH 3 CO 2 in water is ~1.23 g/mL. What would be the best met
ID: 944665 • Letter: T
Question
The solubility of NaCH3CO2 in water is ~1.23 g/mL. What would be the best method for preparing a supersaturated NaCH3CO2 solution?
add 130 g of NaCH3CO2 to 100 mL of H2O at 80 °C while stirring until all the solid dissolves, then let the solution cool to room temperature
add 130 g of NaCH3CO2 to 100 mL of H2O at room temperature while stirring until all the solid dissolves
add 1.23 g of NaCH3CO2 to 200 mL of H2O at 80 °C while stirring until all the solid dissolves, then let the solution cool to room temperature
a)add 130 g of NaCH3CO2 to 100 mL of H2O at 80 °C while stirring until all the solid dissolves, then let the solution cool to room temperature
b)add 130 g of NaCH3CO2 to 100 mL of H2O at room temperature while stirring until all the solid dissolves
c)add 1.23 g of NaCH3CO2 to 200 mL of H2O at 80 °C while stirring until all the solid dissolves, then let the solution cool to room temperature
Explanation / Answer
given
solubility = 1.23 g/ ml
and
volume = 100 ml
so
for saturation
mass = solubility x volume
mass = 1.23 x 100
mass = 123
so
123 g is saturation
but
supersaturation is required
so
the mass should be more than 123 g
so
the answer is
a)
add 130 g of NaCH3CO2 to 100 mL of H2O at 80 °C while stirring until all the solid dissolves, then let the solution cool to room temperature