The solubility of NaCH 3 CO 2 in water is ~1.23 g/mL. What would be the best met

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

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

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

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