The premise of the experiment you will be performing is that you can measure the solubility of a salt from observations of the mass of a sample before and after creating a saturated solution with it. Answer the following in terms of the mass of the beaker used to hold the sample, mbeaker, the mass of the salt before creating the saturated solution, msalt, before, the mass of the undissolved salt left over after creating the solution, msalt, after, the molar mass of the salt, Msalt, and the volume of water used to create the solution, VH2O.
The premise of the experiment you will be performing is that you can measure the solubility of a salt from observations of the mass of a sample before and after creating a saturated solution with it. Answer the following in terms of the mass of the beaker used to hold the sample, mbeaker, the mass of the salt before creating the saturated solution, msalt, before, the mass of the undissolved salt left over after creating the solution, msalt, after, the molar mass of the salt, Msalt, and the volume of water used to create the solution, VH2O.
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(a) Write an expression for the mass you will observe when placing the salt in the beaker on a balance before creating the saturated solution, m1.
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(b) After creating the saturated solution in the beaker, the liquid is decanted to leave the undissolved salt settled at the bottom of the beaker. Write an expression for the mass you observe when placing the beaker on the balance at this point, m2.
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(c) Write an expression for the mass of the salt that was dissolved in the saturated solution before it was decanted in terms of m1 and m2.
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(d) Using your expression from part (c), write an expression for the molar concentration of the salt dissolved in the saturated solution - the molar solubility!
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(e) If some of the salt was accidentally decanted with the saturated solution, which of your expressions from parts (a) - (c) would be affected? Would the resulting molar solubility be too high, too low, or the same as before?
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(f) If not all of the saturated solution was decanted before measuring the mass of the remaining undissolved salt, which of your expressions from parts (a) - (c) would be affected? Would the resulting molar solubility be too high, too low, or the same as before?
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