1. How many milliliters of 2.0 M solution can be prepared from 28 grams of NaOH?

Question

1.   How many milliliters of 2.0 M solution can be prepared from 28 grams of NaOH?

2.  If 55.0 grams of NaCl and 250.0 grams of water are added together calculate the percent solution.

   What would be the mole fraction of solute in #2 above?

   What would be the molality of the solution in #2 above?

3   How many grams of water are needed to prepare a 3.0 m solution from 26.0 grams of KBr?

4.  Find the molality of a 15% NaOH solution.

What would be the mole fraction of the solution in #4 above

5.  A 5.0 % solution of acetic acid (HC2H3O2) has a density of 1.05 g/ml .  Calculate the molarity of the solution.

       Find the mole fraction of solute in the solution in #5 above.

      What is the molality of the solution in #5 above?

Explanation / Answer

See More About chemistry problems concentration science calculations chemical solutions Calculating concentration of a chemical solution is a basic skill all students of chemistry must develop early in their studies. What is concentration? Concentration refers to the amount of solute that is dissolved in a solvent. We normally think of a solute as a solid that is added to a solvent (e.g., adding table salt to water), but the solute could just as easily exist in another phase. For example, if we add a small amount of ethanol to water, then the ethanol is the solute and the water is the solvent. If we add a smaller amount of water to a larger amount of ethanol, then the water could be the solute!

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