College Gen. Chemistry - Science

posted by .

You have 120.0 mL of a 0.245 M solution of NaCl in an open beaker. After several days, you
test the solution and find that it now has a concentration of 0.348 M. How much water must
have evaporated from the beaker given the new concentration?

  • College Gen. Chemistry - Science -

    So how many mols did you have to start? That's mols = M x L = 0.120 x 0.245 = 0.0294.
    When some of the water has evaporated you know you still have 0.0294 mols there. And the molarity now is 0.348M and not 0.245M. So M = mols/L. M = 0.348; mols = 0.0294. Solve for L of solution and subtract from the starting volume to find how much has evaporated.

  • College Gen. Chemistry - Science -

    Dear Dr Bob222,

    Thank you so much! The answer is 35.5 mL on H2O has evaporated.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Chemistry

    Two beakers are placed in a sealed container surrounded with air. In one beaker is pure H2O (Beaker A) and the other beaker is a 10% Sugar solution (Beaker B). As the system approaches equilibrium what change occurs to the volume of …
  2. Chemistry

    25.0 mL of a NaCl solution (concentration unknown) was found to react with 20 drops of the chloride test solution from the PU Chloride Test Kit. Calculate the mass of NaCl (in grams) in this solution. Calculate the mass of NaCl required …
  3. Chemistry

    You have 100.0 mL of 0.2500 M solution of NaCl sitting in a beaker. After several days you test the solution and find out that it is now 0.3721M. How much water must have evaporated?
  4. chemistry

    A student is given 3 beakers: Beaker 1- 50.0 ml of a solution produced by dissolving 6.00 grams of a weak monoprotic acid ,HX, in enough water to produce 1 liter of solution. The empirical formula of HX is CH2O. The solution contains …
  5. Chemistry

    What is the molarity of a solution of Mg(OH)2 if the solution contains 1.35 g in exactly 100 mL of solution?
  6. College Chemistry (DrBob222)

    You have 120.0 mL of a 0.245 M solution of NaCl in an open beaker. After several days, you test the solution and find that it now has a concentration of 0.348 M. How much water must have evaporated from the beaker given the new concentration?
  7. Chemistry

    If there are 0.625 g of NaCl left in a beaker that originally contained 75.0 mL of saltwater, what must have been the molar concentration of the original solution?
  8. chemistry

    100.0 mL of a dilute NaCl(aq) solution is heated in an open beaker. After 15 minutes the burner is turned off. Which of the following is true of the resulting solution?
  9. Scient

    (NaCl) solutions used in intravenous injections have a concentration of 0.90% NaCl (mass/volume). 4.5grams of NaCl are needed to prepare 500.0 mL of this solution How much water must evaporate from this solution to give a solution …
  10. chemistry

    A bottle of commercial hydrochloric acid solution So is labeled 37% composition by mass, density 1.19 kg/L. Calculate the concentration of solution So. 4.2 ml of So are diluted to 500ml solution called S. We titrate S with 200 ml of …

More Similar Questions