chemistry

A solution is made by adding 5.0 g Na2CO3 * 10H2O to enough water to make a 500 mL solution. what is the molarity.
I have: M=mol solute/liter solution = (5/286)/.5 = .035M
286 is what i got for the molar mass of Na2CO3 * 10H2O

Is that correct?? I think it is, but the next problem refers back to that problem and makes me think i did something wrong:

How much of this 500 mL solution should be used and diluted to make 250 mL of a .035 M solution

if the concentration is already .035 shouldnt it just be 250 mL????????

  1. 👍
  2. 👎
  3. 👁
  1. It looks ok to me.

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. Chemistry help please!

    Why does a clear, saturated solution of PbI2 form a yellow precipitate when a small amount of KI is added to the solution? A. KI is insoluble in PbI2. B. PbI2 is always insoluble in water. C. Adding KI is like adding I-, which

  2. Chem

    1) Which solution will have the lowest OH- A) Na2CO3 B) NaHCO3 C) NaCl D) NaHSO4 E) NH4Cl 2) Which solution will be the strongest base? A) Na2CO3 B) NaHCO3 C) NaCl D) NaHSO4 E) NH4Cl 3) Which aqueous solutions are acidic? A)

  3. Chemistry

    Suppose you wanted to dissolve 106g of Na2CO3 in enough H2O to make 6.00 L of solution. A. What is the molar mass of Na2CO3? B. What is the morality of this solution?

  4. College chemistry

    A buffered solution is made by adding 50.0 g NH4Cl to 1.00 L of a 0.70 M solution of NH3. Calculate the pH of the final solution. (Assume no volume change.)

  1. chemistry

    A buffer is made by adding 0.300 mol HC2H3O2 and 0.300 mol NaC2H3O2 to enough water to make 1.00 L of solution. The pH of the buffer is 4.74 . Calculate the pH of this solution after 0.020 mol of NaOH is added.

  2. science

    if a solution is made by adding 83 grams.of soduim hydroxide to 750 ml.of water what is the percent by mass of sodium hydroxide in the solution?

  3. College Chemistry

    a solution contains .25M Ni(NO3)2 and .25 M Cu(NO3)2. Can the metal ions be separated by slowly adding Na2CO3?Assume that for successful separation 99% of the metal ion must be precipitated before the other metal ion begins to

  4. chemistry

    When a solution of 6M HCl is made from a stock of concentrated HCl by adding an equal volume of water, why is the concentration of the solution only an approximate concentration?

  1. chemistry

    What is the percent by mass of 3.55 g NaCl dissolved in 88 g H2O? 2. A solution is made by adding 1.23 moles of KCl to 1000.0 g of water. What is the % by mass of KCl in this solution? 3. If you have 100.0 mL of a 25% aqueous

  2. Chemistry

    What is the pH and pOH of a solution that was made by adding 400mL of water to 350mL of 5.0x10^-3 M NaOH solution?

  3. chemistry

    An experiment in your laboratory requires 500 mL of a .0200 M solution of Na2CO3. You are given solid Na2CO3, distilled water and a 500 mL volumetric flask Describe how to prepare the required solution showing all calculations and

  4. chemistry

    What is the pH and pOH of a solution made by adding water to 15 grams of hydroiodic acid until the volume of the solution is 2500 mL? (hint: you must calculate the molarity first)

You can view more similar questions or ask a new question.