Chemistry

A student heats 5.128g of the sodium carbonate/sodium bicarbonate mixture to a constant mass of 4.256g. Determine the mass of sodium bicarbonate present in the mixture.

  1. 👍
  2. 👎
  3. 👁
  1. I don't know if this is the right solution or not because you didn't list the temperature.
    Heating to about 270 C converts NaHCO3 to Na2CO3 quantitatively as follows:
    2NaHCO3 ==> Na2CO3 + H2O + CO2

    If heated to a higher temperature, Na2CO3 loses all of the CO2 to form Na2O and I don't think the problem has a solution for that scenario. So I will assume you are talking about the first reaction above.
    Here is what I would do.
    Subtract the two masses and that gives you 0.872 as the loss in weight and that is due to CO2 + H2O. You don't know how much of each you have but you can calculate it.
    Let x = g H2O
    and y = g CO2
    You know x + y = 0.872 grams.
    That's one equation in two unknowns.
    The second one is that you can tell from the equation that moles CO2 and moles H2O are the same (they are equal).
    So
    (x/molar mass H2O) = (y/molar mass CO2)
    That's the second equation.
    Solve these to equations for x and y to determine grams H2O and grams CO2.
    Then choose either one, and convert g of what you chose to moles, convert moles of the product to moles NaHCO3, then convert moles NaHCO3 to grams NaHCO3. That's the answer you are looking for. Good problem.

    1. 👍
    2. 👎
  2. Awesome. Thanks!

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. Chemistry

    Explain how you would obtain solid sodium carbonate from a mixture of lead carbonate and sodium carbonate powder

  2. science

    A mixture of benzenoic acid aniline and phenol is dissolved in chroloform and the solution was treated with sodium hydroxide.hydrochloric acid and sodium bicarbonate.show the separation chart,identify the composition of each phase

  3. Chemistry

    when heated, sodium bicarbonate, NaHCO3, decomposes into sodium carbonate, Na2CO3, water, and carbon dioxide. If 5.00 g of NaHCO3 decomposes what is the mass of the carbon dioxide produced?

  4. chem

    Some sulfuric acid is spilled on a lab bench. It can be neutralized by sprinkling sodium bicarbonate on it and then mopping up the resultant solution. The sodium bicarbonate reacts with sulfuric acid as follows. 2 NaHCO3(s) +

  1. chemistry

    What is the percentage by mass of sodium (Na) in a formula unit of sodium hydrogen carbonate (NaHCO3)?

  2. chem

    "The percentage of sodium hydrogen carbonate, NaHCO3, in a powder for stomach upsets is found by titrating .275 M hydrochloric acid. if 15.5 mL of hydrochloric acid is required to react with .500 g of the sample, what is the

  3. Chemistry

    Calcium Chloride reacts with sodium carbonate (aq) to form solid calcium carbonate and aqueous sodium chloride. Determine the volume of a 2.00M Calcium chloride solution that would be needed to exactly react with 0.0750L of 1.00M

  4. Chemistry

    A 10.00 gram solid sample consisting of a mixture of sodium chloride and potassium sulfate is dissolved in 100.0 mL of water is combined with another 200.0 mL solution that contains excess aqueous lead(II) nitrate. Upon mixing the

  1. chem

    In order to neutralize the acid in 10.0 mL of 18.0 mol/L sulfuric acid that was spilled on a laboratory bench, sodium bicarbonate (baking soda) was used. The container of baking soda had a mass of 155.00g before this use, and out

  2. chemistry

    Sodium carbonate, Na2CO3(s), can be prepared by heating sodium bicarbonate, NaHCO3(s). 2NaHCO3(s) Na2CO3(s) + CO2(g) + H2O(g) Kp = 0.23 at 100ÂșC If a sample of NaHCO3 is placed in an evacuated flask and allowed to achieve

  3. Chemistry

    A particular vinegar contains 4.0% CH3COOH by mass. It reacts with sodium carbonate to produce sodium acetate, carbon dioxide, and water. How many grams of carbon dioxide are produced by the reaction of 5.00 mL of this vinegar

  4. chem

    What mass of hydrochloric acid (in grams) can be neutralized by 2.3g of sodium bicarbonate? (: Begin by writing a balanced equation for the reaction between aqueous sodium bicarbonate and aqueous hydrochloric acid.)

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