Chemistry pls clearly step step for me

2gm of mixture hydrated sodium carbonate and sodium bicarbonate was dissolved in water and made up to 250cc. 25cc of this solution was titrated using methyl orange as indicator and 22.5cc of 0.087N hcl were required for naturalization. calculate the percentage of sodium bicarbonate in the mixture. I do not still understand.
Please clearly step by step for me.
I understand 25/250 x 2 = 0.2g
na2c03 = 106 /2 22.5cc x 0.087N = 1.957g
nahc03 = 84
x/53 + y/84 = 1.957g this part I cannot calculate to get the right answer
How get the right answer 56.7%

  1. 👍 0
  2. 👎 0
  3. 👁 133
asked by ken
  1. And I can't calculate to obtain that answer either. I don't think the problem is worded correctly. Here is why I think that.
    If the sample is 56.7% NaHCO3 then it is 43.3% Na2CO3.
    g Na2CO3 = 2 x 0.433 = 0.866g Na2CO3
    g NaHCO3 = 2 x 0.567 = 1.134g NaHCO3
    total = 1.134+0.866 = 2.000g.

    We titrated 0.1 of that so we titrated
    0.0866g Na2CO3 + 0.1134g NaHCO3 and that is 0.0866+0.1134 = 0.2000 g titrated. How many mL of 0.087N HCl SHOULD THIS TAKE?
    mL x N x mew = grams or
    mL = g/(N*mew)
    For Na2CO3 mL = 0.0866/(0.087*0.053) = 18.78 mL to titrate the 0.0866g Na2CO3.

    For NaHCO3 mL = 0.1134/(0.087*0.084) = 15.52 mL to titrate the 0.1134g NaHCO3
    mL for Na2CO3 + mL for NaHCO3 = total mL = 18.78+15.52 = 34.3 mL and for the problem that should be 22.5 mL. It isn't; therefore, the problem is not possible to work as is. If the problem is changed so that the HCl used was 34.3 mL of 0.087N then it is worked as follows:
    eqn 1 is X + Y = 2
    eqn 2 is [0.1X/0.053]+ [0.1Y/0.084] = 34.3*0.087

    From eqn 2 we have
    1.8867X + 1.19Y = 2.984
    From eqn 1 if X+Y = 2 than X = 2-Y. Substitute that into eqn 2 as follows.
    1.8867(2-Y) + 1.19Y = 2.984
    3.7734 - 1.8867Y + 1.19Y = 2.984
    -0.6976Y = -0.7893
    Y = 1.133g NaHCO3
    % = (1.133/2)*100 = 56.6% NaHCO3

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. chemistry Please who helps me stpe by step

    2gm of mixture hydrated sodium carbonate na2c03 /OH20 and sodium bicarbonate was dissolved in water and made up to 250cc. 25cc of this solution was titrated, using methyl orange as indicator and 22.5cc of 0.087N hcl were required

    asked by ken on June 21, 2014
  2. Chemistry

    A weighed amount of sodium chloride is completely dissolved in a measured volume of 4.00 M ammonia solution at ice temperature, and carbon dioxide is bubbled in. Assume that sodium bicarbonate is formed until the limiting reagent

    asked by JUNDY on February 25, 2015
  3. Chemistry

    The most abundant cation in seawater is the sodium ion. The evaporation of seawater gives a mixture of ionic compounds containing sodium combined with chloride, sulfate, carbonate, bicarbonate, bromide, fluoride, and

    asked by Stephanie on January 27, 2012
  4. Chemistry

    1. Consider a 1.00g unknown sample that contains 62.0% sodium carbonate and 38.0% sodium bicarbonate, NaHCO3, by mass. When this sample is dissolved in water, how many mL of 0.200M HCl will be required to convert all of the

    asked by Mia on February 26, 2014
  5. 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.

    asked by Anna on February 28, 2010
  1. Chemistry

    A chemist prepared a solution by dissolving 52.0 g of hydrated sodium carbonate in water to a total volume of 5.00 dm3. The concentration was determined to be 0.0366 M. Determine the formula of the hydrated sodium carbonate.

    asked by Billy on November 18, 2015
  2. Chem

    A mixture of 5.00 g of sodium carbonate, Na2CO3 and sodium hydrogen carbonate, NaHCO3 is heated. The loss in mass is 0.31 g. Sodium carbonate does not decompose on heating. Calculate the percentage by mass of sodium carbonate in

    asked by Anonymous on June 14, 2015
  3. Chemistry

    A 3.23 gram sample of a sodium bicarbonate mixture was reacted with excess acid. 48.52 mL of the evolved gas was collected of the water at .930 atm. and 23.0 degrees C. What is the percentage of sodium bicarbonate in the original

    asked by Adele on April 23, 2011
  4. chemistry

    4.0 g of sodium bicarbonate 84 g/mol) decomposes to form carbon dioxide, water, and sodium carbonate (106 g/mol). What is the theoretical yield in grams for sodium carbonate?

    asked by Danae on January 26, 2012
  5. Chemistry

    Plan how you would make 100mL of a buffer solution with a pH of 10.80 to be made using only sodium carbonate, sodium hydrogen carbonate and water. You should specify the amount of sodium carbonate and sodium hydrogen carbonate

    asked by Parveen on August 12, 2012

More Similar Questions