Chemistry

Citric acid, the compound responsible for the sour taste of lemons, has the following elemental composition: C{\rm C}, 37.51%\%; H{\rm H}, 4.20%\%; O{\rm O}, 58.29%\%.Calculate the empirical formula of citric acid

  1. 👍 0
  2. 👎 0
  3. 👁 887
asked by Ana
  1. Take a 100 g sample. This gives you
    37.51g C.
    58.29g O
    4.20g H.
    Convert to mols.
    mols = grams/molar mass

    37.51/12 = approx 3.13
    58.29/16 = approx 3.64
    4.20/1 = approx 4.20

    Now find the ratio of the elements to each other with the smallest whole number being 1.00. The easy way to do that is to divide all of the numbers by the smallest value; in this case that is 3.13.
    C = 3.13/3.13 = 1.000
    O = 3.64/3.13 = 1.16
    H = 4.20/3.13 = 1.34

    You may not round these numbers to whole numbers. What you do is multiply each by a whole number, startinhg with 2 and progressing by integers until you get a set of whole number.
    by 2 gives 2:2.32:2.68
    by 3 gives 3:3.48:4 and that tells you that by multiplying by 6 that 3.5 will become a whole number so
    by 6 gives 6:7:8 so the empirical formula is C6H8O7

    1. 👍 2
    2. 👎 0
    posted by DrBob222
  2. That’s exactly what I got

    1. 👍 0
    2. 👎 0
    posted by Chelsea

Respond to this Question

First Name

Your Response

Similar Questions

  1. chem

    Citric acid, the compound responsible for the sour taste of lemons, has the following elemental composition: C, 37.51%; H, 4.20%; O, 58.29%. Calculate the empirical formula of citric acid. (Type your answer using the format CO2

    asked by hannah on November 14, 2010
  2. chem

    Citric acid, the compound responsible for the sour taste of lemons, has the following elemental composition: C, 37.51%; H, 4.20%; O, 58.29%. Calculate the empirical formula of citric acid. so i did that and got C6H8O7 but now i

    asked by Sara on May 14, 2011
  3. Chemistry

    Citric acid H3C6H5O7, occurs in plants. Lemons contain 5% to 8% citric acid by mass. The acid is added to beverages and candy. An aqueous solution is 0.688m citric acid. The density is 1.049 g/ml. What is the molar concentration?

    asked by Lauren on February 7, 2008
  4. Chemistry

    Citric acid H3C6H5O7, occurs in plants. Lemons contain 5% to 8% citric acid by mass. The acid is added to beverages and candy. An aqueous solution is 0.688m citric acid. The density is 1.049 g/ml. What is the molar concentration?

    asked by Lauren on February 7, 2008
  5. chemistry

    Calculate the empirical formula for each of the following natural flavors based on their elemental mass percent composition. vanillin (responsible for the taste and smell of vanilla): C 63.15% H 5.30% O 31.55%.

    asked by Mely on September 20, 2010
  6. chemistry

    Calculate the empirical formula for each of the following natural flavors based on their elemental mass percent composition. vanillin (responsible for the taste and smell of vanilla): C 63.15% H 5.30% O 31.55%.

    asked by Mely on September 19, 2010
  7. Chemistry

    Caprytic acid, also called octanoic acid, is an 8-carbon fatty acid that is used as a sanitizer on dairy equipment that comes in contact with milk. The acid has a molar mass of 144.21 g/mol. An aqueous solution of the sanitizer

    asked by Anonymous on January 5, 2014
  8. Chemistry

    I am really stuck, I have tried to look these up everywhere and I keep getting different answers. I have to find the balanced equations for: Magnesium + Citric acid Zinc + citric acid Copper + Citric acid Manganese + Citric acid

    asked by Franky on October 8, 2011
  9. chemistry

    Lactic acid, HC3H5O3(aq) is a weak acid that gives yougurt its sour taste(Yeeeeecccckkk). Calculate the pH of a 0.0010 mol/L solution of Lactic acid. The Ka for lactic acid is 1.4 x 10^-4

    asked by Geroge B. on April 5, 2008
  10. chemical question

    a) Sour milk pancakes do not taste sour when sour milk and baking soda are substituted for sweet milk and baking powder . Explain. b) How would these pancakes taste if sour milk and baking powder are used? c) How would they taste

    asked by Roger on October 23, 2011

More Similar Questions