CHEMISTRY TITRATION Q

The titration of 25.00mL of Ba(OH)2 solution with an aqueous solution of 0.500 M HCl reaches an end point when 30.20 mL of the HCl solution is added. Determine the concentration of M of the Ba(OH)2 solution.


Soo 25.00mL=0.025L
30.20mL= 0.0302L

moles= MxL (0.500M)(0.0302L)=0.5302 moles of HCl and since the moles are the same at the end point than 0.5302 is moles of Ba(OH)2 too?

M=moles Ba(OH)2/initial L 0.5302/0.025L= 21.2M is my answer

but the book says the answer is 0.302M
what have I done wrong?? Thanks!!

  1. 👍 0
  2. 👎 0
  3. 👁 186
asked by LISA
  1. Why do you think the moles HCl and Ba(OH)2 are the same? Did you write the equation?
    2HCl + Ba(OH)2 ==> BaCl2 + 2H2O

    1. 👍 0
    2. 👎 0
  2. because at end point the solution is neutral, so the # of moles are the same? No ...so what do I do differently??

    1. 👍 0
    2. 👎 0
    posted by LISA
  3. The solution may be neutral BUT the two reagents do not react 1:1 and we must correct for that (and the moles are not the same).
    2HCl + Ba(OH)2 ==> BaCl2 + 2H2O
    moles HCl = M x L = 0.500 x 0.03020 = 0.01510 (I don't know where your number came from; probably punched into the calculator wrong since the numbers are correct.).
    Now convert moles HCl to moles Ba(OH)2.
    moles Ba(OH)2 = moles HCl x (1 mole Ba(OH)2/2 moles HCl) = 0.01510 x (1/2) = 0.00755 moles Ba(OH)2.
    M Ba(OH)2 = mols/L = 0.00755/0.025 = 0.3020 which rounds to 0.302 to three s.f.

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. chemistry

    In Chemistry: what is ph during the titration of 20.00ml of 0.1000m triethylamine (ch3ch2)3n (kb=5.2x 10-4) with 0.1000m HCL solution after the additions of titrant : a) 0ml (b) 10.00ml (c) 19.00ml (d)15.00ml (e) 20.00ml (f)

    asked by jain on October 17, 2011
  2. chemistry

    A flask containing 5.00mL of 3 M HCl solution requires 14.45mL of 1.00 M NaOH for titration. How many moles of HCl are present in the solution? The density of 3 M HCl is 1.05g/mL

    asked by John on June 12, 2010
  3. chemistry

    A flask containing 5.00mL of 3 M HCl solution requires 14.45mL of 1.00 M NaOH for titration. How many moles of HCl are present in the solution? The density of 3 M HCl is 1.05g/mL

    asked by John on June 13, 2010
  4. Chemistry Lab

    A student who is performing this experiment pours an 8.50mL sample of saturated borax solution into a 10mL graduated cylinder after the borax has cooled to a certain temperature, T. The student rinses the sample into a small

    asked by ConfusedStudent on March 13, 2013
  5. chemistry

    In a titration experiment, 22.00mL of a NaOH solution are required to neutralize 24.02 mL of a 0.1094 M HCL solution. what is the molarity of H+ in the HCL solution? (same as the molarity of HCL)

    asked by sari on November 9, 2011
  6. Chemistry

    10.0 mL of a 0.300M NH3 solution is titrated with a 0.100M HCl solution. Calculate the pH after the following additions of HCl. 0.00mL 10.00mL 30.00mL 40.00mL

    asked by Raven on March 30, 2013
  7. Chemistry

    For the titration of 50.00mL of 0.1000 M ammonia with 0.1000 M HCl, calculate the pH (a) before the addition of any HCl solution (b) after 20.00mL of the acid has been added

    asked by Anonymous on March 3, 2015
  8. Chemistry

    two aqueous solutions (solution A and solution B) contain different non reactive solutes and have densities of 1.021 g/ml and 1.190 g/ml, respectively. when 40.00 ml of solution A is mixed with 10.00ml of solution B what is the

    asked by Anonymous on September 5, 2016
  9. ANALYTICAL CHEMISTRY

    3. How many moles of HCl are required to make 15.00 mL of an aqueous 2.500 molar HCl solution? How many moles of Cl- are in 1.000 mL of the aqueous 2.500 molar HCl solution mentioned above? How many moles of H+ are in 1.000 mL of

    asked by JONESTONE on May 6, 2012
  10. ANALYTICAL CHEMISTRY

    3. How many moles of HCl are required to make 15.00 mL of an aqueous 2.500 molar HCl solution? How many moles of Cl- are in 1.000 mL of the aqueous 2.500 molar HCl solution mentioned above? How many moles of H+ are in 1.000 mL of

    asked by JONESTONE on May 6, 2012

More Similar Questions