chemistry

posted by .

Hi Cna someone please tell me what I must out into the Trial 1 column? It would be greatly appreciated.


theLab: Determining the Ksp For Ca(OH)2

Purpose: The purpose of this experiment is to determine the Ksp for calcium hydroxide.

Experimental Design: A saturated solution of calcium hydroxide is titrated with a hydrochloric acid solution of known concentration to a bromophenol blue endpoint (yellow).

Materials:

50.0 mL of 0.10 M HCl(aq)
bromophenol blue indicator
50.0 mLsaturated calcium hydroxide
50.0 mL buret
125 mL Erlenmeyer flask
50.0 mL of distilled water
10 mL pipet with pump
waste beaker

Procedure:

1.Fill the buret with the acid solution.
2.Pipet 10.0 mL of calcium hydroxide into the flask.
3.Add approximately 10.0 mL of water to the flask.
4.Add 4 drops of bromophenol blue to the flask.
5.Titrate the base to an endpoint and record the volume of acid added.
6.Dispose of the flask contents into a waste beaker.
7.Repeat steps 2-6 four more times.

Analysis:

1.Present your data in a table. Use the following table as a guide:

Trial 1 Trial 2
Initial volume of HCl(mL)
Final volume of HCl(mL)
Volume of HCl added(mL)

  • chemistry -

    125 mL Erlenmeyer flask
    50.0 mL of distilled water
    10 mL pipet with pump
    waste beaker

    Procedure:

    1.Fill the buret with the acid solution.
    2.Pipet 10.0 mL of calcium hydroxide into the flask.
    3.Add approximately 10.0 mL of water to the flask.
    4.Add 4 drops of bromophenol blue to the flask.
    5.Titrate the base to an endpoint and record the volume of acid added.
    6.Dispose of the flask contents into a waste beaker.
    7.Repeat steps 2-6 four more times.

    Analysis:

    1.Present your data in a table. Use the following table as a guide:

    Trial 1 Trial 2
    Initial volume of HCl(mL)
    Final volume of HCl(mL)
    Volume of HCl added(mL)

  • chemistry -

    If you have all of the information posted, then 500 mL of the saturated solution of Ca(OH)2 must have used 0.10 x 0.050 L = 0.005 mols HCl. The reaction is
    Ca(OH)2 + 2HCl ==> CaCl2 + 2H2O.
    Therefore, mols Ca(OH)2 must be 1/2 of the HCl mols or 0.005/2 = 0.0025.
    From there you can calculate (Ca^+2) and (OH^-) and Ksp. Post your work if you get stuck or if I have misinterpreted the problem. Can it be chance that you used EXACTLY 50.0 mL HCl or is that what you started with?

  • chemistry -

    Let me repost the important information only:

    Purpose: The purpose of this experiment is to determine the Ksp for calcium hydroxide.

    Materials are:
    *50.0 mL of 0.10 M HCl(aq)
    *bromophenol blue indicator
    *50.0 mLsaturated calcium hydroxide
    *50.0 mL buret
    *125 mL Erlynmyer Flask
    *50.0 mL of distilled water
    *10.0 mL pipet with pump
    *waste beaker

    The procedure for the lab is:
    1.Fill the buret with the acid solution.
    2.Pipet 10.0 mL of calcium hydroxide into the flask.
    3.Add approximately 10.0 mL of water to the flask.
    4.Add 4 drops of bromophenol blue to the flask.
    5.Titrate the base to an endpoint and record the volume of acid added.
    6.Dispose of the flask contents into a waste beaker.
    7.Repeat steps 2-6 four more times.

    The following is what I am having trouble with.

    Present your data in a table.Use the following table as a guide:
    Trial 1 Trial 2 Trial 3
    *Initial volume
    of HCL(mL)

    *Final volume
    of HCL (mL)

    *Volume of
    HCL added (mL)

    I am having difficulty regarding the trial 1 column. What is my initial volume of HCL(mL) supposed to be?

  • chemistry -

    The table doesnt want to be neat but the trial 1, trial 2 and trial 3 should be shifted more to the right side

  • chemistry -

    The initial volume of HCl is the reading of the buret at the beginning of the titration. It may or may not be zero. Then you have a final volume HCl. The volume of HCl added, then, is the difference between the two columns; i.e., the final volume reading minus the initial volume reading. For example, you may have started with a buret reading of 0.75 mL. That will be the initial volume of HCl. Then suppose you titrated with HCl and the indicator changed at 24.55 mL. That will be the final volume. Then the volume HCl used will be
    24.55 - 0.75 = 23.80 mL.

  • chemistry -

    Here are my results:


    *Initial volume
    of HCL(mL)
    Trial 1- 0.0
    Trial 2- 2.51
    Trial 3- 4.95
    Trial 4- 7.4
    Trial 5- 9.9

    *Final volume
    of HCL (mL)
    Trial 1- 2.51
    Trial 2- 4.95
    Trial 3- 7.4
    Trial 4- 9.9
    Trial 5- ?

    *Volume of
    HCL added (mL)
    Trial 1- 2.51
    Trial 2- 2.44
    Trial 3- 2.45
    Trial 4- 2.50
    Trial 5- ?


    How would I get Final volume of HC (mL) and Volume of HCL added (mL) for trial 5?

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. science

    can someone edit my lab report please? Here it is Purpose: The purpose of this experiment was to distinguish six substances observing how they react in fluids and to identify them by their properties. My hypothesis by the end of this
  2. chemistry

    Let me repost the important information only: Purpose: The purpose of this experiment is to determine the Ksp for calcium hydroxide. Materials are: *50.0 mL of 0.10 M HCl(aq) *bromophenol blue indicator *50.0 mLsaturated calcium hydroxide …
  3. chemistry

    Purpose: The purpose of this experiment is to determine the Ksp for calcium hydroxide. Materials are: *50.0 mL of 0.10 M HCl(aq) *bromophenol blue indicator *50.0 mLsaturated calcium hydroxide *50.0 mL buret *125 mL Erlynmyer Flask …
  4. English

    Purpose of the Olympic medals is to point out the achievements of the athletes and their countries. Any other info would be appreciated. Also, please tell me if this is correct, thanks
  5. Chemistry

    Hi everyone!!! Can someone please tell me the answer to the following questions?
  6. Chemistry

    Hello, I would greatly appreciate some help with the following problem, as I'm not sure how to proceed. I'm trying to find solubility (Ksp) of Cu(IO3)2 from titration experiment. The following equations were provided: Cu(IO3)2 --> …
  7. american Literature

    Which best describes the main purpose of The Declaration of Independence?
  8. Chem

    The following state were collected for determining the concentration of suspended solids in a water sample. (D= 1.01 g/mL). Express all calculated data with the correct number of significant figures. Volume of sample (mL): Trial 1: …
  9. chem

    The following state were collected for determining the concentration of suspended solids in a water sample. (D= 1.01 g/mL). Express all calculated data with the correct number of significant figures. Volume of sample (mL): Trial 1: …
  10. CHEM

    The following data were collected for determining the concentration of suspended solids in a water sample. (D= 1.01 g/mL). Express all calculated data with the correct number of significant figures. Volume of sample (mL): Trial 1: …

More Similar Questions