Preview

Introduction to Acids Base chemistry

Good Essays
Open Document
Open Document
1948 Words
Grammar
Grammar
Plagiarism
Plagiarism
Writing
Writing
Score
Score
Introduction to Acids Base chemistry
Introduction to Acids Base chemistry

Purpose
How to determine the constant equilibrium of an acid, Ka? How to evaluate the concentration (M) of an acid? In “part A” experiment, we would test the PH of different concentration of acetic acid (a weak acid which partially dissociated in water) with a PH probe. After we got the PH, we could find out the concentration of H+ by applying the relationship pH = -log [H+]. Having the determined value of [H+] of a weak acid with a known molar concentration [HA], The acid dissociation constant, Ka, can be determined according to Ka = [H+][A-] /[HA]. In “Part B” experiment, we use a strong acid (HCl) and a weak acid (acetic acid) titrates with a strong base (NaOH). In both titrations, we will monitor the change in PH to determine the volume of 0.100 M NaOH required neutralizing both 10ml sample of HCl and acetic acid. And refer to the neutralization reaction of these two acid, H+ (aq) + OH-(aq) → H2O(l) for HCl, and CH3COOH(aq) + OH-(aq) → CH3COO-(aq) + H2O(l) . as we can see , in both case, two reaction have 1:1 stoichiometry, the moles of NaOH added = moles of acid present in the 10.00 mL sample , this will allow to calculate the concentration of acid in the original sample.
Procedure

“Part A” experiment:
1. Prepare 100 ml of 0.020M acetic acid solution using the provided 2.00M acetic acid stock solution.
2. Use M1*V1 = M2V2 to calculate the volume require to make 100 ml of 0.020M acetic acid solution.
3. Pipet the required volume of 2.00M acetic acid stock solution into a 100-ml volumetric flask, add some (25-50 mL) distilled water and swirl to mix, then add enough distilled water to bring the total solution volume to the 100 mL mark. To prevent overshooting the mark, use a wash bottle filled with distilled water for the last few ml. Stopper the flask and invert several times to mix thoroughly. 

4. Use a utility clamp to secure a PH Sensor to a ring stand.
5. Connect the probe with the computer interface,

You May Also Find These Documents Helpful

  • Good Essays

    Devry week five chem Ilab

    • 496 Words
    • 2 Pages

    Step 1: Obtain acid, in a 100 ml Erlenmeyer flask add 35 ml of an Unknown HCl solution.…

    • 496 Words
    • 2 Pages
    Good Essays
  • Satisfactory Essays

    LAB 20C

    • 561 Words
    • 3 Pages

    2. To titrate an acetic acid solution with 0.50M sodium hydroxide, and determine the molarity and percentage composition of the vinegar.…

    • 561 Words
    • 3 Pages
    Satisfactory Essays
  • Good Essays

    1. To titrate a hydrochloric acid solution of “unknown” concentration with standardized 0.5M sodium hydroxide.…

    • 1882 Words
    • 12 Pages
    Good Essays
  • Good Essays

    ka lab report

    • 692 Words
    • 3 Pages

    We will be using the LoggerPro and LabPro in order to help us determine our data. The purpose of this experiment is to follow the changes of pH during the titration of an acid and a base in order to determine the of the weak acid, . is a constant for a given acid at a given temperature. In this experiment we determined the Ka using two different methods: 1) the measurement of the pH of a solution containing a known concentration of a weak acid, and 2) measurement of the pH at the half-neutralization point in the titration of a weak acid and a strong base.…

    • 692 Words
    • 3 Pages
    Good Essays
  • Good Essays

    Chem Lab.

    • 520 Words
    • 3 Pages

    8. Add 10 to 15mL of acid to your vial and record the ending volume on your lab sheet.…

    • 520 Words
    • 3 Pages
    Good Essays
  • Good Essays

    5. Pour the solution out, rinse the cup and thermometer, and repeat steps 1-4 using a different ratio of the two substances, always keeping the volume at 50.0mL.…

    • 1033 Words
    • 5 Pages
    Good Essays
  • Satisfactory Essays

    18. You need to prepare 25.0mL of a solution of 1.5M HCl. Your lab provides you with 6M HCl stock solution. How do you prepare the solution you need?…

    • 464 Words
    • 2 Pages
    Satisfactory Essays
  • Satisfactory Essays

    Dye Analysis Lab Report

    • 978 Words
    • 4 Pages

    5) Using a serological pipet for accurate volume measurements, dilute the stock solution as indicated in the following table to prepare 10 mL each of a series of standard solutions, B-H. Thoroughly mix each solution. Hint: To avoid contaminating the stock solution, and then measure and add the required amount of stock solution to each test tube.…

    • 978 Words
    • 4 Pages
    Satisfactory Essays
  • Satisfactory Essays

    Lab 5 Acid Base Chemistry 2

    • 1240 Words
    • 17 Pages

    No credit will be given for this lab report if the Data section is not completely filled out and if the required photographs are not received. At least one photograph must show the student’s face.…

    • 1240 Words
    • 17 Pages
    Satisfactory Essays
  • Good Essays

    Acid strength is measured by how much it dissociates. This is determined by the amount of hydronium ion formed in water. Most often, it is expressed by pH, which equals the –log[H3O+]. The equilibrium constant for an acid is represented by Ka = [H3O+] [A-] / [HA], where HA is the acid and A- is the dissociated acid. When comparing Ka’s, most commonly pKa is used, which is equal to –log Ka.…

    • 1365 Words
    • 6 Pages
    Good Essays
  • Satisfactory Essays

    1. Identify the acid/base and their conjugate base/acid, and which definition you use to determine(Bronsted,…

    • 526 Words
    • 3 Pages
    Satisfactory Essays
  • Good Essays

    Unknown Acid Titration

    • 1249 Words
    • 5 Pages

    4. Accept the values that are within 1.0 of each other. Calculate the average of all the acceptable values and then repeat for the remaining acids.…

    • 1249 Words
    • 5 Pages
    Good Essays
  • Good Essays

    The theme of Sir Gawain and The Green Knight is Chivalry. This was written in dialect and said to be written by a monk, but author remains unknown. In Sir Gawain and the Green Knight, The Green Knight was a creation by Arthur’s half-sister, Morgan le Fay, the ruler of mysterious Avalon, to embarrass the knights of his court. The Green Knight approaches the court offering beheading games and the winnings game while holding a holly-bundle and an axe in his hands. The holly-bundle symbolizes peace. Sir Gawain speaks up saying that he’s the weakest and should participate because he’d be the least loss to King Arthur’s (governor of Camelot) court. This all takes place around New Year’s Day and they call it Christmas-tide. A description of the Green Knight: All green except for his eyes. They were red. Sir Gawain was supposed to leave on November 1st, All Saints Day. This is a special day for praying to the saints. This day would have been better for Sir Gawain to leave, but he leaves on the 2nd, named All Souls Day. All Souls Day are prayers for deceased held in a place to speed to heaven. Sir Gawain is undergoing a test to prove he’s a Chivalric knight. The castle he visits represents heaven on earth and the guy Porter represents Peter. Gawain was given beautiful clothes as well as food to eat. He comes to the realization that he made a bargain and he has to deal with it. The woman he spoke to at the castle told him if he valued his life he would wear a sash, he was also told it would save his life. A servant accompanying Gawain to the games told him he wouldn’t tell if he chickened. Sir Gawain goes into the Wild West and hears a sound. It’s dark humor, the sound of the Green Knight sharpening his axe. In line 2214, he says he’s leaving, but a voice yells for him to stay. Sir Gawain looks up only to find the Green Knight standing over him and in that moment he knew he would be…

    • 598 Words
    • 3 Pages
    Good Essays
  • Satisfactory Essays

    Answer the questions. When you are finished, submit this assignment to your teacher by the due date for…

    • 251 Words
    • 2 Pages
    Satisfactory Essays
  • Better Essays

    Add 10 ml of 50% of acetic acid was drawn by pipettes with plastic pipette pump and released into 50 ml Falcon tube. And, 5 ml of fresh milk was then drawn and released into falcon tube, where 10 ml of acetic acid contained. The first step was to mix the solution by gently inverting few times the falcon tube.…

    • 1541 Words
    • 7 Pages
    Better Essays