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    Department of Pure and Applied Chemistry: Analysis of An Antacid

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    kat kat
    This document describes a laboratory experiment analyzing an antacid tablet. The experiment involves titrating a sample of the antacid against hydrochloric acid and sodium hydroxide solutions to determine the amount of acid neutralized. Key steps included preparing and rinsing the burets, performing three trials of each titration, and calculating the moles of acid reacted based on the titration results. The conclusions and questions address explaining the chemical reactions, why burets must be rinsed, and making calculations related to the experiment.

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    Department of Pure and Applied Chemistry: Analysis of An Antacid

    Uploaded by

    kat kat
    42 views5 pages
    This document describes a laboratory experiment analyzing an antacid tablet. The experiment involves titrating a sample of the antacid against hydrochloric acid and sodium hydroxide solutions to determine the amount of acid neutralized. Key steps included preparing and rinsing the burets, performing three trials of each titration, and calculating the moles of acid reacted based on the titration results. The conclusions and questions address explaining the chemical reactions, why burets must be rinsed, and making calculations related to the experiment.

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    Chem_140_No._6.docx

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    This document describes a laboratory experiment analyzing an antacid tablet. The experiment involves titrating a sample of the antacid against hydrochloric acid and sodium hydroxide solutions to determine the amount of acid neutralized. Key steps included preparing and rinsing the burets, performing three trials of each titration, and calculating the moles of acid reacted based on the titration results. The conclusions and questions address explaining the chemical reactions, why burets must be rinsed, and making calculations related to the experiment.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    42 views5 pages

    Department of Pure and Applied Chemistry: Analysis of An Antacid

    Uploaded by

    kat kat
    This document describes a laboratory experiment analyzing an antacid tablet. The experiment involves titrating a sample of the antacid against hydrochloric acid and sodium hydroxide solutions to determine the amount of acid neutralized. Key steps included preparing and rinsing the burets, performing three trials of each titration, and calculating the moles of acid reacted based on the titration results. The conclusions and questions address explaining the chemical reactions, why burets must be rinsed, and making calculations related to the experiment.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 5

    DEPARTMENT OF PURE AND APPLIED CHEMISTRY

    College of Arts and Sciences


    VISAYAS STATE UNIVERSITY
    Visca, Baybay City, Leyte
    Chem 140 Laboratory

    Name: Honey Fher I. Casido Date Performed: October 17, 2018


    Lab Schedule: Wednesday (R196) 7:00-10:00 Date Submitted: October 24, 2018
    Group No.: 2 Rating:____________________

    EXERCISE NO.6
    Analysis of an Antacid

    I. Objectives

    Materials

    Acid buret 0.1 N HCl


    Base buret 0.1 N NaOH
    Buret Clamp phenolphthalein
    250mL Erlenmeyer flask Antacid sample
    Iron stand

    II. Results

    HCl
    Trial # Initial reading (mL) Final reading (mL) Titrant used(mL)
    1 28.7 29.4 0.7
    2 29.4 30 0.6
    3 30 30.7 0.7

    This study source was downloaded by 100000840281152 from CourseHero.com on 01-25-2022 17:05:53 GMT -06:00

    https://www.coursehero.com/file/37462791/Chem-140-No-6docx/
    NaOH
    Trial # Initial reading (mL) Final reading (mL) Titrant used (mL)
    1 31.4 31.7 0.3
    2 31.7 32 0.3
    3 32 32.3 0.3

    Computation Flow
    0.103mol
    Mole of HCl n= x volume of HCl
    L

    0.103mol
    Trial 1 n= x 0.0007 L of HCl n = 7.25 x 10-5 mol.
    L

    0.103 mol
    Trial 2 n= x 0.0006 L of HCl n = 6.18 x 10-5 mol.
    L

    0.103mol
    Trial 3 n= x 0.0007 L of HCl n = 7.25 x 10-5 mol.
    L

    0.106
    Mole of NaOH n= x volume of NaOH
    L

    0.106 mol
    Trial 1 n= x 0.0003 L of NaOH n = 3.18 x 10-5 mol.
    L

    0.106 mol .
    Trial 2 n= L x 0.0003 L of NaOH n = 3.18 x 10-5 mol.

    0.106 mol .
    Trial 3 n= L x 0.0003 L of NaOH n = 3.18 x 10-5 mol.

    Compute mole of HCl reacted with antacid


    Mol= mol. Of HCl – mol. Of NaOH
    Trial 1 = (7.25 x 10-5 mol HCl) – (3.18 x 10-5 mol. NaOH) T1 mol = 4.07 x 10-5 mol NaOH
    Trial 2 = (6.18 x10-5 mol HCl) – (3.18 x 10-5 mol NaOH) T2 mol = 3.10 x 10-5 mol NaOH
    Trial 3 = (7.25 x 10-5 mol HCl) – (3.18 x 10-5 mol. NaOH) T1 mol = 4.07 x 10-5 mol NaOH

    This study source was downloaded by 100000840281152 from CourseHero.com on 01-25-2022 17:05:53 GMT -06:00

    https://www.coursehero.com/file/37462791/Chem-140-No-6docx/
    III. Discussion

    A.Preparation of the acid/base burets, preparing the two buret for 0.1 N NaOH and 0.1 N
    HCl by rinsing each buret with each solution allowing the liquid to run out through the tip
    of the buret

    This study source was downloaded by 100000840281152 from CourseHero.com on 01-25-2022 17:05:53 GMT -06:00

    https://www.coursehero.com/file/37462791/Chem-140-No-6docx/
    IV. Conclusion

    V. Answers to Questions

    1. Write the chemical equations representing the chemical reactions involved in this
    Experiment.
    Answer: reaction of antacid in human stomach
    HCl (aq) > H+(aq) + Cl- (aq)
    H+ (aq) + OH- (aq) > H2O(i)
    2 H+ (aq) + CO32- (aq) > H2O(l) + CO2(g)
    Distillation of antacid in water and titration using acids and basis
    Mg (OH)2 + CO32-(aq) Mg 2+ + 2Cl- + 2H2O
    CaCO3 + 2HCl Ca2+ + 2Cl- + 2H2O

    Tablet [mg(OH)2 | CaCO3] + HCl > neutralized tablet + excess acid > acidic
    solution
    Excess HCl + NaOH > neutral solution

    2. Briefly explain why (a) each buret must be rinsed with the solution to be used, (b) any
    air space at the alkali buret nozzle must be removed before titration.
    Answer:
    (a) Each buret must be rinsed with the solution because when cleaning the glassware
    particularly buret, rinse it off with the solution to be used in the experiment. If the
    buret is not completely dry the time to use it for the experiment, the remaining traces

    This study source was downloaded by 100000840281152 from CourseHero.com on 01-25-2022 17:05:53 GMT -06:00

    https://www.coursehero.com/file/37462791/Chem-140-No-6docx/
    of the water on the inside will make your titrant more dilute and change its
    concentration.
    (b) Any air space at the alkali buret nozzle must be removed before titration because a
    bubble in the nozzle of buret will produce an inaccurate volume reading if the bubble
    escapes during titration. During a titration such small bubbles begin to move in the
    direction of the nozzle but may remain in place even though there is a moderate flow
    of titrant (above right). Even when the buret valve is wide open some bubbles remain
    in place until yountake your eyes off them. Then they sneak through the nozzle and
    ruin the titration.

    3. Calculate the theoritical number of moles HCl equivalent to 1 mole of (a) NaHCO 3
    (b) CaCO3 (c) Al2O3.

    4. How many miligrams of NaHCO 3 is in a 500-mg tablet if 40.00 mL of 0.12N HCl is


    required for neutralization of this sample?

    This study source was downloaded by 100000840281152 from CourseHero.com on 01-25-2022 17:05:53 GMT -06:00

    https://www.coursehero.com/file/37462791/Chem-140-No-6docx/
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