Chemistry Lab Question Bank (2014-2015) Topic: Introduction 1. What is a standard solution? 2. What is a primary standard solution? Give examples. 3. What is a secondary standard solution? Give examples. 4. What is a link solution? 5. Why is KMnO4 not a primary standard solution? 6. Define equivalent weight? 7. Define end point and equivalence point? 8. Why solutions of HCl and NaOH are not primary standard solutions? 9. How many types of titrations are there? Give examples. 10. Define Molarity
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iron (II) solution into a 250 mL Erlenmeyer flask. 5) Titrate the acidic iron (II) sample with KMnO4 (aq). 6) Repeat steps 4 and 5 until three consistent results are obtained within 0.1 mL. 7) Pipette 10.0 mL of H2O2 (aq) solution into a clean 250 mL Erlenmeyer flask. 8) Measure out 5.0 mL of H2SO4 (aq) solution and add it to the 10 mL H2O2 (aq) solution. 9) Titrate the acidic H2O2 (aq) solution with KMnO4 (aq). 10) Repeat steps 7-9 until three consistent results are obtained within 0.1 mL. 11) Dispose
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OF AN UNKNOWN CONCENTRATION OF KMnO4 OBJECTIVE 1. To determine the maximum wavelength of potassium permanganate. 2. To plot the calibration curve of potassium permanganate. 3. To determine the concentration of an unknown solution of potassium permanganate. APPARATUS Beaker‚ burette‚ glass rod ‚volumetric flask 100ml ‚dropper CHEMICALS Potassium permanganate (KMnO4)‚ distilled water PROCEDURE A. Preparation of the KMnO4 standard solution 1. KMnO4 was weigh accurately to nearest
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titration. • To review the stoichiometry of an oxidation- reduction reaction. • To determine the concentration of an unknown sodium oxalate (Na2C2O4) solution by titrating it against standardized potassium permanganate solution (KMnO4). • To determine the percent by mass of Fe(II) in the form of ferrous ammonium sulfate Fe(NH4)2(SO4)2.6H2O in a mixture by redox titration. B. Theory: (electron transfer reactions) 2Mg (s) + O2 (g) 2MgO (s) 2Mg 2Mg2+
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presence of black‚ insoluble MnO2 solids has been investigated in this experiment. Parts 1A and 2A of the experiment are carried out at 25°C and 4°C‚ respectively. The same method and temperatures has been employed for the B part; only‚ the amount of KMnO4 added is twice the amount added in A. The calculated activation energy for B part is much lower than that of A part having a value of 24.91 kJ/mol. The calculated Arrhenius constant A‚ is also lower in B having a value of 34.84s-1. Results have shown
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stoichiometry of an oxidation-reduction reaction. • To practice the titration technique. • To determine the concentration of an unknown sodium oxalate (Na2C2O4) solution by titrating it against standardized potassium permanganate solution (KMnO4). Principle: Redox reaction is just like an acid-base reaction. An acid can show its acidic properties in the presence of base only. Like acid-base reaction‚ redox reactions are concerned with the transfer of electrons between species. One
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Reaction of Saturated and Unsaturated Hydrocarbons Objective: To carry out chemical test to differentiate an alkane and an alkene. Apparatus: dropper‚ test tube‚ hot plate Chemical reagents: bromine‚ toluene‚ cyclohexane‚ cyclohexene‚ acidified KMnO4‚ dichloromethane Method A. Bromine test 1.6 clean and dry test tube were taken and were labelled them A until F 2.1ml of dichloromethane were placed into each test tube 3.1 ml of cyclohexane were placed into tubes A and B‚1 ml cyclohexene were
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Exercise 5 Comparing the Reaction Rates of Alkanes and Alkenes Group # 4 Members: Pangan‚ Sam Margarette Perales‚ Angelica Ibay‚ Sophia Irigan‚ Sharien May Sorensen‚ John Antonio Ocan‚ Emmanuel Submitted to: Ms. Ginalyn Cuenca Mr. Neil Abreo Date: December 6‚ 2012 Introduction Alkanes are hydrocarbons with only single bonds between the atoms. Saturated hydrocarbon is the other term for it. They are used as fuels because they are non-reactive and also do not conduct electricity
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+H2O B. Oxidation of Alcohols Test Sample Equation Ethyl Alcohol C2H5OH + KMnO4 CH3COOH + H2O + MnO2 +K+ Isopropyl Alcohol 2(CH3)2CHOH + KMnO4 2(CH3) 2CO + 2H2O + MnO2 + K+ Tert-butyl Alcohol No reaction Benzyl Alcohol C6H5CH2OH + KMnO4 C6H5COOH + H2O +MnO2 + K+ Diethyl Ether C4H10O + KMnO4 C4H8O2 + H2O + MnO2 + K+ C. Reaction of Phenols Test Sample Equation Phenol C6H5OH + 3Br2 C6H5OHBr3 + 3HBr C6H5OH + KMnO4 C6H4O2 + MnO2 + H2O + K+ FeCl3 + 6C6H5OH [Fe(OC6H5) 6] 3- + 3H+ + 3Cl-
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Keghan Chapter 8 MULTIPLE CHOICE QUESTIONS Topic: Structure Elucidation 1. An alkene adds hydrogen in the presence of a catalyst to give 3‚4-dimethylhexane. Ozonolysis of the alkene followed by treatment with zinc and acetic acid gives a single organic product. The structure of the alkene is: CH3 A) CH3CH=C-CHCH2CH3 (cis or trans) CH3 CH3 B) CH3CH2C=CCH3 (cis or trans) CH2CH3 C) CH3 CH2=CCH2CHCH2CH3 CH3 CH2 D) CH3CH2CCHCH2CH3 CH3 CH3 E) CH3CH2CHCHCH=CH2
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