analytical chemistry

Most popular questions
  1. Analytical Chemistry

    Current is applied to an aqueous solution of calcium sulfide. Multiple choice help please??! What is produced at the cathode? A) H2(g) B) S(s) C) O2(g) D) Ca(s) What is produced at the anode? A) O2(g) B) H2(g) C) Ca(s) D) S(s)

    asked by Sam on March 30, 2013
  2. Analytical Chemistry

    Carbon dioxide dissolves in water to form carbonic acid, which is primarily dissolved CO2. Dissolved CO2 satisfies the equilibrium equation. CO2(g) CO2(aq) The acid dissociation constants listed in most standard reference texts for carbonic acid actually

    asked by Sam on February 22, 2013
  3. Analytical Chemistry

    Phosphoric acid is a triprotic acid with the following pKa values: pka1: 2.148 pka2: 7.198 pka3: 12.375 You wish to prepare 1.000 L of a 0.0100 M phosphate buffer at pH 7.45. To do this, you choose to use mix the two salt forms involved in the second

    asked by Sam on February 22, 2013
  4. Analytical Chemistry

    How many milliliters of 0.0560 M EDTA are required to react with 50.0 mL of 0.0170 M Cu^2+? With 50 mL of 0.0170 M Sc^3+? My work so far: (50mL)(0.0170mmol/mL)= 0.85 mmol Cu^2+ I'm not sure how to do the rest. Please help.

    asked by Sam on March 4, 2013
  5. Analytical Chemistry

    I am trying to find moles of IO3 from Cu(IO3)2 10 ml and standardized sodium thiosulfate (Na2S2O3.5H20) .28 M. My calc is: 0.28 Moles Na2S2O3.5H20 * (2 moles of S2O3/1 mole Na2S2O3.5H20)* (2 moles of (IO3)/1 mole Cu(IO3)2= (1.12/.01 L) but that is why to

    asked by Max on October 11, 2010
  6. analytical chemistry

    blank is used to dissipate the error brought about by impurities. What is the other reason of using blank in Mohr method?

    asked by emily on November 5, 2010
  7. Analytical chemistry

    The iron in a 0.6656 g ore sample was reduced quantitatively to the +2 state and then titrated with 26.753 g of KMnO4 solution. Calculate the percent Fe2O3 in the sample. the mass i get for fe2o3 is too big, but i don't know how else to do this problem,

    asked by Gloria on August 3, 2013
  8. Analytical Chemistry

    The solubility-product constant for Ce(Io3)3 is 3.2 x 10^-10. What is the Ce^3+ concentration in a solution prepared by mixing 50.0 ml of 0.0500 M Ce^3+ with 50.00 ml of a. water b. 0.050 M Io3- c. 0.150 M Io3- d. 0.300 M Io3-

    asked by Hyein Mun on January 29, 2019
  9. Analytical chemistry

    A 25.0-mL solution of 0.0660 M EDTA was added to a 33.0-mL sample containing an unknown concentration of V3 . All V3 present formed a complex, leaving excess EDTA in solution. This solution was back-titrated with a 0.0450 M Ga3 solution until all the EDTA

    asked by Ashley on April 4, 2013
  10. Analytical Chemistry

    A 22.617 g sample of aqueous waste leaving a fertilizer manufacturer contains ammonia. The sample is diluted with 70.407 g of water. A 10.883 g aliquot of this solution is then titrated with 0.1072 M HCl. It required 29.32 mL of the HCl solution to reach

    asked by Sam on February 28, 2013
  11. Analytical Chemistry

    Calculate the pH at the equivalence point for the titration of 0.160 M methylamine (CH3NH2) with 0.160 M HCl. The Kb of methylamine is 5.0× 10–4. Methylamine is a weak base and reacts with HCl to give the methylammonium ion. HCl + CH3NH2 CH3NH3^+ + Cl^-

    asked by Sam on February 27, 2013
  12. Analytical Chemistry

    Could someone show me step by step how to solve this type of problem? I have to do several of them, and would love to understand what is actually happening! Thank you so much in advance, I appreciate your help and time! Calculate the weight percent of

    asked by DeeDee on June 5, 2016
  13. Analytical Chemistry

    You prepare a solution from 10.0 mL of 0.100 M MOPS buffer (3-morpholinopropane-1-sulfonic acid) and 10.0 mL of 0.086 M NaOH. Next, you add 1.00 mL of 8.87 × 10-4 M lidocaine to this mixture Denoting lidocaine as L, calculate the fraction of lidocaine

    asked by Sam on February 26, 2013
  14. Analytical Chemistry

    This question pertaining to buffer systems! How would you prepare 10.0mL of 0.0100M phosphate buffer, pH = 7.4 0, from stock solution of 0.100M KH2PO4 and 0.250M K2HPO4, pKa of KH2PO4 is 7.20. Please help me in figuring out how I even start this

    asked by Katie on August 3, 2016
  15. Analytical Chemistry

    A 10.0 mL sample of whiskey was diluted to 500.0 mL. A 4.00 mL aliquot of the diluted sample was removed and the ethanol, C2H5OH, was distilled into 50.00 mL of 0.02150 M K2Cr2O7 and oxidized to acetic acid. The excess Cr2O72– was then back titrated with

    asked by Kristin on October 18, 2015
  16. Analytical chemistry

    A 0.6334 gram of sample of impure mercury (II) oxide was dissolved in an unmeasured excess of potassium iodide. Reaction: HgO + 4I- + H2O ------→HgI42- + 2OH- Calculate the % HgO in the sample if titration of the liberated hydroxide required 42.59 ml of

    asked by Anonymous on February 6, 2013
  17. analytical chemistry

    a 0.4617g sample containing sodium bicarbonate was dissolved and titrated with standard 0.106M of hydrochloric acid solution , requiring 40.72ml. the reaction is: HCO3- + H+ -> H2O + CO2 Calculate the percent sodium bicarbonate in the sample. (Given

    asked by zzz on June 16, 2015
  18. Analytical chemistry

    A dilute perchloric acid solution was standardized by dissolving 0.2445 g of primary standard sodium carbonate in 50 mL of the acid, boiling to eliminate CO2, and back-titrating with 4.13mL of dilute NaOH. In a separate titration a 25mL portion of the acid

    asked by Gloria on August 1, 2013
  19. analytical chemistry

    how many grams of iron (111) sulfite pentahydrate are required to prepare a solution that has the equivalence of 0.339g of iron dissolved?

    asked by Wesley on April 17, 2019
  20. Analytical chemistry

    Calculate to four decimal places the mass of pure dry CaCO3 required to make 1 L of a 1000 ppm Ca stock solution.

    asked by Angel on October 20, 2016
  21. Analytical chemistry

    How many grams of solid CuSO4. 5H2O are needed to prepare a 500 ml of a 1000 ppm solution of Cu?

    asked by Lori on February 2, 2014
  22. Analytical Chemistry

    Consider the titration of 100.0 mL of 0.100 M NaOH with 1.00 M HBr. Find the pH at the following volumes of acid added and make a graph of pH versus Va: Va = 0,6 and 12 mL

    asked by canas on December 1, 2012
  23. analytical chemistry

    at elevated temperature, NaHCO3 (83.98g/mol) is converted quantitatively to Na2CO3 (105.98g/mol).Ignition of 0.3592g sample of an antacid tablet containing NaHCO3 and non volatile impurities yielded a residue weighing 0.2362g. Calculate the percent purity

    asked by Anonymous on January 26, 2014
  24. Analytical Chemistry

    Match the following terms about analytical precipitations to their definitions: A.) Coprecipitation B.) Adsorption C.) Absorption D.) Gathering E.) Masking F.) Digestion G.) Peptization 1.) Inclusion or occlusion of impurities within a crystal. 2.) Binding

    asked by Laura on February 28, 2014
  25. Analytical chemistry

    Below i wrote a few problems, i did them all but in the book i don't have results, so i don't know if i did them right or not. I would really appreciate if someone would go through the problems and tell me if i got the right results. If i made a mistake

    asked by Gloria on August 3, 2013
  26. Analytical chemistry

    What is the reaction & calculation when KIO3 mixed with KI, HCl by titration with Na2S2O3?

    asked by Selim on July 8, 2011
  27. analytical chemistry

    Write balanced net-ionic equations to describe: a. The oxidation of Mn2+ to MnO4- by ammonium peroxydisulfate [(NH4)2S2O8] b. The air-oxidation of HAsO32- to HAsO42- c. The oxidation of Ce3+ to Ce4+ by sodium bismuthate (NaBiO3) Write balanced net-ionic

    asked by Anonymous on February 14, 2013
  28. Analytical chemistry

    calculate the frequency of an Infrared light of wave number 2200cm^-1

    asked by KENRY on June 4, 2019
  29. Analytical chemistry

    Why HNO3 only can used for acidification in volhard method not other acids like HCl or H2SO4?

    asked by Amal on November 11, 2016
  30. analytical chemistry

    An EDTA solution is standardized against a solution of primary standard CaCO3 (0.5622 g dissolve in 1000 ml of solution) and titrating aliquots of it with the EDTA. If a 25.00 ml aliquot required 21.88 ml of the EDTA, what is the concentration of the EDTA?

    asked by Anonymous on February 3, 2013
  31. Analytical Chemistry

    A solution is prepared by dissolving 0.2222 (¡¾0.0002) g of KIO3 in 50.00 (¡¾0.05) mL. (i) Calculate the molar mass of KIO3 with its associated uncertainty to the correct number of significant figures. (ii) Find the molarity and its uncertainty with an

    asked by Matt on February 27, 2017
  32. Analytical Chemistry

    How many millimoles and molecules of solute are in 500 ml of a solution that is 5.41 ppm KMnO4?

    asked by Anna on April 18, 2012
  33. Analytical Chemistry

    Consider the titration of 100.0 mL 0.1 M KOH with 1.0 M HBr. Find the pH at the following volumes of acid (Va) added: Va= 0, 1, 10 and 10.1 mL.

    asked by Remy on November 26, 2011
  34. Analytical Chemistry

    When BaCl2-H2O (s) is dried in an oven, it loses gaseious water: BaCl2-H2O BaCl2(s) + H2O (g) enthalpy change - 63.11 kJ/mol at 25 degrees C entropy change - +148 J/(K-mol) at 25 degrees C Calculate the vapor pressure of gaseous H2O above BaCl2-H2O at

    asked by Tammy on October 25, 2010
  35. ANALYTICAL CHEMISTRY

    A sample weighing 1.25 mg containing a certain compound M (FW 292.16 g/mol) was dissolved in solvent in a 5.00 mL volumetric flask. A 1.00 mL aliquot was drawn up, placed in a 10.00 mL volumetric and diluted to the mark with solvent. The absorbance of this

    asked by KAMBOYI K on March 5, 2016
  36. Analytical Chemistry

    What fraction of piperazine (perhydro-1,4-diazine) is in each of its three forms (H2A, HA–, A2–) at pH 7.05? Not sure how to find k1 and k2 needed for the fraction formulas...please help :(

    asked by Sam on February 26, 2013
  37. analytical chemistry

    why is it necessary to use previously boiled and cooled distilled water in the dilution of your unknown carbonate mixture? can methyl orange be used as indicator if only NaOH is present in the sample?

    asked by tan ni on July 17, 2010
  38. Analytical chemistry

    Calculate pCd2 at each of the following points in the titration of 40.00 mL of 0.0040 M Cd2 with 0.0040 M EDTA in the presence of the auxiliary complexing agent NH3. The solution is buffered at a pH of 11.00. Take the NH3 concentration to be a constant

    asked by Ashley on April 4, 2013
  39. Analytical Chemistry

    Show the predominant form of the amino acid tyrosine at pH=13.9 and ph=7.8. Be sure to include the proper number of hydrogens on heteroatoms and the correct formal charges on atoms. I calculated the pka values for COOH (pka=2.41) NH3 (pka=8.67), and OH

    asked by Sam on February 26, 2013
  40. Analytical Chemistry

    A square photographic film 2.00 cm on an edge was suspended in a 5% solution of Na2S2O3 to form a Ag(S2O3)2^3- complex and release the halide. After removal and washing of the film, the solution was treated with an excess of Br2 in basic solution to

    asked by Jed on November 15, 2018
  41. Analytical chemistry

    The hydrogen sulfide in a 79.168 g sample of crude petroleum was removed by distillation and collected in a solution of CdCl2. The precipitated CdS was then filtered, washed and ignited to create CdSO4. Calculate the percentage of H2S in the sample if

    asked by Sam on January 28, 2016
  42. Analytical chemistry

    A 25 ml sample of household bleach was diluted to 500 ml in a volumetric flask. An unmeasured excess of potassium iodide was aded to a 20 ml aliquot of the diluted sample; the iodine liberated in the reaction: OCl- + 2I- -> I2 + Cl- + H2O required 34.5 ml

    asked by Gloria on July 30, 2013
  43. Analytical Chemistry

    Need help with question. Calculate the pH of a buffer prepared by adding 100mL of 0.0500M NaOH to 100mL of 0.175M CH3COOH. so far I have calculated mols of CH3COOH---->H+ + CH3OO- CH3COOH=0.1L*0.175mol/1L=0.0175mol OH-=0.1L*0.0500/1L=0.00500mol Not sure

    asked by Caral on October 15, 2011
  44. analytical chemistry

    Low concentration replicate samples of Pb-EDTA gave the following counts in a mass spectral measurement: 188.3, 145.9, 159.7, 174.7, 143.7, 213.1, 164.7, 169.3, 158.7, 176.3. Ten measurements of a blank had a mean of 27.3 counts. A sample containing 1.00

    asked by holly on March 3, 2013
  45. Analytical chemistry

    Calculate to four decimal places the mass of purely dry MgCO3(Magnesium Carbonate) required to make 1L of a 1000 ppm Mg stock solution.

    asked by cindy on October 20, 2016
  46. Analytical Chemistry

    Consider the titrations of 24mL of 0.050M HClO4 with 0.100 M KOH. Find the pH at the following volumes of KOH; Vb: 0.1, 5, 10, 12.40, 12.50, 12.60, 13 mL

    asked by Jocelyn on October 7, 2012
  47. Analytical Chemistry

    Solute S has a partition coefficient of 4.3 between water (phase 1) and hexane (phase 2). (a) Calculate the concentration of S in hexane if [Swater] is 0.030 M (b) If the volume of water is 71.0 mL and the volume of hexane is 16.0 mL, find the quotient

    asked by Anthony on November 15, 2012
  48. Analytical Chemistry

    Consider the titrations of 24mL of 0.050M HClO4 with 0.100 M KOH. Find the pH at the following volumes of KOH; Vb: 0.1, 5, 10, 12.40, 12.50, 12.60, 13

    asked by Jocelyn on October 7, 2012
  49. Analytical chemistry

    what is the mass (in milligrams) of solute in 26.0mL of 0.25M sucrose (342g/mol)?

    asked by engr on October 7, 2012
  50. Analytical Chemistry

    Calculate the number of grams needed to be dissolved and diluted to 100 ml to prepare 0.200M solution for the following substance BaCrO4. huh?

    asked by Stumped on October 16, 2011
  51. Analytical Chemistry

    why is it necessary to store AgNO3 solution in an amber bottle? Why must volhard titration be carried out in strongly acidic medium? Why is titration of AgNO3 with KSCN be done with vigorous swirling?

    asked by anonymous on July 25, 2008
  52. Analytical Chemistry

    Suggest a range of sample masses for the indicated primary standard if it is desired to use between 35 and 45mL of titrant: (a) 0.175 M HClO4 titrated against Na2CO3(CO2 product) (b) 0.085 M HCl titrated against Na2C2O4 Na2C2O4-->Na2CO3+CO

    asked by Cherie on October 29, 2014
  53. Analytical Chemistry

    I need to determine the moles of EDTA in a 1:1 stoichemetric titration of a 10.0 mL aliquot of .2108 g of CaCO3 dissolved in 100ml of h2o please help

    asked by Chad Carl on December 11, 2011
  54. analytical chemistry

    Calculate the ph during the titration of 20.0ml 0.5000M ethanoic acid Ka=0.0000175 with 0.500M NaOH after the addition of 0.0ml and 10.0ml NaOH

    asked by Anonymous on June 15, 2018
  55. analytical chemistry

    Calculate the concentration of the initial nitrate stock solution (in ppm) if exactly 0.361 g of KNO3 is dissolved in a 1 L volumetric flask with distilled water. Here I want the concentration of nitrogen in ppm.

    asked by Angel on September 22, 2016
  56. Analytical chemistry

    A 24.393 g sample of aqueous waste leaving a fertilizer manufacturer contains ammonia. The sample is diluted with 80.601 g of water. A 12.404 g aliquot of this solution is then titrated with 0.1059 M HCl. It required 31.61 mL of the HCl solution to reach

    asked by Ashley on April 4, 2013
  57. Analytical Chemistry

    Predict the effect (Increase, Decrease, No effect, Indeterminate)and explain why 1. Condition: In the determination of water hardness, the water sample contained appreciable amount of ferric ions Paameter: ppm CaCO3 2. Condition: Instead of MgCl2*H2O,

    asked by :kkk: on August 31, 2007
  58. ANALYTICAL CHEMISTRY

    Explain the following statement: "The validity of a chemical analysis ultimately depends on measuring the response of the analytical procedure to known standards." (b) Calibration curves are necessary in many chemical measurements involving

    asked by KAMBOYI KAMBOYI on March 13, 2016
  59. 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 the aqueous 2.500 molar

    asked by JONESTONE on May 6, 2012
  60. Analytical Chemistry

    A 500-mL buffer was prepared and it is 0.300 M in nitrous acid (HNO2 , Ka = 4.0 x 10-4) and 0.200 M in sodium nitrite, NaNO2. What will be the pH of this solution after adding 1.00 mL of 6.00 M HCl?

    asked by Allene on August 26, 2014
  61. Analytical chemistry

    What is a pH of 20 mL of 0.08 M NH3 added to 40 mL of 0.04 M HCl? NH3 + HCl = NH4+ + Cl- c(NH3)=(0.02L * 0.08M)/0.06L= 0.02667 M c(HCl)=(0.04L * 0.04M)/0.06L= 0.02667 M c(NH4+)=c(HCl) Kb=[NH4+][OH-]/[NH3] Kb=1.76*10^(-5) So i tried to calculate it like

    asked by Gloria on September 2, 2013
  62. Analytical chemistry

    a .2280g sample contained only NaCl and KBr. it was dissolved in water and titrated with a 0.04799M of AgNO3. complete titration of both halides was found to require 51.27mL of the AgNO3 solution. Calculate the weight percent of Cl in the solid sample.

    asked by Lana on April 7, 2013
  63. analytical chemistry

    why should EDTA solution be stored in polyethylene container?

    asked by lorraine on August 1, 2010
  64. analytical chemistry

    Calculate the concentration of the initial nitrate stock solution (in ppm) if exactly 0.361 g of KNO3 is dissolved in a 1 L volumetric flask with distilled water.

    asked by Angel on September 21, 2016
  65. analytical chemistry

    0.100 M NaOH (in the burette) is titrated with 25.0 mL 0.120 M CH3COOH (pKa = 4.75) in a conical flask. Determine the pH of the solution in the flask after 10 mL of the NaOH has been added.

    asked by TaeRa on April 2, 2016
  66. Analytical Chemistry

    I have a 0.00156 M solution of CuSO4*5H2O in water (from 0.0398 g of CuSO4*5H20 in 100 mL of water). How would I calculate the ppm of Cu of that solution from that information? Now if I were to find ppm of Cu in different aliquots of this stock solution (5

    asked by Ronnie on November 16, 2015
  67. analytical chemistry

    Adding 10.0 mL of 0.500 M HCl to 100.0 mL of pH = 7 water produces a solution with a pH of 1.34. What is the pH of the resulting solution when 10.0 mL of 0.500 M HCl is added to 100.0 mL of the buffer solution in the introductory example? That buffer

    asked by simona on November 17, 2014
  68. analytical chemistry

    your lab possesses a stock solution of NaOH whose concentration is approx. 0.1M. you prepare a secondary solution by diluting 15.00mL of this stock solution to a total volume of 250.0 mL. you titrate a 50.00mL aliquot of the secondary solution with a

    asked by holly on February 21, 2013
  69. Analytical Chemistry

    Just curious: The melting point of pure benzoic acid and pure naphthol are 122.5 *C and 123 *C respectively. You are given a pure sample that is known to be either pure benzoic acid or 2- naphthol. Describe a procedure you will use to determine the

    asked by Anonymous on January 17, 2019
  70. Analytical Chemistry

    For a triprotic acid H2PO4. Ka1=7.11e-3, Ka2=6.32e-8 and Ka3=7.1e-13. 50mL each of 0.05F CaCl2 and 0.05F phosphoric acid were mixed. Ksp CaHPO4=2.6e-7. a) Would CaHPO4 precipitate when phosphoric acid and calcium chloride were mixed together? b) List all

    asked by Mia on March 24, 2015
  71. ANALYTICAL CHEMISTRY

    A 24-h urine specimen was diluted to 2.000L and buffered to pH 10.0. A 10.00 mL aliquot was titrated with 27.32 mL of 0.003960 M EDTA. The calcium in a second 10.00 mL aliquot was iso;ated as solid CaC2O4, redissolved and titrated with 12.21 mL of the EDTA

    asked by Anonymous on November 20, 2013
  72. Analytical Chemistry

    I need to prepare a standard iron solution by dissolving an appropriate mass of solid Fe(NH4)2(SO4)2*6H2O in water in a 1L volumetric flask containing 1 ml of 96 wt% H2SO4. The final concentration should be ~40mg/L. How would I calculate the this?

    asked by Ryan on April 19, 2011
  73. Analytical Chemistry

    1. If the unknown solid were not dried before analysis, would the calculated percent of KHP be too high or too low? Explain

    asked by Mia on February 9, 2017
  74. Analytical chemistry

    Calculate the expected concentrations of vitamin B6 and caffeine in the stock solution assuming exactly 0.0506 g of pyridoxine hydrochloride (vitamin B6) and 0.1253 g of caffeine are dissolved in a 100 mL volumetric flask.

    asked by Angel on November 23, 2016
  75. Analytical Chemistry

    Calculate the hydroxide concentration of a solution that is 0.1 F with NH3, and 0.25 F in respect to (NH4)2S04.

    asked by juni on September 4, 2016
  76. Analytical chemistry

    an 0.5031 gram sample of iron ore is determined through redox titration using K2Cr2O7. The sample was dissolved in HCl and all the iron was converted to the 2+ state. Titration to the endpoint required 24.34 mL of 0.01887 mol/L K2Cr2O7. Calculate the

    asked by Sam on April 9, 2016
  77. Analytical Chemistry

    5mL of a solution A (unknown concentration) was transferred into sic 25mL volumetric flask. The following volumes of a standard solution of A with with a concentration 75ppm were added to the flask: 0mL, 0.5mL, 1mL, 1.5mL, 2mL, and 2.5L. The excitation

    asked by Katy on May 8, 2015
  78. analytical chemistry

    You are asked to make a 0.3M CaCl2 solution in a flask that can hold 200 ml. How would you do it?

    asked by MJ on February 15, 2014
  79. Analytical chemistry

    A water sample was analysed using a sodium selective electrode. The electrode response was 75.0 mV. A 10.00 mL aliquot of standard 0.50 mmol/L NaCl solution was added to 10.00 mL of water sample. The well-mixed solution gave a response of 98.0 mV. What is

    asked by RC on August 12, 2013
  80. Analytical Chemistry

    A solution prepared by mixing 51.4 mL of 0.340 M AgNO3 and 51.4 mL of 0.340 M TlNO3 was titrated with 0.680 M NaBr in a cell containing a silver indicator electrode and a reference electrode of constant potential 0.175 V. The reference electrode is

    asked by Micki on April 11, 2013
  81. analytical chemistry

    Calculate the volume (mL) of 2.81 M magnesium phosphate solution require to prepare 43.20 mL of 2.1000 %w/v solution of Mg3(PO4)2 . [Answer in 3 decimal places].

    asked by donald on February 15, 2012
  82. Analytical Chemistry

    What is the balanced equation for oxidation of iodide ion by oxygen (O2) that occurs which produces iodine.

    asked by kalynn on January 30, 2012
  83. Analytical Chemistry

    How do I find the mass of KHP? 0.5050 grams of KHP was used and placed into a 250mL volumetric flask and diluted to the mark with distilled water. 50.00mL of this KHP solution was placed in a 250mL beaker. It took 14.75mL of 0.0067M of NaOH to reach the

    asked by Linda on July 20, 2011
  84. Analytical Chemistry

    Hi. We performed an experiment on UV-Vis Spectrometry, by testing the absorbance of KMnO4 and KCr2O7 solutions at different concentrations. We prepared the dichromate solutions with dilute sulfuric acid. Why didn't we use water, what is the purpose of

    asked by Amie on April 15, 2011
  85. Analytical chemistry

    a solution of 0.010M K2Cr2O7 with a volume of 60.00ml reacts in a titration reaction with 20.00ml of FeSO4 in sulphuric acid. Calculate the normality of FeSO4.

    asked by Te'ryam on February 20, 2018
  86. Analytical chemistry

    0.6140 grams of sodium phosphate (Na3PO4) was dissolved in 2 L of water to make a stock solution. 34 mL of this solution is then diluted to 100mL volumetrically to prepare the final solution. Calculate the molarity of phosphate ions in this solution.

    asked by Sam on October 2, 2016
  87. analytical chemistry

    At what ph will Al(OH)3 begin to preciptate from a .10 M solution of AlCl3?

    asked by TK on October 27, 2015
  88. analytical chemistry

    What volume (in liters) of 0.96 M KOH solution should be added to a 0.130 L solution containing 10.2 g of glutamic acid hydrochloride (Glu, FW=183.59; pKa1=2.23, pKa2 =4.42, pKa3=9.95) to get to pH 9.90?

    asked by joi on March 27, 2014
  89. Analytical Chemistry

    25.0 mL of a 0.1067 M Solution of nickel (II) sulfate is diluted to 250 mL with water. 10 mL of this solution is taken and diluted to 1.0 L. Calculate the concentration of [Ni2+] in the final solution in ppm.

    asked by Anonymous on February 11, 2014
  90. Analytical chemistry

    A Kjeldahl analysis was preformed upon a 0.055 g sample of impure biguanide (C2H7N5, fw=101.1). The liberated ammonia, collected in 40 mL of 4% boric acid was titrated with 19.51 mL of 0.1060 M HCl. Calculate the percentage of biguanide in the sample.

    asked by Gloria on August 1, 2013
  91. analytical chemistry

    Shown below is a diagram of an electrochemical cell. Write the shorthand, or schematic, notation for this cell

    asked by yara on May 4, 2013
  92. Analytical Chemistry

    A solution prepared by mixing 51.4 mL of 0.340 M AgNO3 and 51.4 mL of 0.340 M TlNO3 was titrated with 0.680 M NaBr in a cell containing a silver indicator electrode and a reference electrode of constant potential 0.175 V. The reference electrode is

    asked by Micki on April 11, 2013
  93. analytical chemistry

    a 0.120 ml portion of a 50.0% (w/w) KOH solution having a density of 1.50*10^3 g/l is diluted to 250 ml. What is the pH of the resulting solution?

    asked by lolo on March 30, 2013
  94. Analytical Chemistry

    Serum taken from a patient being treated with lithium for manic-depressive illness was analyzed for lithium concentration. A reading of 291 units was obtained for the intensity of the 671 nm red emission line. Then 1.00 mL of a 11.7 mM Lithium standard was

    asked by Brian on March 5, 2013
  95. analytical chemistry

    How much ammonium sulfate should be added to 500mL of .30M ammonia to make a buffer with a pH 9.0?

    asked by joey on November 20, 2010
  96. Analytical chemistry

    A solution is created using 2.1700 grams of Calcium Hydroxide (MW is 74.093) in a 1L volumetric flask. A 50 mL aliquot is then taken and aded to a 350 mL volumteric flask and filled to the line. Finally, a 10 aliquot of the that solution is taken and added

    asked by Sam on October 2, 2016
  97. analytical chemistry

    Consider a general reaction where a ligand L and a metal ion Mn+ form a complex with m number of ligands (L) coordinated to each metal ions. Assume the metal is colorless. The ligand and metal solutions were mixed at molar fractions (and same total molar

    asked by Katy on April 25, 2015
  98. Analytical Chemistry

    Serum taken from a patient being treated with lithium for manic-depressive illness was analyzed for lithium concentration. A reading of 3.00xE2 units was obtained for the intensity of the 671 nM red emission line. Then 1.00 mL of a 11.8 mM Lithium standard

    asked by teresmajor16 on April 7, 2015
  99. analytical chemistry

    Determine the concentration of iron in an aqueous solution containing 0.2810 grams of Fe(NH4)2(SO4)2 per liter of solution. Express the concentration in mg/dl.

    asked by jenine on June 15, 2014
  100. analytical chemistry

    A solution containing both Fe 3+ and Al 3+ can be selectively analyzed for Fe 3+ by buffering to a pH of 2 and titrating with EDTA. Th e pH of the solution is then raised to 5 and an excess of EDTA added, resulting in the formation of the Al 3+ - EDTA

    asked by jody on May 4, 2013

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