Pre-Lab Exercises 1. What is qualitative analysis used for? 2. What color does potassium impart to a blue flame? 3. Write total ionic equation and net ionic equation for the following reaction. 2 Nal (aq) + Pb(NO3)2 (aq) → Pbl2 (s) + 2 NaNO3(aq)
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- A commercial vinegar was analyzed by titration to determine the percent acetic acid. Briefly, 10.00 mL of vinegar sample was diluted to 100. mL solution in volumetric flask. A 25.00 mL aliquot from the diluted vinegar required 25.55 mL of 0.1005 M NaOH to reach the phenolphthalein endpoint. Which is the correct equation between the analyte and titrant reaction? CH3COOH + NaOH → NaCH3COO + H2O 2CH3COOH + NaOH → NaCH3COO + H2O C20H14O4 + NaOH → NaC20H14O4 + H2O CH3COOH + 2NaOH → NaCH3COO + H2OHow much amount (in grams) do you need to prepare the following solutions 500.0 mL 0.1000 M stock EDTA solution from Na2H2EDTA•2H2O (FW=372.24) and MgCl2•6H2O crystals 100.0 mL 0.0500 M stock Ca2+ solution from pure CaCO3 (FW=100.09) and concentrated HCl 250 mL 1.0 M NH3-NH4+ pH 10 buffer solution from NH4Cl and NH3Consider the below precipitation reaction: Hg2(NO3)2 (aq)+2KIO3 (aq)→Hg2 (IO3)2 (s) + 2KNO3 (aq) A 25.00 mL of 0.04132 M Hg2 (NO3)2 is titrated with 0.05789 M KIO3 The Ksp value of H3 (IO3)2 is 1.3×10-18. Calculate molar concentrations of Hg22+ in the solution after addition of (i) 34.50 mL and (ii) 36.50 mL of KIO3.
- Based on the analysis of a vinegar solution via titration with 0.1 M NaOH. Results are as follows: Trial 1 Volume of vinegar solution used (mL) 5.00 Final burette reading (mL) 44.20 Initial burette reading (mL) 0.00 Determine the percentage mass of acetic acid in vinegar for Trial 1. The density of vinegar is 1.01 g/mL and molecular mass for acetic acid is 60 g/mol.What is the cobalt(II) ion concentration in a solution prepared by mixing 357 mL357 mL of 0.396 M0.396 M cobalt(II) nitrate with 475 mL475 mL of 0.399 M0.399 M sodium hydroxide? The ?spKsp of cobalt(II) hydroxide is 5.92×10−155.92×10−15 .As a food chemist for a major potato chip company, you are responsible for determining the salt content of new potato chip products for the packaging label. The potato chips are seasoned with table salt, NaCl. You weigh out a handful of the chips (78.5 g), boil them in water to extract the salt, and then filter the boiled chips to remove the soggy chip pieces. You then analyze 100.0 mL of the chip filtrate for Cl- concentration using the Mohr method. 1. First, you prepare a solution of AgNO3, and standardize it using 0.500 g KCl as the primary standard. Calculate for the concentration (in M) of the standard AgNO3 solution if it takes 64.5 mL of the AgNO3 titrant to reach the equivalence point of the reaction. Write the balance chemical reaction between the standard and the titrant. 2. You then use the standardized AgNO3 solution to analyze the chip filtrate in a Mohr reaction, finding that the solution yields a rusty brown precipitate when 48.8 mL of titrant is added. Calculate for the…
- Solid cobalt (II) acetate is slowly added to 125 mL of 0.0945 M ammonium chromate solution. What is the concentration of cobalt required to just initiate precipitation? The Ksp of CoCrO4 is 7.1 * 10 -4. Report answer in scientific notation to two sig figs.5 SO2 + 2 MnO4- + H2O ---> 5 SO42- + 2 Mn2+ + 4 H+ The MnO4- solution is poured in a burette and then titrated till the equivalent point is aquired. How many L are needed of MnO4? (the burette starts at 5,7 and is 37,3 after titration)A sample weighing 10.91 g containing an unknown amount of H3PO4 was diluted with water and titrated with a standardized concentration of 0.7255 M NaOH. The endpoint was reached after 27.03 mL of the titrant was added. What is the % H3PO4 (97.994 g/mole) in the sample? H3PO4 + 2 NaOH --> Na2HPO4 + 2H2O ROUND OFF FINAL ANSWER TO FOUR (4) SIG FIGS
- K2Cro4 (aq) + 2AgNO3 (aq) Ag2CrO4 + 2KNO3(aq) how many moles of precipitate could form if 40.0mL of 6.0x10^-2M K2CrO4 solution are mixed with 60.0mL of 3.0x10^-2M silver nitrate solution? If the % yield of the reaction is 80%, what is the actual yield of silver Chromate Ag2CrO4? (show work)The reaction of KOH with HNO2 is presented by the unbalanced chemical reaction below: ___ KOH(aq)+ ___ HNO3 (aq)---> ___ KNO3 (aq)+ ___ H2O(l)Calculate the molar concentration of Nitric acid (HNO2) when 40.5 mL of 0.674 M KOH is required to quench 101.0 mL of Nitric acid over phenolphthalein indicator.Chemistry We complete 10 cm3 to a volume of 0.1 M KBr solution to 30 cm3 and titrate it with 0.05 M Ag+. what is the error of indication if 1.0 cm3 of K2CrO4 solution is used? (molar mass of K2CrO4=194g/mol)