Informal Nickel Lab Chem 3500-02 (3)

Given the following information, calculate the % recovery of copper. Volume of original copper containing solution=20.2ml Concentration of original copper containing solution=25.125 g copper per L Mass of precipitated copper=0.469g

You were assigned to assay a product sample of milk of magnesia. A 0.600-g sample was reacted with 25.00 mL 0.10590 N H2SO4 . The excess unreacted acid in the solution required 13.00 mL of 0.09500 N NaOH when titrated to reach the methyl red end point. Determine the dosage strength of the product in terms of % Mg(OH)2 content. Type your answer in 2 decimal places, numbers only.

What is the normality of a K2Cr2O7 solution prepared by dissolving 5.00 g of K2Cr2O7 in 200 mL of solution, which will be used in the following unbalanced reaction?Cr2O72- + SO32-  Cr3+ + SO42- (in acidic solution)

Part A: Other Redox Reactions in Acidic and Basic Solution. Give a balanced net ionic equation for all six reactions (if possible). please show work.

MasteringChemistry .edu/webapps/assessment/take/launch.jsp?course_assessment_id%3_1575667_1&course_id%3_592130_1&content_id%3D_39106439 18 Up pe Maps M Gmail YouTube O Maps * Question Completion Status: QUESTION 4 A student takes 92 ml of a 0.0245 molar KOH solution and dilutes it to a final volume of 4,314.5. What is the pH of that resultant dilute solution? (report pH to two decimal places and include NO units in your answer) QUESTION 5 A student is told by their chemistry professor that he thinks he remembers that the ion product constant for water (Kw) has a value of 1.51x10-14 provided by their chemistry professor from his questionable memory, what is the calculated pH of water at 40 °C ? (Enter your number with 2 decimal places and do NOT include "pH" as a unit in your answer.) when water has the same temperature as that of a human running a hot fever of 40 °C. Based only on this information QUESTION 6 Given the information for equilibria (1) and (2) below, find the equilibrium…

I just needed help finding the theoretical value. Thank you!

balance C6H12O6+CO2+H2O with explanation

Show all working explaining detailly each step. Answer should be type written using a comuter Keyboard!

The Ce4+ amount in a solid was determined gravimetrically. A 2.178 g sample of the solid was reacted with excess iodate ion to produce Ce(IO3)4(s). The precipitate was collected and prepared for ignition in order to produce CeO2(s). The mass of CeO2 found was 0.3413 g. Calculate the weight percent of Ce in the original solid sample.

Please don't provide handwritten solution .......

Consider the following redox reaction which was conducted under acidic medium to answer this question. x2- M3+ XO M+ + + A 0.122 M Na2X (MM = 78.3) aqueous solution was placed in a buret and titrated against a 1.02 g sample of 75.9% pure MCI3 (MM = 57.5) that had been dissolved in an appropriate amount of acid until the redox indicator changed color. Given this information, how mL of titrant were necessary to completely react with the titrand? Use 3 significant figures to report your answer.

(d) By using the data provided below, calculate the PillingBedworth ratio for the nickel (Ni) – nickel oxide (NiO) system and determine whether NiO is protective against corrosion.  Atomic mass of nickel = 58.7 g.mol-1 Density of nickel = 8.91 Mg.m-3 Molecular mass of nickel oxide = 74.7 g.mol-1  Density of nickel oxide = 6.67 Mg.m-3 (e) A stainless steel pressure vessel that has fracture toughness, K1C, of 197 MN.m-3/2 is going to be exposed to a stress of 398 MN.m-2 . By using this information explain how designers can determine the thickness of the vessel so that catastrophic failure can be avoided.

Copper is in the left beaker and zinc is in the right. Write a description of the macroscopic observations you might expect to see when testing this experimental design. Example attached

) To adjust the thiosulfate (S2O3) solution to be used as a titrant in the copper determination, excess KI was added to exactly 25.0 mL of 5.68 x 103 M KIO3 solution to liberate iodine (12) and 16.4 mL of thiosulfate solution is being consumed in the titration of I2. In this standardization process, the concentration of the thiosulfate solution is calculated. 103 +51 (excess)+ 6H*→ 31z+ 3H2O Iz+ 2S2032→ S402²-+21 Then, for copper determination 25.0 mL of 250 mL copper-aliquots is taken and treated with excess Kl. Cu²++ 21 (excess)→ Cul + % l2 The liberated l2 was titrated with the 8.2 mL of adjusted thiosulfate solution (S2O32). I2+ 2S2032> S4O,²+21- Calculate, how many milligrams of copper is found in the sample? (Cu: 63.5 g/ mol)

For the following reaction 6 experiments have been run and the data collected is in the following table: 2 MnO4-(aq) + 5 H2C2O4 (aq) + 6 H+ (aq) ---> 2 Mn2+ (aq) + 10 CO2 (g) + 8 H2O (l) Experiment [MnO4-], M [H2C2O4], M [H+], M Rate, M/s 1 0.2410 0.3470 0.2690 0.1147 2 0.3260 0.6210 0.2270 0.2776 3 0.5630 0.5740 0.7420 0.4431 4 0.2410 0.3470 0.3840 0.1147 5 0.4140 0.5740 0.5610 0.3258 6 0.3260 0.4930 0.4910 0.2203 a) Find the order of the reaction with respect to H+. _______________ b) Find the order of the reaction with respect to MnO4-. ______________ c) Find the order of the reaction with respect to H2C2O4. _____________ d) What is the overall order of the reaction? ________________________

2 2 points A stock solution of red dye solution is in a reagent hood ready to be used in the reaction. Molarity of red dye stock solution = 2.8 x 10-5 mol/L The experiment is carried out with the following volumes (Vol) of reagents: Vol of dye solution (mL) 2.5 Vol of CIO solution (mL) Vol of deionized water (mL) 10.0 17.5 Total volume of the reaction solution in the test tube is therefore 30.0 mL. The dilution equation is M1V1 = M2V2. What is the concentration of red dye, in units of mol/L, in the reaction mixture (in the test tube) at the start of the reaction? 2.2 × 10-6 mol/L 2.5 x 10-6 mol/L 2.8 x 106 mol/L 2.3 x 10-6 mol/L