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- A roll of 35-mm black and white photographic film contains about 0.27 g of unexposed AgBr before developing. What mass of Na2S2O35H2O (sodium thiosulfate pent hydrate or hypo) in 1.0 L of developer is required to dissolve the AgBr as Ag(S2O3)23- (Kf=4.71013)?Data Table for Weak Acid Vol. of Titrant pH Avg. Vol. ∆pH/∆vol 0 2.881 0.25 0.622575 0.5 3.193 0.75 0.453769 1 3.420 1.25 0.32668 1.5 3.583 1.75 0.251434 2 3.709 2.25 0.20456 2.5 3.811 2.75 0.173202 3 3.897 3.25 0.150977 3.5 3.973 3.75 0.134517 4 4.040 4.25 0.12191 4.5 4.101 4.75 0.112002 5 4.157 5.25 0.104057 5.5 4.209 5.75 0.097586 6 4.258 6.25 0.092253 6.5 4.304 6.75 0.087819 7 4.348 7.25 0.084111 7.5 4.390 7.75 0.081001 8 4.431 8.25 0.078391 8.5 4.470 8.75 0.076209 9 4.508 9.25 0.074397 9.5 4.545 9.75 0.072912 10 4.582 10.25 0.071719 10.5 4.617 10.75 0.070794 11 4.653 11.25 0.070117 11.5 4.688 11.75 0.069675 12 4.723 12.25 0.06946 12.5 4.757 12.75 0.069467 13 4.792 13.25 0.069696 13.5 4.827 13.75 0.070152 14 4.862 14.25 0.070845 14.5 4.897 14.75 0.071787 15 4.933 15.25 0.072999 15.5 4.970 15.75 0.074507 16 5.007 16.25 0.076346 16.5 5.045 16.75 0.078561 17 5.085 17.25 0.081211 17.5 5.125 17.75 0.084372 18…An unknown sample weighing 0.2583g is titration to the end point with 47.28mL of a 0.10M AgNO3 solution. What is the weight percent of Cl- in the sample?
- 14.7 1. Calculate the solubility of AgI in 0.10 M NaI solution at 25°C. Ksp for AgI is 8.5 × 10-17 at 25°C.A. Why is the titration of the oxalate in the green salt with KMnO4 performed prior to carrying out the redox titration for iron content? (Why can’t you do them the other way – iron first then oxalate?) B. In a titration using 0.02000 M KMnO4 solution, the following data were obtained: Buret readings: FINAL = 15.31 mL INITIAL = 5.02 mL How many moles of KMnO4 were used?What is the concentration of Mn2+ in a solution with an analytical MnY2- concentration of 0.025 M at pH7? Kmny = 6.2 x 1013 a4 = 4.8 x 10-4 A 9.2 × 10-7 M B 8.4 × 10-13 M C 4.0 × 10-16 M D 2.0 × 10-8 M
- A sample is analyzed for chloride by the Volhard method. From the following data, calculate the percentage of chloride present:Weight of sample = 6.0000 g dissolved and diluted to 200 mLAliquot used = 25.00 mL AgNO3 added = 40.00ml of 0.1234MKSCN for back titration = 13.20ml of 0.0930MCalculate the solubility of silver chromate in water: Ag2CrO4 ----------- 2Ag + + CrO42- Express the response in ppm (parts per million) of Ag + (which is the same as µg Ag + / ml). Ks (Ag2CrO4), 1’2 10-12calculate the solubility of Zn(CN)2 at 25°c in a.) 0.250 M NaCN b.) sol'n buffered at a basic pH with complexing agent NH3 αZn = 4.965x10-5αCN- = 0.9841 Ksp of Zn(CN)2 = 8.0x10-16
- Titration of 0.1756 g of primary standard Na2C2O4 (anhydrous) required 32.04 mL of a potassium permanganate solution, calculate the normal concentration of KMnO4 in this solution. Answer: N =How do I find Moles of EDTA required for a complexometric titration of Magnesium if I have the Molarity of EDTA (0.011 M) and the final (35.62 ml) and initial (24.68 ml) readings of EDTA buret?(a) For the precipitation reaction: A+ + B– AB(s)Calculate the value of the equilibrium constant for 99.99% conversion to AB atthe equivalence point, assuming that the analyte content is 5.00 mmole and thetotal volume at the equivalence point is 100.00 mL.(b) What factors affect end-point sharpness in a precipitation titration? Explain.(c) Explain briefly why silver nitrate is an important reagent used in precipitationtitrations.(d) Mohr Method, Volhard Method and Fajans Method are commonly used for thevolumetric analysis of chlorides. Distinguish the three methods in terms of thetitrants and indicators used, and how the titrations are carried out.