10.00 mL of a solution containing calcium iodate was titrated to a starch endpoint with 23.73 mL of 0.02454 M Na2S203. What is the [IO3^-1] in the initial solution? Solve Using string calculation.
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10.00 mL of a solution containing calcium iodate was titrated to a starch endpoint with 23.73 mL of 0.02454 M Na2S203. What is the [IO3^-1] in the initial solution? Solve Using string calculation.
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- A Na2S2O3 titrant was standardized by taking 50.0 mL of 6.7863 x 10-3 M standard KIO3 solution, acidifying, and adding KI crystals. Titration of this solution required 9.80mL to reach the starch endpoint. What is the concentration of the Na2S2O3 titrant?For an insoluble metallic salt, Ksp will always be less than 1. True or False.In the preparation of the standard curve for protein analysis, 50 mn BSA (bovine serum albumin) dissolved in H2O to a final volume of 5 mL was used as stock solution. What is the weight of BSA in 0.1 mL of stock solution? In 0.2 mL?
- Please determine how to make a working standard Solution of about 0.010mg/mL. Caffeine will be the active. Diluent will be water.The stock erythrosine B solution is 8.5 × 10-5 M. Calculate the volume of this solution that you must pipet into a 50-mL volumetric flask, which, when diluted to mark with deionized water, will give a final concentration of 1.7 × 10-5 M. Show your calculation setup.An unknown sample of Cu2+gave an absorbance of 0.262. Then 1.00 mL of solution containing 100 ppm (ug/mL)Cu2+was mixed with 95.0 mL of the unknown and the mixture was diluted to 100 mL in a volumetric flask with deionized water. The absorbanceof the new solution was 0.500. a.Denoting the initial unknown concentrationas [Cu2+]i,write an expression for the final concentrationafter dilution [Cu2+] b.Find [Cu2+]in the unknown.
- (b) Using appropriate chemical reactions for illustration, show how calcium present as the dissolved HCO3- salt in water is easier to remove than other forms of hardness, such as dissolved CaCl2. (c) A water has the following analysis: mg/l mg/l Na+ - 20 Cl- - 40 K+ - 30 HCO3- - 67 Ca2+ - 5 CO32- - 0 Mg2+ - 10 SO42- - 5 Sr2+ -2 NO3- - 10 What is the total hardness, carbonate hardness and noncarbonated hardness in mg/l as CaCO3.1. A 1.2-gram sample of lanolin was treated with Wij’s solution and excess potassium iodide solution. The liberated iodine reacted with 30 ml of 0.1 N sodium thiosulfate solution. If the iodine value was determined as 12.69, what is the volume used in blank titration? 2. A fat sample with combination of acids contain standard hydrochloric acid for blank and sample with 8mL and 5mL respectively. The normality of the standard hydrochloric acid is 0.93N and the weight of the sample is 3 grams. Calculate the saponification value. 3. A 3.50-gram sample of Streptomycin powder was tested for its water content. If the water equivalence factor of the KF reagent was 4.6, what is the percentage water content of the sample if 9.2 ml of the KF reagent was used? 4. A 500mg oil sample is taken from a conical flask and is dissolved in 50mL distilled alcohol. An indicator is added and is then titrated against 0.112N KOH until a slight pink color appears. It took 17.6mL of the titrant to reach the…On the redox titration experiment, Standardization of Na2S2O3 with KIO3 standard solution, what can be replaced KIO3 to make safer solvent and auxiliaries( reduced toxic waste)? explain why?
- Compute the molarity of KMnO4 solution if 1.0092 g of pure FAS required 25.11 mL of KMnO4 solution to reach end point in an acidic medium. An impure sample of FAS weighed 1.2352 g and it required 26.01 mL of KMnO4 solution (use molarity from Q#2) to reach end point in an acidic medium. Compute %Fe in this sample.-The density of aluminum is 2.70 g/cm'. Calculate the thickness of a rectangular sheetof aluminum foil with a width of 11.5 cm, a length of 14.0 cm, and a mass of 2.04 g. -Examine your results from your data table in Part 3. Do you have any values for thedensity of the salt solution that lie OUTSIDE the range (& 2s)? If so, list them here: Recalculate & by omitting values that lie OUTSIDE the range. This is the density valueyou should use to determine your experimental % NaCl. part 3 data table includedA 1.5000-g sample of cereals was analyzed for nitrogen using the Kjeldahl procedure. The receiving flask contained 69 mL of 0.02 M HCl. After the ammonia was collected, the solution was titrated with 0 M NaOH, requiring 11.72 mL to reach the methyl red endpoint. Calculate and percent protein in the sample (f=5.70). Ans. in 3 SFs