Which error will lead to negative deviation from the theoretical Keq? a. cuvette was filled to the brim with the sample. b. cuvette was washed with sodium hydroxide instead of distilled water. C. standard with the highest concentration was used in autozero. d. cuvette was misplaced such that the HO side faces tbe light
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- 49 3. In a preliminary experiment, a solution containing 0.083M X and 0.0666M S gave peak areas of A, = 423 and As = 347. In the analysis of an unknown sample, 10.0 ml of 0.146M S was added to 10,0 ml. of the unknown and the mixture was diluted to 25 ml. in a volumetric flask. Axin the mixture was 553 and As was 582. What is the concentration of X in the unknown?10) 1.0 gram of CaCO3 was dissolved in HCl and the solution was made up to 1000 ml with distilled water. 50 ml of the solution required 45 ml of EDTA solution for titration, 50 ml of hard water sample required 28 ml of EDTA and after boiling and filtering required 15 ml of EDTA solution. Calculate Temporary Hardness. A. 288.6 ppmB. 166.6 ppmC. 88.6ppm 11) Calculate the Permanent Hardness for No. 10 A. 111 ppmB. 222 ppmC. 333 ppm 12) Calculate the Total Hardness for No. 10 A. 421.6 ppmB. 621.6 ppmC. 521.6 ppm1. These are balances that have a maximum loading of 10 to 30 g with a precision of 60.01 mgA. semi-microanalyticalB. MicroanalyticalC. MacrobalancesD. Triple Beam Balance2. Which type of curve is normally produced when plotting the change in the concentration of a specie of some function and the amount of reagent added?A. Titration curveB. Sigmoidal CurveC. Phase Transition curveD. Calibration curve3. In the dead dear case study, silver diethyldithiocarbamateforms a colored solution when it binds with arsenic, what do we call substance like silver diethyldithiocarbamate?A. Secondary standard reagentB. Precipitating agentC. Chelating agentD. Primary standard reagent
- Calculate the average and standard deviations for each solution (and solvent).Ca+2 = 36.8mg/L Mg+2 = 2.9mg/L HCO3 = 98mg/L pH = 7.53 Temp = 9 degree Celsius Calculate the following: a. Hardness in units of mg/L as CaCO3 b. Ionic strength (be sure to include H++ and OH--) c. PCO2 in equilibrium with the sample d. Saturation index with respect to calcite (SIC) e. Saturation index with respect to dolomite (SID)A required characteristic of a primary standard with which we would use to standardize our sodium hydroxide solution is that the primary standard should a. be inexpensive b. have a relatively high molar mass c. be non-hygroscopic d. All of the above.
- 6. The following are disadvantages of using filter paper in gravimetry, which is not included? a. React with strong acids and strong bases b. Break under mild stress c. Ashless filter paper is used d. Prevent use of suction 7. Which of the following can not be used to minimize supersaturation and thus used to crystalline properties? а. Нeating b. Using dilute solutions c. Rapid addition of the precipitating agent d. Air controla. What mass of Ag2SO4 is formed when 34 mL of 0.300 M AgNO3 are mixed with 26 mL of 30.0 g/L Na2SO4? b. Potassium can be determined by flame emission spectrometry (flame photometry) using lithium internal standard. The following data were obtained for standard solutions of KCI and an unknown containing a constant, known amount of Lil as the internal standard. The intensity of a blank was 0.04. Calculate the concentration of K in the unknown. ck, ppm Intensity of K emission Intensity of Li emission 5.0 34.7 5.8 20.0 110.2 9.1 Unknown 57.3 6.8One of the following statements is incorrect: A standard solution should react completely with the analyte with a definite chemical equation A primary standard should be highly pure, has atmospheric stability and absence of hydrated water Back-titration is required when the rate of the reaction slow Standardization is not required when the titrant solution molarity is approximate OTitration error is the difference between equivalence point volume and end point volume
- 15.5 mg of Anthracene was dissolved in 200 mL of cyclohexane to prepare thestock solution. 10 mL of the stock solution was transferred to a 1000 mLvolumetric flask and made up to the mark with cyclohexane. The concentrationof the diluted Anthracene solution was measured by Fluorescence spectroscopyand showed to be 740 ppb. Calculate the % errorA sample is analyzed for chloride by the Volhard method. Calculate the %KCl from the following data: Wt of sample = 0.5000g; Vol of AgNO3 added = 35.00ml; M of AgNO3 = 0.1157; Vol of SCN- used for back titration = 14.71ml; M of SCN- = 0.08598; Atomic wts: Ag = 107.87, N = 14.00, Cl = 35.5, O = 16.00All of the following regarding Argentometric titration are correct except: a. Chromate indicator is used in Mohr's method b. Smaller values of Ksp give sharper break at end point c. Increasing reagent concentration makes the change in pAg larger. d. Volhard's method involves adding excess AgNO, to the analyte, then back titration with standard Fe* solution. e. Fajan's method depends on adsorption of fluorescence indicator on the colloidal precipitate formed