This method is to be used when measuring the volume of a solution containing sufficient reagent to react completely with the analyte. Group of answer choices Volumetric Spectroscopic Gravimetric Electroanalytical
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This method is to be used when measuring the volume of a solution containing sufficient reagent to react completely with the analyte.
Group of answer choices
Volumetric
Spectroscopic
Gravimetric
Electroanalytical
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- The air in a recently used classroom 9m x 7m x 9m tested 0.12% carbon dioxide. How many cubic meters of fresh air must be admitted per minute in order that 10 minutes later it shall contain not over 0.06% carbon dioxide. Fresh air contains 0.04% carbon dioxide. Assumeimmediate mixing of fresh with stale air. (A) 14 (B) 11 (C) 15 (D) 19 (E) 17(a) The researchers are requested to prepare a 5.23 mol dm³ of concentration of Sodium Thiosulphate for the laboratory. The researchers have measured the concentration of the solution prepared by using the Sodium Thiosulphate Concentration Monitor. The result of the experiments is shown in Table 1. Table 1 Reading (M) Researcher Equipment Type Average 3 1 АВС-1 4.75 4.98 4.66 4.80 Y АВС-2 5.40 5.20 5.30 5.30 Z АВС-3 3.45 2.58 4.52 3.52 i. Based on the Table 1, conclude the results obtained by the researchers. ii. Define the metrology term: Error. iii. Calculate the error percentage obtained by each researchers.When we make a calibration curve, we want the range of calibration standards to the analyte concentrations in the samples. If this is not the case, we will have to the samples, depending on the analyte concentration. O Exclude, concentrate or dilute O Include, spike O Include, concentrate or dilute None of These O Exclude, calculate the concentration of You have prepared a set of calibration standards for nitrate in surface water where you are using Beer's Law to generate the calibration curve. The calibration equation for the standards you have prepared between 1 and 15 ppm is y = 0.0820x +0.00900. You analyze a 3.00 mL water sample and generate an absorbance response of 1.12. You report the concentration of nitrate in this sample as: O None of These O 4.52 ppm O The concentration is out of range so it cannot be reported O 13.5 ppm O 13.5 absorbance
- What volume, in L, of 0.108M aluminum carbonate solution is needed to react with 35.86g solid potassium hydroxide? A Click Submit to complete this assessment. mm10451 quiz6 2.pdf UI Online - Doc_....pdf AcroRdrDC_210...dmg Chapter 6 study. 2,005 étv W MacBook Air D00 000 F4 DII DD F5 F6 F7 F8The following set of chloride on seperate all quots Of a pette pooled Serum obtaned from SMu chemistry lab here reporterd by (43) students : (03:106; (07 and 114 meqlL. analysis One value qppears suspect. Help these Students to determine if it can be ascribed to the acudental 95% Confidence level. error otTo /bbhosted.cuny.edu/webapps/assessment/take/launch.jsp?course_assessment_id%3_2032634_1&course_ id= 201483.. Remaining Time: 1 hour, 09 minutes, 31 seconds. * Question Completion Status: A student makes a solution by dissolving 25.4 g of NaOH into 450 g of water. What is the mass percent (m/m) concentration of this solution? QUESTION 4 13.9 g Sodium sulfate (Na2SO4) has a solubility of in water at 20 °C. Which of the following mixtures will yield 100 mL a saturated solution at this temperature?. O 0.50 g of Na,SO4 in 1.0 mL of water O 125 g of NazSO4 in 1.0 L of water O 0.50 g NazSO, in 100 mL of water O 4.3 g Na,sO, in 100 mL of water O 17 g of Nazs04 in 0.500 L of water Click Save and Submit to save and submit. Click Save All Answers to save all answers. Save All Answers re to search 50°F Mostly sunn DELL DII home prt sc F10 F1 end inse F3 FS F9 F12 %23 %24 3 4. 5 7 8. Y D R E
- The purpose of digestion process in gravimetric analysis is to: 1. O decrease the particle size of the precipitate 2. O evaporate the solvent 3. O dry the precipitate 4. O coagulate the precipitateThe following data were collected for the reaction 2A + 2B + C 3G+ 4 F Experiment 2 3 4 5 [A] Units of Molarity .00125 .00250 .00125 .00125 .00301 [B] Units of Molarity 00125 .00125 00302 00302 .00100 [C] Units of Molarity 00125 .00125 .00125 00375 .00115 Rate Units M/s 00870 .0174 .0508 .457 a. What is the order with respect to each reactant and what is the overall order for the reaction? Answer this question within the answer box and show your work clearly labeled on the scratch paper. b. Write the rate law for the reaction. Answer this question within the answer box and show your work clearly labeled on the scratch paper. c. What is the value and units for k? Answer this question within the answer box and show your work clearly labeled on the scratch paper. d. Predict the rate for experiment 5, you should give a value and units. Answer this question in the answer box and show your work on the scratch paper labeled clearly.A weight of 0.50 g was taken impure container containing sodium carbonate and bicarbonate. Dissolved in water and then crushed with hydrochloric acid (0.1 N), the burette reading game was at the endpoint of phenolphthalein of 10.5 ml and at the end point of the orange methylation point 30.1 ml. The percentage of sodium carbonate was in ................. knowing that the weights are: Na: 23, C: 12, O: 16
- In the Analytical Chemistry laboratory, one of the B.Sc student Ms. Fatma wanted to analyze the presence of Iron(II) ion in the water samples collected from Sohar Industrial Area in the Sultanate of Oman and analyzed by Spectrophotometric method. (1) 250.00 mL of this water sample (Solution A) known to contain unknown amount of FeSO4. She has diluted Solution A by a dilution factor 10 to make 250.00 mL solution, which she labeled Solution B. Using Spectrophotometer, she has measured the absorbance value (0.642) for Solution B at 508 nm using 1.00 cm cell (cuvet). The molar absorptivity value for Fe2* ion at 508 nm is ɛ508 = 30.8 M-1cm1. (i) What volume of the solution A did she require to make the 250.00 mL of Solution В? (ii) in (i)? What instrument should she use to transfer the volume of the Solution A calculated (ii) Concentration of FeSO4 in Solution B. (iv) Concentration of FeSO4 in Solution A. Mass of FeSO4 in Solution A (Show your calculation) (v)Because of the risk of lead poisoning, the exposure of children to lead-based paint is a significant public health concern. Thefirst step in the quantitative analysis of lead in dried paint chips is to dissolve the sample. Corl evaluated several dissolution techniques.24 In this study, samples of paint were collected and pulverized with a Pyrex mortar and pestle. Replicate portions of the powdered paint were then taken foranalysis. Results for an unknown paint sample and for a standard reference material, in which dissolution wasaccomplished by a 4–6-h digestion with HNO3 on a hot plate, are shown in the following table. (a) Determine the overall variance, the variance due to the method, and the variance due to sampling. (b) What percentage of the overall variance is due to sampling? (c) How might the variance due to sampling be decreased?A clinical chemist obtained the following data for the alcohol content of a sample of blood: % C,H OH: o.084, 0.089, and o.079. Calculate the 95% confi- dence interval for the mean assuming that (a) the three results obtained are the only indication of the precision of the method and that (b), from previous