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A volumetric calcium analysis on triplicate samples of the blood serum of a patient believed to be suffering from a hyperparathyroid condition produced the following data: mmol Ca/L = 3.55, 3.65, 3.14. What is the 95% confidence interval for the mean of the data, assuming
(a) No prior information about the precision of the analysis?
(b) s → σ = 0.056 mmol Ca/L?
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- A volumetric calcium analysis on triplicate samples of the blood serum of a patient believed to be suffering from a hyperparathyroid condition produced the following data: mmol Ca/L = 3.15, 3.25, 3.26. What is the 95% confidence interval for the mean of the data, assuming no prior information about the precision of the analysis?(a) Carbon monoxide (CO) is a poisonous gas because it binds very strongly to the oxygen carrier hemoglobin in blood. A concentration of 8.00 × 102 ppm by volume of carbon monoxide is considered lethal to humans. Calculate the volume in liters occupied by carbon monoxide in a room that measures 17.6 m long, 8.80 m wide, and 2.64 m high at this concentration.(b) Prolonged exposure to mercury (Hg) vapor can cause neurological disorders and respiratory problems. For safe air quality control, the concentration of mercury vapor must be under 0.050 mg/m3 . Convert this number to g/L. (c) The general test for type II diabetes is that the blood sugar (glucose) level should be below 120 mg per deciliter (mg/dL). Convert this number to micrograms per milliliter (μg/mL).(2) In the Analytical Chemistry Laboratory Mr.Yahiya Al Moqbali wanted to prepare KCI solution. He has dissolved 2.634 (+0.002) g of KCI in a 250.00 (±0.08) mL volumetric flask. Calculate the molarity of the solution and express your answer with its absolute uncertainty and give reasonable number of significant figure. [The formula mass of KCI is 74.5513 (±0.001) amu] (Show your Calculation)
- The physical fitness of athletes is measured by “VO2 max,”which is the maximum volume of oxygen consumed by anindividual during incremental exercise (for example, on atreadmill). An average male has a VO2 max of 45 mL O2>kgbody mass/min, but a world-class male athlete can have a VO2max reading of 88.0 mL O2>kg body mass/min. (a) Calculatethe volume of oxygen, in mL, consumed in 1 hr by an averageman who weighs 185 lbs and has a VO2 max reading of 47.5mL O2>kg body mass/min. (b) If this man lost 20 lb, exercised,and increased his VO2 max to 65.0 mL O2>kg body mass/min,how many mL of oxygen would he consume in 1 hr?1. (a) A solution of NaCl is prepared by dissolving 0.0056 g NaCl with enough H2O in a volumetric flask to yield a final volume of 10 mL. Assuming a standard (0.1 mg) analytical balance and class A glassware is employed, calculate the concentration of the solution (M) and its corresponding error. The atomic weights of Na and Cl are 22.98976928(2) and 34.45(1), respectively (the number in parentheses indicating the error in the last digit). (b) What would the error be if a 1mL transfer pipet was employed (10x) rather than the 10 mL volumetric flask?Q3)a) Discuss the any two applications of Beer’s law with suitable justification. (b) In an analytical laboratory a chemical compound namely Paracetamol (151.163 g/mol) is determined in a sample. A sample weighing 0.0295 g was dissolved in a solvent and diluted the solution to 1 L. The solution has λ max at 243 nm (ε=2.6×104 cm-1 mol-1 L). The solution exhibits an absorbance of 0.638 in a 2 cm cell. Calculate the percentage paracetamol in the sample. (c) Analyze any two causes of non-linearity of curve in the Beer’s law.
- For answers to calculations, use the correct number of significant figures. The percentage of sodium hydrogen carbonate (NalHCOs, 84.01 gimol) in a powder for stomach upsets is found by titrating with 0.275 M hydrochloric acid (HCI). The balanced equution for the reaction that takes place is NaHCOs(s) + H"(aq)-Na (ag) + cO(g) + H,O) a) If 16.5 mil of hydrochloric acd is required to react with 0.500 g of the sample, what is the percentage by mass of sodium hydrogen carbonate in the sample? ANSWER: % NaHCOs by mass b) The reaction between hydrochlaric acid and sodium hydrogen carbonate is neutralization c) Aside from treating stomach upsets, sodium hydrogen carbonate is also added to make bread dough rise, and commonly placed in refrigerators to remove unwanted odors Its common name is Type 7 to search fom your seved iefoYou determine the acetic acid (HOAc) content of vinegar by titrating with a sodium hydroxide standard solution to a phenolphthalein (an indicator) end point. An approximately 5-mL sample of vinegar is weighed on an analytical balance in a weighing boat and this is found to be 5.0268 g. The standard deviation in making a single weighing is 0.2 mg. The sodium hydroxide must be accurately standardised (this means its concentration must be accurately determined) by titrating known mass of high-purity potassium hydrogen phthalate, and three such titrations give molar concentrations of 0.1167, 0.1163 and 0.1164 mol L-1. A volume of 36.78 mL of sodium hydroxide is used to titrate each sample. The standard deviation of the burette used is 0.02 mL. Calculate the percentage of acetic acid in the vinegar and its standard deviation.A student was asked to determine the concentration of ammonia, a volatile substance, in a commercially available cloudy ammonia solution used for cleaning. First the student pipetted 25.00 mL of the cloudy ammonia solution into a 250.0 mL conical flask. 50.00 mL of 0.100 mol L-¹ HCl(aq) was immed added to the conical flask which reactedwith the ammonia in solution. The excess (unreacted) HC1 was then titrated with 21.50 mL 0. 050 M Na2CO3 (aq). Calculate the concentration of the ammonia in the cloudy ammonia solution.
- For answers to calculations, use the correct number of significant figures. The percentage of sodium hydrogen carbonate (NalHCOs, 84.01 gimol) in a powder for stomach upsets is found by titrating with 0.275 M hydrochloric acid (HCI). The balanced equution for the reaction that takes place is NaHCO,(s) + H"(aq)-Na (ag) + cO(g) + H,O) a) If 16.5 mil of hydrochloric acd is required to react with 0.500 g of the sample, what is the percentage by mass of sodium hydrogen carbonate in the sample? ANSWER: % NaHCOs by mass b) The reaction between hydrochlaric acid and sodium hydrogen carbonate is neutralization c) Aside from treating stomach upsets, sodium hydrogen carbonate is also added to make bread dough rise, and commonly placed in refrigerators to remove unwanted odors Its common name is Type 7 to search fom your seved iefo(a) For use in an iodine titration, you prepare a solution from 0.222 2 (+0.000 2) g of KIO3 [FM 214.001 0 (+0.000 9)] in 50.00 (+0.05) mL. Find the molarity and its uncertainty with an appropriate number of significant figures. (b) Would your answer be affected significantly if the reagent were only 99.9% pure?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)