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- What's the differences between two questions? Q1) How much calcium would you ingest by drinking one 8 oz glass of your tap water? Show all calculations. -->Tap water 8Oz = 8 x 0.0296L = 0.2368L Hardness = 66.73ppm = 66.73mg/L CaCO3 1L has 66.73mg CaCO3 0.2368L has 66.73mg x 0.2368 = 15.8017mg MW of CaCO3 = 100g/mol MW of Ca = 40g/mol 100g CaCO3 has 40gf of Ca 15.8017mg CaCO3 has 40/100 x 15.8017mg Ca We would ingest 6.321mg of Ca. Q2) What percentage of the recommended daily dose of calcium (1,150 mg/day) does 1.0 L of your water provide? Show all calculations. --> 66.73mg/1150mg x 100 = 5.80% My Question) Why this calculation is wrong? I think this calculation is same with question 1. Isn't it? CaCO3 = 100g/mol, Ca = 40g/mol 100g CaCO3 has 40g Ca. 66.73 CaCO3 has 40/100 x 66.73mg Ca Ca = 26.70mg 26.70mg/1150mg x 100 = 2.32%On an emergency cart, you have sodium bicarbonate solution (NaHCO3), 44.6 mEq/50 ml. A physician orders an aerosol of 5 cc and 3.25% strength. How many milliliters of the bicarbonate solution do you need? 1 mEq=1/1000 GEW; GEW= gram formula wt/valence Atomic weights: Na, 23; H, 1; C, 12; 0, 166) 100.01 mg Cu(NO3)2 is diluted to 100.00 mL with distilled water. Calculate the ppm of the resulting solution and also calculate the uncertainty of the result. Report the result with the suitable number of significant figures (the uncertainty of 100.00 mL capacity volumetric flask is 0.07 mL, the uncertainty coming from the weighing is 0.05 mg).
- During lab, a student used a Mohr pipet to add the following solutions into a 25 mL volumetric flask. They calculated the final volumes added, which are recorded below. The student then followed the directions in the manual to make the stock solution. Volumes Used to Create Stock Solution Volume 0.200 M Fe(NO3)3 (mL) Volume 0.00200 M KSCN (mL) Stock Solution 9.60 mL 2.55 mL Using the stock solution above, the student made additional dilutions, with the final volumes below. Calculate the concentration of iron(III) thiocyanate ion in Standard 2. For grading purposes, report your answer in mM with four places after the decimal.During lab, a student used a Mohr pipet to add the following solutions into a 25 mL volumetric flask. They calculated the final volumes added, which are recorded below. The student then followed the directions in the manual to make the stock solution. Volumes Used to Create Stock Solution Volume 0.200 M Fe(NO3)3 (mL) Volume 0.00200 M KSCN (mL) Stock Solution 8.99 mL 2.38 mL Using the stock solution above, the student made additional dilutions, with the final volumes below. Calculate the [FeSCN2+] in Standard 2. Report your answer in mM. Volumes Used to Create Standard Solutions Solution Volume Stock solution (mL) Volume Water (mL) Standard 1 7.04 3.47 Standard 2 4.72 5.13 Standard 3 2.71 7.43 Standard 4 1.41 9.14 Note: Reporting your answer in mM is for grading purposes only. It is not necessary during lab. Report your answer to three places after the decimal.How many microliters of a 904.0 ppm Co2+904.0 ppm Co2+ stock solution are required to prepare 20.00 mL20.00 mL of a 19.0 ng/?L Co2+19.0 ng/μL Co2+ solution? Significant figures are graded for this problem. Be sure you do not round your answers until the very end of your calculations.
- MULTIPLE CHOICE: Choose the letter of the best answer Please answer all questions correctly 1. The standardization of volumetric solution does not require hydrochloric acid. A. Permanganometry B. Cerimetry C. Iodimetry D. lodometry E.All of the choices 2. In the standardization of its volumetric solution, the primary standard is dried to constant weight, which means drying shall be continued until two consecutive weighings do not differ by more than 0.50 mg. A. Permanganometry B. Cerimetry C. Iodimetry D. lodometry E.All of the choices 3. In the standardization of its volumetric solution, potassium iodide was added to A. Permanganometry B. Cerimetry C. Iodimetry D. lodometry E.All of the choices 4. Starch is the indicator of choice for these procedures because it forms intense blue coloration with the solution. A. Permanganometry B. Cerimetry C. Iodimetry D. lodometry E. C and D 5. In the standardization of its volumetric solution, the reaction needs to be…The alcohol content of hard liquor is normally given in terms of the “proof,” which is defined as twice the percentage by volume of ethanol (C2H5OH) present. Calculate the number of grams of alcohol present in 1.00 L of 75-proof gin. The density of ethanol is 0.798 g/mL. Round off to 4 sig. figures for all calculations made prior to final answer and the final answer should be in 3 sig. figuresTable of caffeine standards concentration . Sample Conc, ppm Std1 16 Std2 32 Std3 48 Std4 64 Std5 80 If the volume used to make 100 mL of std 1 is 2 uL what is the concentration in M used to make std calibration curve ? The standards are going to be used to build calibration curve to analyze caffeine in an energy drink. if 500 mL of the energy drink has target of 400 mg , how will you prepare the sample if you need 10 mL for the analysis ? Caffeine MM=194.19 g/mol.
- A prescription calls for 150 mL of 0.5 % w/v prednisolone solution. If 4.0 % w/v prednisolone solution will be diluted with water, how many milliliters of water will be needed to prepare the prescription? (Answer must be numeric; no units or commas; round to the nearest 1 decimal place.1. Order: isoproterenol 2 mg in 500 mL D5W to infuse at 15 mL/hrPatient weight: 20 kgHow many mcg/kg/min is the patient receiving? (Round to the 2nd decimal place/hundredth placehe following five beakers, each containing a solution of sodium chloride (NaClNaCl, also known as table salt), were found on a lab shelf: Beaker Contents 1 200. mLmL of 1.50 MM NaClNaCl solution 2 100. mLmL of 3.00 MM NaClNaCl solution 3 150. mLmL of solution containing 25.5 gg of NaClNaCl 4 100. mLmL of solution containing 25.5 gg of NaClNaCl 5 300. mLmL of solution containing 0.450 molmol NaClNaCl Arrange the solutions in order of decreasing concentration. Rank from most concentrated to least concentrated. To rank items as equivalent, overlap them.
