Dr. TS You found lead in blood collected from children living within 5 km from the Ship Channel. Calculate weighted average lead concentration (mg/L) in their blood. Age group (n) Average lead concentration (ug/dL) 25 1-2 years (30) 34 years (50) 56 years (50) 7-8 years (40) 9-10 years (60) 30 35 40 40
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- A solution is contaminated with traces of cadmium, manganese, and cobalt. Which option would be the safest way to make it safer for human consumption? ksp OH- CO32- S2- Cd2+ 2.5x10-14 1.8x10-14 8x10-28 Mn2+ 1.6x10-13 5.0x10-10 2x10-53 Co2+ 1.3x10-15 1.0x10-10 5x10-22 A bubble carbon dioxide into the water B raise the pH to about 12 C lower the pH to about 2 D increase the sulfide levelA solution is contaminated with traces of copper, nickel, and zinc. Which option would be the safest way to make it safer for human consumption? Ksp OH co,?- s2- Cu2+ 4.8x10-20 2.3x10-10 бх10-37 Ni2+ 6.0x10-16 1.3x10-7 Зx10-20 Zn2+ 3.0x10-16 1.0x10-10 2x10-25 raise the pH to about 12 bubble CO2 into the solution lower the pH about 2 increase the sulfide levelWrite your complete solutions on yellow paper, round your answers to the appropriate number of significant figures, and box the final answer. The deadline for submission is at the end of the class. Note: You do not need to write your solutions for the items that can be derived from your calculators. 1. Three students (Saerom, Hayoung, and Jiwon) are asked to determine the ppm Ca in a drinking water sample by titration with EDTA. Each student performed five trials for the sample. The results in ppm Ca are the following: Saerom Hayoung Jiwon a. Get the mean, SD, and % RSD of each student's results. b. If the true value is 35 ppm, calculate the relative error of each student's results. c. Comment on the precision and accuracy of each student's results. The maximum % RSD and the relative error set by the lab is 5.0%. d. Use the following table to summarize your answers. Mean SD %RSD Relative Error Comment 31, 32, 33, 33, 32 35, 34, 34, 35, 34 35, 38, 33, 35, 37 Saerom Mean SD 95% CI…
- Mercury emitted by industrial activities bioaccumulates in saltwater Tima as methylmer cury. The concentration of methylmercury in canned albacore tuna averages 30 x 10 g / 85 g of tuna. Determine the number of times per year when an individual (both male and female) can safely consume 110 g of canned albacore tuna. The reference dose is RD-1x10 mg/(kg-day).using table 1, answer the questiosn below. Mass of Crushed Antacid (g) .500g Concentration of HCl (M) 1.0 M Volume HCl (mL) 5.01ml Concentration of NaOH (M) 1.0M Initial NaOH Volume (mL) 4.10ml Final NaOH Volume (mL) 2.60ml Total Volume of NaOH Used (mL) 1.5ml HCl available for neutralization (g): Moles of NaOH required to reach stoichiometric point (mol): HCl neutralized by antacid (g): HCl neutralized per gram of antacid (g):In the phosphate analysis of a wastewater sample, 30.00 mL of the original sample was taken and diluted with 120.00 mL deionized water. The diluted sample was found to have a phosphate content of 25.5 ppm. What is the phosphate content (in ppm) of the original wastewater sample? DENSITY VALUES AT 25°C Ethanol: 0.789 g/mL Water: 0.997 g/ml Acetic Acid: 1.05 g/mL
- between 1960 and 2020 the concentration of atmospheric CO2 has increased by approximately? Group of answer choices 100 ppm 320 ppm 400 ppm 420 ppmFor lab 4, we combined baking soda with vinegar, according to the chemical equation NaHCO 3 + CH 3COOH ==== NaCH 3COO + CO 2 + H 2O Consider 3 experiments: (i) 2g baking soda + 5mL vinegar, (ii) 2g baking soda + 10mL vinegar and (iii) 2g baking soda + 20mL vinegar. The amount of CO 2 produced was highest for (iii) and lowest for (i). For these experiments, which of the following is true? Vinegar ran out first Baking soda ran out first They both ran out at the same time Neither ran outA student prepares a 1.2 mM aqueous solution of benzoic acid (C,H,CO,H). Calculate the fraction of benzoic acid that is in the dissociated form in his solution. Express your answer as a percentage. You will probably find some useful data in the ALEKS Data resource. Round your answer to 2 significant digits. 0% DP de M
- For questions 48-55, please refer to the following: In order to form Ba(IO3)2, 500 mL of 0.5000 M Ba(NO3)2 was mixed with 500 mL of 0.0500 M NaIO3. Ksp= 1.57x10^-9 1. How many millimoles of Ba(NO3)2 are there in the solution? 2. How many millimoles of NaIO3 are there in the solution?What is the [H30*] concentration for a solution where [OH] = 2.3 x 103 M? Kw = 1.0 x 1014 = [H3O*][OH] %3D A. 4.3 x 10 12 M B. 1.2 x 10 13 M C. 2.8 x 10 13 M D. 7.9 x 10 12 M E. 4.6 x 103 MA student creates a calibration plot for serial dilutions of Cu(NO3)2. A graph of concentration in M (x-axis) versus absorbance (y-axis) gives a linear trendline of y = 0.345x - 0.11. e.) Copper(II) nitrate has a solubility of 83.5 g in 100 g of water. Calculate the percent error in the student's concentration.