A 10.0mL (10.0g) sample of blood was found to contain lead at a concentration of 0.5ppm. What mass of lead was contained in the blood sample? (report answer in scientific notation) Please show the breakdown of how to do the problem as I get confused when steps aren't explained. Thank you!
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A 10.0mL (10.0g) sample of blood was found to contain lead at a concentration of 0.5ppm. What mass of lead was contained in the blood sample? (report answer in scientific notation) Please show the breakdown of how to do the problem as I get confused when steps aren't explained. Thank you!
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- Please answer as soon as possible. Thank you! A 10.000-g cocoa powder sample was dissolved in concentrated acid and then diluted to 100.00 mL using distilled water. The solution was found to contain 5.45 uM Fe. Calculate concentration of Fe (MM: 55.845) in the cocoa powder sample in parts-per-million (ppm) (weight by volume).A solution of Ca(OH)2 (FM = 74.09) was used in determining the equivalent weight of an unknown acid. To do so, the said solution was standardized against 0.1235 g KHP (FM = 204.22), requiring 7.45 mL to reach the phenolphthalein endpoint. On the other hand, a 0.0543 g unknown acid requires 12.85 mL standard Ca(OH)2 to reach the desired endpoint.a. Calculate the standard normality of Ca(OH)2.b. Calculate the equivalent weight of the unknown acid.c. From the information in the table, what is the most probable identity of the unknown acid?A student determined the concertration of NaOCI in a commercial bleach sample using the same technique described in section "F" of the Halogens and Their Compounds lab. The student required 18 drops of 0.01M Na25203 to reach the end point. What is the concentration (reported in percentage) of NaOCI in the bleach sample?
- Suppose you are given 0.0856ppm to be the concentration of dissolved lead found in pond water after dilution factor of 1:100 in 100ml volumetric flask and the other sample is diluted at the dilution factor of 1:2 and the concentration is 2.14ppm. How would you comment on the amount of lead in pond waterAn unknown sample of Cu2+gave an absorbance of 0.262. Then 1.00 mL of solution containing 100 ppm (ug/mL)Cu2+was mixed with 95.0 mL of the unknown and the mixture was diluted to 100 mL in a volumetric flask with deionized water. The absorbanceof the new solution was 0.500. a.Denoting the initial unknown concentrationas [Cu2+]i,write an expression for the final concentrationafter dilution [Cu2+] b.Find [Cu2+]in the unknown.-The density of aluminum is 2.70 g/cm'. Calculate the thickness of a rectangular sheetof aluminum foil with a width of 11.5 cm, a length of 14.0 cm, and a mass of 2.04 g. -Examine your results from your data table in Part 3. Do you have any values for thedensity of the salt solution that lie OUTSIDE the range (& 2s)? If so, list them here: Recalculate & by omitting values that lie OUTSIDE the range. This is the density valueyou should use to determine your experimental % NaCl. part 3 data table included
- SCE students measured the concentration of HCl in a solution by titrating with different indicators to find the end point.Indicator Mean HCl concentration (M)(± standard deviation)Number of measurementsBromothymol blue 0.09565 ± 0.00225 28Methyl red 0.08686 ± 0.00098 18Bromocresol green 0.08641 ± 0.00113 29Is the difference between indicators 1 and 2 significant at the 95% confidence level? Answer the same question for indicators 2 and 3Cedrick and Astrid a 20.00 ml aliquot of grapefruit juice with a 0.165 M NaOH solution to the end point. The initail buret reading was 1.72ml and final buret reading was 15.51ml. They calculated that there was 0.1457g of citric acid present in the juice sample. What is the amount mg of citric acid present per ml of juice? the answer is 7.29mg/ml. (can you please show me how to calculate this answer)Calculate the eq per liter of 0.321g Na2CO3Na2CO3 when it is mixed in a 250ml solution.(MM Na2CO3= 105.78) Report your answer to 3 significant figures. Do not include the unit when writing your answer.
- For 0.250 L of aqueous solution with a density of 1.00 g/mL containing 13.7 mg of pesticide, express the concentration of pesticide in ppm and ppb.A phlebotomist was acting as an instructor for a phlebotomy student from the local college and was anxious to help her learn all the special tests that had not been practiced in class. When a stat blood culture and electrolytes were ordered on a patient in the ICU, the instructor quickly grabbed the student and they headed for the floor. It was clear after looking at the patient that they would have to use a butterfly in a hand vein to collect the test specimen. The instructor was busy helping the student prepare the site and did not pay attention to the order the student layout all of the equipment/tubes/bottles for the draw. The student elated that she was able to access the difficult vein and that blood was flowing freely to the anaerobic bottles. After filling both it and the aerobic bottle to the proper level, she proceeded to draw a sst tube for the electrolytes. The blood flow was now very slow, with blood entering the tube one drop at a time. After patiently waiting for the…1. A solution contains a mixture of Na2CO3 and NaOH. Using phenolphthalein indicator 25 mL of mixture required 19.5 mL of 0.995 M HCl for the endpoint. With methyl orange, 25 mL of solution required 25 mL of the same HCl for the endpoint. Calculate grams per liter of Na2CO3 in the mixture. a.23b.36 c.78 d.112. A 1.2040 g sample containing sodium carbonate and inert material was dissolved in water and titrated to methyl orange end point, requiring 32.50 mL of 0.1020 M HCl. Calculate the %Na2CO4 in the sample. a. 93.36% b. 14.59% c. 12.75% d. 23.41%3. A 0.1510 g KHP (MW = 204.22 g/mol) sample required a volume of 57.04 mL of NaOH solution to reach a phenolphthalein end point. Calculate the molarity of NaOH titrant. a. 0.02593 M b. 0.006481 M c. 0.01296 M d. 0.01012 M