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The epidemiology of the spread of disease through bodily fluids can easily be demonstrated using small cups of water given to several people, one of whose contains the base sodium hydroxide (NaOH) which appears no different than water itself. To simulate interaction of bodily fluids, each person exchanges the liquid in their cup with three other individuals. After the exchange, the indicator phenolthalein is added to each person's cup and the appearance of bright pink indicates that the fluid in their cup was exchanged with the "diseased" fluid containing sodium hydroxide. To complete the demonstration, hydrochloric acid is added to the bright pink cups to simulate "a cure" until the liquid turns clear again.
Explain what chemical reactions occurred, what was the indicator detecting, and why did the color go away after the addition of hydrochloric acid. How does this demonstration relate to the titration performed in the lab?
If 1.35g of AgNO3 is dissolved in 115 mL of water, and to this solution is added 5.00 mL of 1,45M HCl resulting in the formation of a precipitate. Find the concentration of silver ions remaining in the solution.
Calculating concentration of an ion, Given the concentration of hydroxide ions, use the ion product constant of water to calculate the concentration of the other ion at 298 K
A biochemist wants to utilize the following oligopeptide for biochemical assays. Estimate the number of charges on this peptide at different pH conditions by considering the charge states of amino acid residues at pH 2, pH 7.4 and pH 10.
Calculate the molar solubility of thallium chloride in 0.20M NaCl at 25 degrees Celcius. Ksp for TICl is 1.7 x 10 -4. What volume of 0.500 M HNO3 is needed to titrate 60.00 mL of 0.500 M Ca(OH)2 to the equivalence point?
What role does your chemical play in the modern world and what are some possible detrimental health effects that are associated with the chemical you selected?
A solution was prepared by dissolving 0.450 g MgSO4 (FW=120.363g/mol) in 0.500L of water. A 50.0 mL aliquot of this solution consumed 37.60 mL of EDTA solution in a titration. How many milligrams of CaCO3 (FW=100.089g/mol) will react with 1.00 mL ..
A nucleus in an excited state will return to its ground state, emitting a gamma ray in the process. If its mean lifetime in a particular exited state is about 6.35×10-12 s, what is the uncertainty in the energy of the corresponding gamma ray p..
Prepare a table that reports expected values of enzyme velocity (v) at the following substrate concentrations ([s]): 1, 2, 6, 10, 20, 40, 60, 100, 500, 1000, 2400, 5000 (all values are in µM).
solution contains fecl3 0.015 m and naoh 0.010 m. solution of fecl3aq 3naohaq -gt feoh3s 3naclaq gives precipitate
Assign an oxidation state to each element in each compound. Express all answers as a signed integer. 1. Na3PO4 2. Hg2S 3. Fe(CN)3 4. NH4Cl
A stock solution is prepared by adding 24 mL of 0.4 M Na3PO4 to enough water to make 76 mL. What is the PO43- concentration of 25 mL of the stock solution
Three 10.00mL samples of the ascorbic acid solution necessary an average of 25.7mL of titrant for the complete reaction. Compute the mean molarities of the DCP solution
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