Considering only ions with charges of +1, +2, -1 and -2, or neutral atoms, give the symbols for 4 species that are isoelectronic with the sulfide ion, S2-
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30 mols of H2 and 15 Mols of O2 at 20oC are placed in a container at 101.3kPa and react exothermically (okay there is a large explosion but ignoring that) if the walls of the container remove 90% of the energy. The equation for the reaction is 2H2 +O2 ? 2H2O + 241.8kJ, what is the temperature of the water vapour produced (c s =2.01J/gC)
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4) Discuss the sources of sludge and other solids from conventional wastewater treatment systems. Need about 200 words. Please read question thoroughly, cite work and provide references. Course is in industrial and hazardous waste.
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If a solution containing 17.30 g of mercury(II) nitrate is allowed to react completely with a solution containing 5.102 g of sodium sulfate, how many grams of solid precipitate will be formed? BHow many grams of the reactant in excess will remain after the reaction?
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An open tubular column with a diameter of 203 μm and a stationary phase thickness on the inner wall of 0.75 μm passes unretained solute through in 53 s. A particular solute has a retention time of 435 s.
a.) What is the partition coefficient for this solute?
K=_____
b.) What fraction of time does this solute spend in the stationary phase?
Ts/Ttotal=_____
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You mix 100 mL of 1.0 M HCl with 100 mL of 1.0 M NaOH, both initially at 25.0°C, into a coffee-cup calorimeter. The temperature of the reaction raises to 34.2°C. The heat capacity of the coffee-cup is 132 J/°C. What is the heat of the total reaction? What is it per mole of H2O (l) formed?
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For the titration of 20.0 mL of 0.0100 M Sn2 by 0.0500 M Tl3 in 1 M HCl, using Pt and Ag | AgCl electrodes:
for balanced equation
Sn2++Tl3+ --->Sn4++Tl+
with the following two half balanced reactions Sn4++2e- <--->Sn2+ Tl3++2e- <---> TI+
and with two Nernst equations for the cell voltage .The potential for the Ag | AgCl electrode is 0.197 V. E=0.139-0.05916/2 log (Sn2+/Sn4+)-0.197 E=0.77-0.05916/2 log (TI+/TI3+)-0.197
What is the value of E at the following volumes of added Tl3+ ? 1ml, 2ml, 3.90ml,4.0 ml, 4.10ml, 9.0ml.
(please show the work)
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Write a balanced equation for the following:
a) copper (ll) sulfate and aluminum nitrate react to form copper (ll) nitrate and aluminum sulfate
b) phosphoric acid and calcium react to form hydrogen gas and calcium phosphate
c) potassium chloride and calcium fluoride react to form potassium fluoride and calcium chloride
d) hydrochloric acid and sodium hydroxide react to form water and sodium chloride
e) sulfuric acid and iron react to form hydrogen gas and iron (lll) sulfate
f) ethane (C2H6) and oxygen gas react to form carbon dioxide and water
g) phosphoric acid and potassium hydroxide react to form potassium phosphate and water
h) propane (C3H8) and oxygen gas to react to form carbon dioxide and water
i) phosphoric acid and barium hydroxide react to form barium phosphate and water
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Buffers in Medicine The Henderson-Hasselbalch equation relates the pH of a buffer solution to the pKa of its conjugate acid and the ratio of the concentrations of the conjugate base and acid. The equation is important in laboratory work that makes use of buffered solutions, in industrial processes where pH needs to be controlled, and in medicine, where understanding the Henderson-Hasselbalch equation is critical for the control of blood pH. |
Part A As a technician in a large pharmaceutical research firm, you need to produce 250.mL of 1.00 M a phosphate buffer solution of pH = 7.18. The pKa of H2PO4? is 7.21. You have 2.00 L of 1.00 M KH2PO4 solution and 1.50 L of 1.00 M K2HPO4 solution, as well as a carboy of pure distilled H2O. How much 1.00 M KH2PO4 will you need to make this solution? Express your answer numerically in milliliters to three significant figures.
SubmitHintsMy AnswersGive UpReview Part The Henderson-Hasselbalch equation in medicine Carbon dioxide (CO2) and bicarbonate (HCO3?) concentrations in the bloodstream are physiologically controlled to keep blood pH constant at a normal value of 7.4. Physicians use the following modified form of the Henderson-Hasselbalch equation to track changes in blood pH: pH=pKa+log[HCO3?](0.030)(PCO2) where [HCO3?] is given in millimoles/liter and the arterial blood partial pressure of CO2 is given in mmHg. The pKa of carbonic acid is 6.1. Hyperventilation causes a physiological state in which the concentration of CO2 in the bloodstream drops. The drop in the partial pressure of CO2 constricts arteries and reduces blood flow to the brain, causing dizziness or even fainting.Part B If the normal physiological concentration of HCO3? is 24 mM, what is the pH of blood if PCO2 drops to 35.0mmHg ? Express your answer numerically using one decimal place.
SubmitHintsMy AnswersGive UpReview Part |
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in the experiment, a vitamin C tablet was dissolved in water and diluted to 100 ml. A student took 50 ml of solution to titrate. The titration volume of 0.025 M KIO3 (aq) was 15.8 ml. Calculate the ascorbic acid content per tablet. The molar mass of vitamin C is 176 g/mol
IO3- + 5I- + 6H+ = 3I2 + H20 C6H8O6 + I2 = C6H8O6 + 2I- + 2H+
According to the experiment, whihc of the following is correct
a) vitamin c is also called ascorbic acid
b) Iodide ion I- react with stgarch indicator to form the complex
c) Vitamin C is an ionic compound and soluble in water
d) vitamin C is used as a reducing agent
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(HW5-27)
The amount of energy released by burning a fuel source, measured in energy per mass, is called the fuel value. If all the energy obtained from burning 1.27 pounds of butane (fuel value is 10.85 kcal/g) is used to heat 127.5 kg of water at an initial temperature of 18.7 °C, what is the final temperature?
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Which neutral atom is isoelectronic with each of the following ions: Ga3+, Ca2+, Mn7+, K+, Pb2+?
Express your answers as chemical symbols separated by commas.
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Henderson-Hasselback ( please solve using this equation!)
You need to make a 0.1M solution of Glycine (9.4), however your lab is completely out of glycine powder. you do however have 1 liter of 0.1M glycine pH 9 and 1 liter of 0.1M Glcine pH 10. How could you mix these two solutions togther to generate 200ml of your desired solution. pKA of glucine 9.25.
please outline all the steps as clearly as you can.
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