Chemistry concepts and calculations

2. An approximately 0.1 M NaOH solution was standardized with KHP by titration t

2. An approximately 0.1 M NaOH solution was standardized with KHP by titration to a phenolphthalein endpoint. From the following data, calculate the average molarity of the NaOH. …

2. An aqueous HCI solution has the concentration of 0.037 M a) The Hy0\') of thi

2. An aqueous HCI solution has the concentration of 0.037 M a) The Hy0') of this solution ia b) The concentraion of particles in this solution is c) What is the (OH'] of this solu…

2. An aqueous solution containing 0.1 g/L pyruvic acid (CH3COCOOH) is separated

2. An aqueous solution containing 0.1 g/L pyruvic acid (CH3COCOOH) is separated from pure water by a membrane permeable to water, all at 25 degree C. i. Calculate the osmotic pres…

2. An aqueous solution of a salt (one cation and one anion) is thought to contai

2. An aqueous solution of a salt (one cation and one anion) is thought to contain the Group III metal cation Mn^+2. To test this hypothesis, a student added H2S in NH3/ NH4Cl buff…

2. An environmental chemist is investigating a report of ground water contaminat

2. An environmental chemist is investigating a report of ground water contamination. A 50 mL sample was taken from the suspected water. The sample was analyzed and found to contai…

2. An environmental chemist is investigating a report of ground water contaminat

2. An environmental chemist is investigating a report of ground water contamination. A 50 mL sample was taken from the suspected water. The sample was analyzed and found to contai…

2. An environmental watchdog group thinks that a particular mining operation is

2. An environmental watchdog group thinks that a particular mining operation is not adequately removing trace metals from the processing water before releasing it back into the ad…

2. An industrial electrolytic process for producing aluminum uses the reactions

2. An industrial electrolytic process for producing aluminum uses the reactions shown in the following equations. Anode (oxidation): C(s) + 2 O2–(aq) CO2(g) + 4 e– Cathode (reduct…

2. An iron ore was analyzed by dissolving a 1.1324 g sample in concentrated HCI.

2. An iron ore was analyzed by dissolving a 1.1324 g sample in concentrated HCI. The resulting solution was diluted with water, and the iron(III) was precipitated as the hydrous F…

2. An unknown containing cations from Group I was treated with HCI. A white prec

2. An unknown containing cations from Group I was treated with HCI. A white precipitate formed, which appeared to be completely insoluble in hot water. The precipitate dissolved c…

2. An unknown sample of Na2CO3 sample (mass 0.3412 g) is dissolved in distilled

2. An unknown sample of Na2CO3 sample (mass 0.3412 g) is dissolved in distilled water and reacted with exactly 50.00 mL of standardized 0.09983 M HCl solution. The reaction mixtur…

2. An unknown sample of Na2CO3 sample (mass 0.3412 g) is dissolved in distilled

2. An unknown sample of Na2CO3 sample (mass 0.3412 g) is dissolved in distilled water and reacted with exactly 50.00 mL of standardized 0.09983 M HCl solution. The reaction mixtur…

2. Analog to Digital Conversion ICC-12 (by using chip M68HC12) In this lab you w

2. Analog to Digital Conversion ICC-12 (by using chip M68HC12)      In this lab you will use the potentiometers (pots) provided as the source of analog parameters. The two end pin…

2. Analysis of a Mixture of Permanent Gases: Neon Ne- 20.18, Argon Ar 39.95 Oxyg

2. Analysis of a Mixture of Permanent Gases: Neon Ne- 20.18, Argon Ar 39.95 Oxygen 02 31.99, Nitrogen N2 28 Methane = CH4 ( 16.01 ), Carbon monoxide (CO) Indicate the approximate …

2. And just because it\'s an interesting bit of trivia...A number of my former s

2. And just because it's an interesting bit of trivia...A number of my former students have gone on to take the MCAT and then have gone on to medical schools. All of them have com…

2. Anna the Analyst obtained a sample of a very cold liquid. By performing a mas

2. Anna the Analyst obtained a sample of a very cold liquid. By performing a mass spectrometry measurement, she determined that the liquid contained only nitrogen and helium, but …

2. Answer the follo to keep the PV/nT ratio constant. (a) If a gas in a sealed j

2. Answer the follo to keep the PV/nT ratio constant. (a) If a gas in a sealed jar (V constant) is wing questions by identifying how quantities in the Ideal Gas Law change large i…

2. Answer the following questions about Fe and Al compounds. (a) Fe,0,o) and Al,

2. Answer the following questions about Fe and Al compounds. (a) Fe,0,o) and Al,0,0) have similar chemical properties, some simallat similar lattice energies. Give two reasoes why…

2. Answer the following questions about acetylsalicylic acid, the active ingredi

2. Answer the following questions about acetylsalicylic acid, the active ingredient in aspirin. (a) A solution containing 0.955 grams of an unknown compound is vaporized in a 450.…

2. Apply the bisection routine bisect(?) to find the root of the function f(x) =

2. Apply the bisection routine bisect(?) to find the root of the function f(x) = root x - 1.1 starting from the interval [0, 2] (that is a = 0 and b = 2), with tot = 1.e - 8. (a) …

2. Aqueous 50.5 % (w/w) sodium hydroxide has a density of 1.53 g cm-3 (a) Show t

2. Aqueous 50.5 % (w/w) sodium hydroxide has a density of 1.53 g cm-3 (a) Show that 50.5 % (w/w) sodium hydroxide is equivalent to a molar concentration of 19.3 mol dm3 4 marks] (…

2. As you probably know, natural potassium, which we consume every day, contains

2. As you probably know, natural potassium, which we consume every day, contains small amounts of 4°K. Assume you have the following breakfast: a few dried apricots, a banana, a g…

2. As you probably know, natural potassium, which we consume every day, contains

2. As you probably know, natural potassium, which we consume every day, contains small amounts of 4°K. Assume you have the following breakfast: a few dried apricots, a banana, a g…

2. Assume that a deep groundwater aquifer and a lake have been polluted to the s

2. Assume that a deep groundwater aquifer and a lake have been polluted to the same degree. In each the source of the pollution no longer exists, and so no new pollution is enteri…

2. Assume that both acetylsalicylic acid and acetanilide are soluble in propanol

2. Assume that both acetylsalicylic acid and acetanilide are soluble in propanol, and that propanol was used in place of the methylene chloride. What problem(s) might occur during…

2. Assume that you did not rinse the graduated cylinder with your unknown before

2. Assume that you did not rinse the graduated cylinder with your unknown before filling it with 24 mL of the salt solution in Part IIA. The graduated cylinder was only rinsed wit…

2. Assume that you have 20.00 mL of 0.1000 M dimethylamine (pKb = 3.230) in an E

2. Assume that you have 20.00 mL of 0.1000 M dimethylamine (pKb = 3.230) in an Erlenmeyer flask and you titrated with 0.15000 M strong acid or base. Answer the following questions…

2. Assume that you mixed 20.00 mL of 0.040 M KI with 20.00 mL of 0.060 M (NH4)2S

2. Assume that you mixed 20.00 mL of 0.040 M KI with 20.00 mL of 0.060 M (NH4)2S20s 1000 mL of 0.00070M Na2s203 and a few drops of starch. The point of mixing sets time 0. mixing …

2. Assuming air an ideal gas, calculate the entropy change when 1 mole of air is

2. Assuming air an ideal gas, calculate the entropy change when 1 mole of air is heated and expanded from 25°C and 1 bar to 100°C and 0.5 bar. Hint: Heat capacity for air is not c…

2. At this point, measure a volume of vinegar, between 5.0 -6.0 cups, convert th

2. At this point, measure a volume of vinegar, between 5.0 -6.0 cups, convert this to milliliters. Show all your work in your notebook. But wait, it vinegar is 5% v/v volume solut…

2. At this point, you have completed many titrations (probably more than you wou

2. At this point, you have completed many titrations (probably more than you would have liked). You know they can be both precise and accurate. There are currently available many …

2. Based on EC book Chapter 7, Exercise 1 (E1) in page 342: Please try to write

2. Based on EC book Chapter 7, Exercise 1 (E1) in page 342: Please try to write a brief report of about 200 words to evaluate the overall clarity of the privacy statement. You don…

2. Based on moles of O2 evolved, calculate the molar concentration of the origin

2. Based on moles of O2 evolved, calculate the molar concentration of the original 3% H2O2 solution (show calculations) The Barometric pressure was given to us from our TA in Lab,…

2. Based on properties of weak acid/base ions, on the lines to the left of each

2. Based on properties of weak acid/base ions, on the lines to the left of each lettered salt solution identify the type of hydrolysis, acidic (A) or basic (B), that each salt und…

2. Based on the data of standard enthalpy of formation and standard wu that thes

2. Based on the data of standard enthalpy of formation and standard wu that these thermodynamic quantities are independent of temperalE Substance BCl (8) mlar entropy of compounds…

2. Batch reactor: A mixed batch reactor is filled with a uniform suspension of a

2. Batch reactor: A mixed batch reactor is filled with a uniform suspension of aerosol particles that decay and settle out of the air in the reactor due to gravity. If the first o…

2. Because the student added too much nitric acid, he attempted to compensate by

2. Because the student added too much nitric acid, he attempted to compensate by adding more sodium hydroxide, as well. He added 20.0mL of 6.0M NaoH. Was this enough sodium hydrox…

2. Because the student added too much nitric acid, he attempted to compensate by

2. Because the student added too much nitric acid, he attempted to compensate by adding more sodium hydroxide, as well. He added 20.0mL of 6.0M NaoH. Was this enough sodium hydrox…

2. Bench studies have determined that aluminurn sulfote (alum) promotes acceptai

2. Bench studies have determined that aluminurn sulfote (alum) promotes acceptaite floc formation at a dose Of 23 mg/L when applied to a surface water source. Design standards for…

2. Buffer capacity refers to the amount of acid or base a buffer can “absorb” wi

2. Buffer capacity refers to the amount of acid or base a buffer can “absorb” without a significant pH change. It is governed by the concentrations of the conjugate acid and base …

2. Buffer capacity refers to the amount of acid or base a buffer can “absorb” wi

2. Buffer capacity refers to the amount of acid or base a buffer can “absorb” without a significant pH change. It is governed by the concentrations of the conjugate acid and base …

2. Buffers. Physiological pH inside of living cells is about 7.4. The total free

2. Buffers. Physiological pH inside of living cells is about 7.4. The total free concentration of phosphate inside of cells is about 1 mM. Phosphate exists in four different proto…

2. COLORSoF DYES: ELECTRONS INBoxES Cyanine dyes are organic molecules that cont

2. COLORSoF DYES: ELECTRONS INBoxES Cyanine dyes are organic molecules that contain conjugated bonds. This problem deals with one such dye. Its structural formula is shown below. …

2. Calcium and carbon dioxide combine spontaneously @ 298 K under standard state

2. Calcium and carbon dioxide combine spontaneously @ 298 K under standard state conditions (P CO2 = 1atm) to produce calcium carbonate. CaO (s) + CO2 (g) ---> CaCo3 (s) a) Bas…

2. Calcium carbide, CaC2, used to produce acetylene, C2H2, is prepared by heatin

2. Calcium carbide, CaC2, used to produce acetylene, C2H2, is prepared by heating calcium oxide and carbon to high temperature. Carbon monoxide gas is formed as a by-product. a. W…

2. Calcium carbide, CaC2, used to produce acetylene, C2H2, is prepared by heatin

2. Calcium carbide, CaC2, used to produce acetylene, C2H2, is prepared by heating calcium oxide and carbon to high temperature. Carbon monoxide gas is formed as a by-product. a. W…

2. Calcium hypochlorite (Ca(OC)2 Fw 142.983 g/mol) is often used as the source o

2. Calcium hypochlorite (Ca(OC)2 Fw 142.983 g/mol) is often used as the source of the hypochlorite ion (OCI, Fw 51.452 g/mol) in solutions used for water treatment. A student must…

2. Calculate [H3O+]total, [OH-]total, [H3O+]water, [OH-]water, the pH and the pO

2. Calculate [H3O+]total, [OH-]total, [H3O+]water, [OH-]water, the pH and the pOH for a 3.2 x 10-2 M aqueous solution of perchloric acid, HClO4. Compare your value for [H3O+]water…

2. Calculate delta g for the dissolution of urea when 4.4 g of urea dissolved in

2. Calculate delta g for the dissolution of urea when 4.4 g of urea dissolved in 4.7 ml of water at 25 degrees Celsius. R= 8.314 J/mol•k 3. Calculate delta s if delta g = 80.34 kJ…

2. Calculate maximum amount of sodium chloride that can be dissolved in 2.0 g of

2. Calculate maximum amount of sodium chloride that can be dissolved in 2.0 g of water at2 C? (Refer to Figure 5 in the Background section.) 3. Seltzer is a beverage made by disso…