Q: A 2.86 g magnesium chloride, MgCl2 (MW = 95.211 g/mol) in a 1L solution at 25°C has an osmotic…
A: Weight of magnesium chloride= 2.86g MW of MgCl2=95.211g/mol Volume=1L Osmotic pressure=2.15 atm…
Q: unknown. a. Gas Law: Charles Solve for the Unknown: 295 425 (22+273)K 5.34atm. Gas Law: Boyle's Law…
A:
Q: CH3OCH3
A: Answer : the species that can form hydrogen bond with water are CH3OCH3 and HCOOH . CH3OCH3 makes…
Q: Calculate the pH of an aqueous solution at 25°C that is 6.2x 10 3 M in HI. pH
A:
Q: Calculate the equilibrium constant at 25°C for each equilibrium reaction and comment on the extent…
A:
Q: Gas A has a molar mass 21.8, while gas B has a molar mass 78. How much faster will A effuse? (record…
A: The process of escaping the gas molecule through a very small hole is known as effusion. During…
Q: The rate equation for the reaction A→B + C is expressed in the forms of Rate of disappearance of A =…
A:
Q: Which of the following describe the Integrated rate Law for the 2nd order kinetics? Select one: a.…
A:
Q: Is the transport of Na" ions across a cell membrane spontaneous when [Na"]in/[Na"Jout = 0.10 and…
A: The cell membrane is not very permeable to sodium ions, so they must enter through a process…
Q: How many equivalents of PO43 are there in 6.00 mol of Mg3(PO4)2 ?
A:
Q: Calculate the pH at 25°C of a 0.0047 M solution of a weak base with a K, of 3.5 x 10-9. pH = %3D
A: Answer: Given data: Kb=3.5×10-9C=0.0047M
Q: Answer question in the picture: Also the info you need that in the picture it says refer to ALEKS…
A: For the given redox reaction, 1) The balanced equation for the half reaction takes place at the…
Q: 1. Consider a situation where two volumes of water, one hot, one cold, are both added to a foam cup.…
A: “Since you have posted a question with multiple sub-parts, we will solve the first three subparts…
Q: Hydrazine, N2H4 is used as rocket fuels. The thermochemical equations for the combustion of…
A:
Q: What is the pH of the solution at the equivalence point?
A: Equivalence point :- In acid-base titration the point at which the amount of acid added is exactly…
Q: A chemist carefully measures the amount of heat needed to raise the temperature of a 639.0 g sample…
A:
Q: Consider a buffer solution that is 0.50 M in NH and 0.20 M in NH4Cl. For ammonia, pKp = 4.75.…
A:
Q: The reaction C2H5Cl →C2H4 + HCl is first order in C2H5Cl. The rate constant is 1.60 x 10-6/s. In an…
A:
Q: A student needs to dilute a 0.47 M Pb(NO3)2 solution to make 77.0 mL of 0.22 M Pb(NO3)2. Set up the…
A:
Q: Given : (1) 2NF3 + 2NO → N2F4 + 2ONF ∆H= -82.9 kJ (2) NO + ½ F2 → ONF…
A: Calculate the value of ∆H for the reaction: 2NF3 + Cu → N2F4 + CuF2 ∆H = ?
Q: The rate equation for the reaction A→B + C is expressed in the forms of Rate of disappearance of A =…
A: The reaction : A --> B + C rate of disappearance = - d[A]/dt = k [A]0 , as it is zero order…
Q: rs in Blood 6 of 16 I Review | Constants | Periodic Table Part B At a pH of 7.40, what is the ratio…
A:
Q: Enter your answer in the provided box. A solution is made by dissolving 18.7 g of HCI in enough…
A: Answer: -0.023
Q: 45 The natural catalyst of the organisms is called? Select one: a. Inhibitor b. Poison c. Enzymes…
A: Enzymes are chiral compounds. Enzymes can act as catalyst in the organisms. Enzymes do the one FG to…
Q: 3.5 x 10-8) What is the pH at the equivalence point in the titration of 100.0 mL of 0.0500 M HOCI…
A:
Q: Given the thermochemical equations: 2NaN3 → 2Na + 3N2 ∆H = +42.7 kJ How many grams of…
A: Known: Molar mass of NaN3 = 65.01 g/mol
Q: Reductive FGI C-C BrMg' ammination CI 3 TM
A: We have to give the complete reaction mechanism.
Q: The reaction 2NO(g) + Cl2(g) ---> 2NOCl(g) was performed and the following data obtained: Is…
A: Ans.
Q: The specific heat of lead is 0.129 J / g 0C . How many joules of heat is required to raise the…
A:
Q: bon #1 and #2. Let the carbon #1 containing the methyl group to front while carbon #2 containing the…
A:
Q: . What is the electron configuration of Zn2+ ? Is it paramagnetic diamagnetic? or
A: We have to write the electronic configuration of Zn2+
Q: HNO3 HCI H3CO -C(CH3)3 ? H2SO4 Fe or Sn HS A) H2N- -C(CH3)3 B) H3CO- -C(CH3)3 C) H2N D) H2N H3CO-…
A: Note : Methoxy is electron donating group. Therefore incoming NO2+ electrophile approaches the ortho…
Q: ro students weigh a gelatin capsule (0.112 g). Next they add pieces of aluminum-zinc alloy the…
A:
Q: What is the major product of the following Aldol Condensation reaction? TSOH heat excess o. в. OH C.…
A: ->Carbonyl compound which has alpha hydrogen can form nucleophile in presence of acid and give…
Q: An arctic weather balloon is filled with 44.0 L of helium gas inside a prep shed. The temperature…
A: Given: Initial volume of gas = 44.0 L Initial temperature of gas = 10.0oC Final temperature of gas =…
Q: Calculate the pH of an aqueous solution at 25°C that is 0.28 M in phenol (C&H5OH ). (K, for phenol…
A:
Q: The study of energy changes that accompany chemical and physical changes is known as? Select one: a.…
A: It is not definition of physical chemistry because it is interactions and transformations of…
Q: The rate constant of a certain reaction is known to obey the Arhenius equation, and to have an…
A: Arrhenius equation
Q: A. What is scum? Why would it form in in hard water but not soft water? B. (Synthetic) detergents…
A: Scum : Hard water is having calcium, Mg salts. These salts react with soap and forms insoluble…
Q: 6.1 Is the transport of Na* ions across a cell membrane spontaneous when [Na"]in/[Na*]out = 0.10 and…
A: [Na]in /[Na]out=0.10 An ionic imbalance is present here.
Q: A quantity of 1.922g methanol, CH3OH was burned in bomb calorimeter. Consequently, the temperature…
A: Given:The amount of methanol is 1.922 g The change in temperature is 4.20oC The heat capacity of the…
Q: The equilbrium constant, K, for the fellowing reaction is 1.20x10 at 50K An equlibrium misture of…
A: The equilibrium reaction given is PCl5 (g) ⇌ PCl3 (g) + Cl2 (g) The equilibrium constant (K) for the…
Q: Exercise 24. Which of the following SN reactions will take place? 1. NH2 NH2 2. HO- -F OH- 3. CN + I…
A: 1. NH2- is bad leaving group. Therefore no reaction. 2. OH- is bad leaving group. Therefore no…
Q: A gas occupies a volume of 4.50 L at 760.0 mmHg at a temperature of 25°C. What would be the new…
A: Given, The volume of a gas at 760.0 mmHg pressure is 4.50 L, the volume of a gas at 200.0 mmHg…
Q: Given the thermochemical equations: 2NaN3 → 2Na + 3N2 ∆H = +42.7 kJ How many grams of…
A:
Q: if i have 35 L of a 3.0 M Na2SO4 solution and what was my concentration when at 750 L solution ?
A:
Q: alculate to three significant digits the density of carbon dioxide gas at exactly 30 °C and exactly…
A: Ideal gas equation is:- PV = nRT Where P = pressure = 1 atm T = temperature = 30° C = 303 k V =…
Q: A mixture of gaseous reactants is put into a cylinder, where a chemical reaction turns them into…
A: It is given that 214 kJ of heat flows out of the system, thus the reaction is exothermic. As heat…
Q: The following data was obtained from the reaction: (a) Determine the rate law. (b) Calculate…
A: Rate can be expressed as:- Rate = K [NO2 - ]n[NH4 +]m Where n and m is order of reaction.
Q: The reaction C2H5Cl →C2H4 + HCl is first order in C2H5Cl. The rate constant is 1.60 x 10-6/s. In an…
A: We have to predict the concentration after given time.
- Enumerate at least 2 specific biological applications of precipitation titration and discuss each.
Step by step
Solved in 2 steps
- As part of a soil analysis on a plot of land, a scientist wants to determine the ammonium content using gravimetric analysis with sodium tetraphenylborate, Na+B(C6H5)4−. Unfortunately, the amount of potassium, which also precipitates with sodium tetraphenylborate, is non‑negligible and must be accounted for in the analysis. Assume that all potassium in the soil is present as K2CO3 and all ammonium is present as NH4Cl. A 5.095 g soil sample was dissolved to give 0.500 L of solution. A 150.0 mL aliquot was acidified and excess sodium tetraphenylborate was added to precipitate both K+ and NH4+ ions completely. B(C6H5)4-+K+⟶KB(C6H5)4(s) B(C6H5)4-+NH4+⟶NH4B(C6H5)4(s) The resulting precipitate amounted to 0.269 g. A new 300.0 mL aliquot of the original solution was made alkaline and heated to remove all of the NH4+ as NH3. The resulting solution was then acidified, and excess sodium tetraphenylborate was added to give 0.129 g of precipitate. Find the mass percentages of NH4Cl and…Phosphate-buffered saline (PBS) is a solution commonly used in studies of animal tissues and cells. Its composition is 137 mM NaCl, 2.7 mM KC1, 10 mM Na, HPO, (pK, = 2.14), and 1.8 mM KH₂PO, (pK, = 6.86). Calculate the pH and osmolarity of PBS. Give the osmolarity in units of osmoles per liter (osm/L). pH = 7.605 osmolarity 313.0 Incorrect osm/LA 20.00 mL aliquot of lactic acid solution (HCH3H5O3) was titrated with 0.0980 M KOH(aq) using both an indicator and a pH meter. Ka (HCH3H5O3), is 1.38 x10-4. A total of 28.64 mL of 0.0980 M KOH(aq) was required to reach the equivalence point 1. Calculate the molarity of the lactic acid solution. 2. Calculate the pH of the lactic acid solution 3. Calculate the pH and [CH3H5O3-] at the half-equivalence point. 4. Calculate the pH at the equivalence point of the titration. 5. Suggest an appropriate indicator for titration. 6. Calculate the pH of the solution after 10.00 mL of 0.0980 M NaOH(aq) was added
- What is the molar solubility (in mols/L)of silver chloride in 2.00 M NH3(aq) given that Kgp of AGCI = 1.77x10-10 and Kf of Ag(NH3)2* is 1.70×107? Express your answer in decimal notation rounded to three significant figures.A 25.00-mL solution containing NaOH, Na2CO3, and NaHCO3 alone or in compatible combination was titrated with 0.0998 M HCl using phenolphthalein as indicator. The solution turned colourless after addition of 25.65 mL of HCl. Methyl orange was then added to the solution and an additional 6.95 mL of the acid was needed to change the colour of the indicator. Identify the components in the mixture and calculate the concentration of each in milligrams per millilitre of solution.What is the importance of non-aqueous titrations in pharmaceutical analysis?
- A 1.000 liter sample of sea water was evaporated to a small volume and treated with an excess of sodium tetraphenylboron. The precipitated tetraphenylboron was filtered and then redissolved in acetone. The analysis was completed by a Mohr titration that required 34.32 ml of 0.03875 M AGNO3. Calculate the parts per million of potassium in the sea water sample. K* + NaB(C,Hs)4 → KB(C,Hs)4(s) + Na* ; Ag* + KB(C,H5)4 > AgB(CgHs)4(6) + K*A substance contains 0.5 g of magnesium hydroxide as the only basic ingredient . The sunstamce is analysed by dissolving it and titrating with a standard hydrochloric acid solution .The hydrochloric acid solution used in this titration is made by diluting 200 ml of 2M standardised solution to 500 ml 1.Calculate the volume of the HCl solution required to neutralize two of these indigestion substaces dissolved in water to make 35ml solution and calculate the concentration of Cl- in the final solution in mol.dm-3A titrant solution of KMnO was standardized with 0.2000 grams of Na2C2O4 and consumed 27.75 mL to reach end point. Calculate the standardized NORMAL concentration of the titrant.
- PREPARATION OF CHEMICAL REAGENTS As an intern in a research laboratory, you were asked to assist a researcher working on the characterization of pathogens found in a domestic wastewater sample. Specifically, you were tasked to prepare 350mL of a solution that will be used to resuspend and extract specific components from the pelleted slew of pathogens. The extraction solution is composed of 0.75 M phosphate buffer pH 8.0 (Ka2 = 6.2 × 10–8), 1.25 M CaCl2, 0.5% (w/v) SDS (sodium dodecyl sulfate), and 2.5mg per mL proteinase K. The following solutions/reagents are available in the lab in sufficient amounts: 5.0 N CaCl2 solution SDS powder (MM=288.38 g/mol) 20mg/mL proteinase K stock solution 3N HCl and 2M NaOH solutions solid NaH2PO4 (MM=119.98 g/mol) and Na2HPO4 (MM=141.96 g/mol) Calculate the amount of reagents needed in order to prepare the desired components of the extraction solution. Show complete calculations and box your final answers.The alcohol content of a certain low alcohol beer was determined using volumetric analysis. In this analysis, a 17.1-mL sample of the beer was pipetted into a 100-mL volumetric flask and the solution was made up to the mark. Then 20.4 mL aliquots of his solution were titrated against acidified potassium dichromate solution, K,Cr,0, of concentration 0.077 mol/L. A mean titre (or volume of the titrant) of 19.9 mL was obtained. The equation for the analysis is: 2- 3+ 2 Cr,0," (aq) + 3 C,H,OH (aq) + 16 H (aq) = 4 Cr (aq) + 3 CH,COOH (aq) + 11 H,0 (I) What was the molarity of the alcohol in the beer?An aliquot of 20 ml of skim milk was placed in an Erlenmeyer flask. To the flask was added 3 to 4 drops of phenolphthalein. The sample was titrated in triplicate using a previously standardized NaOH solution 0.101M. The volumes of NaOH spent in the three experiments to reach chemical equivalence were 3.6ml, 3.7ml and 3.5ml. 1) Express the acidity of milk in g/L of lactic acid. 2) Assuming that the only acid present in milk is lactic acid, would you expect the pH corresponding to the equivalence point was 7?.