Plot absorbance as a function of the concentration of Cr (IV) standard. Determine the equation of the line and the X intercept. The unknown and all standard additions were made up to the same final volume (final volume is not given in the problem). (a) Find the concentration of Cr (IV) in the river water. Solutions River water River water + 100 ppb Cr (IV) River water + 200 ppb Cr (IV) River water + 300 ppb Cr (IV) River water + 400 ppb Cr (IV) River water + 500 ppb Cr (IV) Current (μA) 0.95 1.21 1.34 1.57 1.75 2.05
Q: is prepared containing 0.1 M of a weak acid HA (K₁=1x108) and 0.2 M of its conjugate E
A:
Q: Distinguish between High Density Polyethylene (HDPE), Low Density Polyethylene (LDPE) and Linear Low…
A: High density polyethylene:- a) high density b) stronger intermolecular forces , stronger than low…
Q: What series of reaction should be done to come up with the desired product? Refer to the reaction…
A: Concept based on the benzene ring and it's reactions.
Q: 3. Connect the following monosaccharides into a polysaccharide. Identify the glycosidic linkages. си…
A:
Q: Arrange the following in terms of decreasing acidity. Type the letter labels for each structure on…
A: Acidic strength of organic acids like carboxylic acids, alcohols and phenols depends upon its…
Q: Synthesis #2 CHPh H from compounds with 6 carbons or fewer
A: To get the reactant molecule for synthesizing this molecule we have to carry out Retro-synthetic…
Q: For the reaction: A+B⟺C The concentration of A is 0.96M, the concentration of C is 0.85M, and the…
A:
Q: Rank the following substances in order in increasing intermolecular forces: a. CH3F b. CH3NH2 c.…
A:
Q: Consider the following reactions and choose the correct structures from the pool of choices below.…
A:
Q: Where did the 14 come from in the equation, poh=14-ph?
A: An explanation about the equation poh=14-ph is shown in the next step.
Q: O NY a. Draw the structure of the tetrahedral intermediate INITIALLY FORMED in the reaction shown. +…
A: A nucleophile adds to the electrophilic carbonyl group and gives a tetrahedral intermediate.
Q: Which liquid would have the highest boiling point? a. Ch3-OH b. CH3-O-CH3 c. CH3-Ch3
A: Boiling point is a temperature at which pressure exerted by surrounding on liquid is equal to…
Q: y Choose the atom or ion in each pair which best fulfills the given criterion: (i) Greater atomic…
A: As per the bartleby expert guidelines, I am allowed to answer first threw questions at a time.…
Q: OH a Give the IUPAC name OH NO₂ to
A:
Q: Show that Y=22.4sin(1.1x) is an eigenfunction of the operator (d²/dx²). What is the eigenvalue? O a.…
A:
Q: 22 How many pi bonds are formed in the hydrocarbon structure shown below?
A: Bonds are two type →1) Sigma bond (σ) 2) Pi bond (π) A single bond contains sigma bond and a double…
Q: Illustrate hydrogen bonding in simple molecules (hydrogen donor, hydrogen acceptor)
A: Here we have to explain the hydrogen bonding in simple molecules. Hydrogen bonding is a special…
Q: 1 Sketch the galvanic cells based on the following overall reactions. Show the direction of the…
A:
Q: Given the jonic, canatives Complete reaction between a hydrochloric aied and Sodium hydroxide come…
A: Neutralization reaction are those in which acid react with base to form salt and water.
Q: 31 What is the accepted IUPAC name for the following hydrocarbon? Place your answer in the box and…
A: The IUPAC name of the compound can be written on the basis of the number of carbon atoms in the main…
Q: What is the molarity of a solution made by dissolving 20.0g of H2PO4 in 50.0mL of solution? Show the…
A: Molarity is defined as number of moles of dilute dissolved per liter of solution.
Q: What is the abbreviated structural and skeletal formulas for the linear hydrocarbon with the…
A:
Q: Sea water contains roughly 28.0g of NaCl per litter. What is the molarity of sodium chloride in sea…
A: Here we are required to find the Molarity of NaCl in sea water.
Q: Which molecule contains the smallest bond angle? O they all have the same bond angle O BeF2 O KrF2 O…
A: Since, For determination of bond angle, first determine the shape of the molecule using VSEPR…
Q: Question 32 32) How many unpaired electrons would you expect for the complex ion: [Fe(NH3)6]2+?…
A:
Q: Provide a multi-step synthesis of the target structure on the right from the starting structure on…
A:
Q: Without using a calculator, which has the greater mass: One mole of carbon atoms or one mole of…
A:
Q: 5. NO₂ Total # of Valence Electrons: Lewis Structure (show all resonance structures if applicable)…
A: We have to draw the Lewis structures for the given two molecules and fill the given tables
Q: confirmation ▪ True or false: The purpose of the internal standard is to make quantitation of the…
A: Internal standard is added blank as well as sample to determine the concentration of analyte.
Q: Draw the structures of the compounds below and give the number of peaks observed in their 1H and 13C…
A:
Q: CH3CHCCI CH3 + 98 2 a. Draw the structure of the tetrahedral intermediate INITIALLY FORMED in the…
A: Acid chloride reacts with 2 molecules of primary amine to form a secondary amide.
Q: 38) A reaction is found to have an activation energy of 108 kJ/mol. If the rate constant for this…
A:
Q: data were collected for the reaction at 580 K 2HI(g) → H₂(g) + 1₂(8) 2 t(s) [HI]/ (mol dm 3₁ 0 1.00…
A:
Q: Match the peaks in this spectrum with the carbons on the structure belo 180 160 140 120 A) 1: 22.6…
A:
Q: QUESTION 10 What is the solubility (g/L) of barium fluoride, BaF2, in water?
A:
Q: 14.41 Label nonequivalent carbons in the following compounds. CHO OCH, OCH, CH,Q CH₂0 OCH, д
A:
Q: What is the oxidation number of phosphorus in Ni3(PO4)2? +4 +3…
A:
Q: OH 3-pentanol OH diphenylmethanol pentanol benzophenone OH Test: Positive Sign: Test: Positive Sign:
A: Disclaimer “Since you have asked multiple question, we will solve the first question for you. If…
Q: As explained in the book, the Voltaic cell is where the two components of a spontaneous redox…
A: In a Galvanic cell, Zn(s) undergoes oxidation to Zn2+(aq) and Cu2+(aq) undergoes reduction to form…
Q: To a test tube containing 5.0 ml of 1.00 M NaOH at 27°C in a calorimeter, 5.0 ml of 2.00 M HNO3 at…
A: To a test tube containing 5.0 ml of 1.00 M NaOH at 27°C in a calorimeter, 5.0 ml of 2.00 M HNO3 at…
Q: Calculate the mas of KC2H3O2 that must be added to 500.0mL of a 0.200 M HC2H3O2 (Ka = 1.8 x 10-5)…
A: Given→ Volume of HC2H3O2 = 500.0 mL Molarity of HC2H3O2 = 0.200 M Ka…
Q: Which statement is false? 4 electron groups matches with a tetrahedral electron pair geometry For an…
A: Ans. Option (C) is false. Resonance structure is a method of describing de-localized electrons…
Q: Question 5 When the following redox equation is balanced in acidic solution, how many H* are there…
A: Recall the given redox equations, NO3- aq + Cu s → Cu2+ aq + NO2 g…
Q: 1. Draw structures to show how each of the open-chain monosaccharides below forms a ring structure.…
A:
Q: 5. NO₂¹ Total # of Valence Electrons: 18 Lewis Structure (show all resonance structures if…
A: In the above question NO2- and H3O+ are given and Lewis structure of these molecules is asked, and…
Q: Oxyacetylene torches rely on a precise mixture of fuel (C₂H₂(g)) to oxygen to optimize the welding…
A:
Q: C. Trehalose and isomaltose are both dimers of glucose. However, they have considerably different…
A: #C: Trehalose is formed by the 1→1 glycosidic bond between two α-glucose units. Isomaltose is…
Q: A ¹H NMR spectrum is shown for a molecule with the molecular formula of C6H15N. Draw the structure…
A: using the NMR spectra and the molecular formula of the compound, we have to predict it's structure
Q: What is the numerical value of the autoionization constant for water, Kw?
A: numerical value of the autoionization constant for water, Kw?
Q: What is the percent composition of a solution in which 80 grams of sodium hydroxide, NaOH, is…
A:
Step by step
Solved in 3 steps with 1 images
- answer the following 3. What is the path length in centimeters when the molar absorptivity for a given absorbing species is 1.32 x 103L mol-1cm-1, the concentration is 0.000923 M, and the absorbance is 0.490? 4. Value for Kw at 0.0°C is 1.14 x 10-15. Calculate the pH for a neutral solution at this temperature.The un-ionized form of the weak acid HA does not absorb in the visible region. When it ionizes, its conjugate base (A-) absorbs light strongly at 510 nm. The following data were obtained by measuring the absorbance at 510 nm of solutions with a concen- tration of 1.0 x 104 M HA in different pH buffers. pH Absorbance 2.0 0.00 3.0 0.00 4.0 0.00 5.0 0.025 6.0 0.180 7.0 0.480 8.0 0.570 9.0 0.595 10.0 0.595 11.0 0.595 12.0 0.595 What is the approximate pK of HA?6. Blue Blue dye stock solution 0.293 M Absorbance at 630 nm 0.00265 Calibration curve y = 0.0833x A solution is prepared by diluting 2.79 mL of the blue dye stock solution to 25.00 mL. The measured absorbance for the prepared solution is listed in the data table. (a) What is the theoretical molar concentration? [Blue]theoretical x 10 |M (b) What is the experimental molar concentration? [Blue]experimental x 10 M (c) What is the percent error? Percent error (blue) = %
- Estimate the Ka of a weak acid from the data given below. One gram quantities of the acid were dissolved in equal quantities of the various buffer solutions and all solutions were measured under the same conditions. The anion of the acid is the only species that absorbs at the wavelength used. pH: Abs: 4 0.0 5 0.0 6 0.06 7 0.39 8 0.95 9 1.13 10 11 1.18 1.18The table below describes a procedure in preparing standard solutions of a protein sample with different concentrations. (A) Determine the concentrations of each tube if the starting concentration of the protein is 500 mg mL (B) Determine the equation of the line if the concentration (x-axis) was plotted vs the absorbance (y-axis). (C) What is the concentration, in mg mL, of the diluted unknown protein sample if the absorbance at 595 nm is 0.333? L-1. Tube Volume of protein, Volume of water, Final concentration, Absorbance #3 mL mL (at 595 nm) mg mL-1 0.00 5.00 0.113 12 0.70 4.30 0.184 3 1.40 3.60 0.251 14 2.10 2.90 0.329 15 2.80 2.20 0.385 3.50 1.50 0.454 17 4.20 0.80 0.503 8 5.00 0.00 0.577 Suppose that the unknown protein (diluted) sample in 4.C was diluted from a protein stock solution. Determine the concentration of the original unknown protein stock solution if 2.00 mL of the protein solution was mixed with 8.00 mL of water to create the unknown protein (diluted) sample in 4.C.The standard curve was made by spectrophotographic analysis of equilibrated iron(III) thiocyanate solutions of known concentration. You are asked to analyze a Fe(SCN)2+Fe(SCN)2+ solution with an unknown concentration and an absorbance value of 0.4150.415 . The slope-intercept form of the equation of the line is ?=4558.4?+0.0147y=4558.4x+0.0147 . The unknown was analyzed on the same instrument as the standard curve solutions at the same temperature. What is the Fe3+Fe3+ concentration of the unknown solution?
- 45.0 mL of an unknown FeCl3 solution is diluted to a total volume of 230.0 mL. The diluted FeCl3 solution measured an absorbance of 0.223. Calculate the molarity of the undiluted unknown FeCl3 solution if the molar extinction coefficient is 230.0 M-1⋅cm-1 and a path length of 1.00 cm.5. A solution of certain dye has a calibration graph shown below when measured at 425 nm in 1.00cm cells. A sample of the dye with an unknown concentration has an absorbance of 0.733. Determine the molar absorptivity of the dye at 425 nm and the concentration of the dye in the unknown solution. Absorbance vs. Concentration 1.200 1.100 1.000 0.900 0.800 0.700 0.600 0.500 0.400 1.50E-05 2.50E-05 3.50E-05 4.50E-05 5.50E-05 6.50E-05 Dye Concentration (Mol/L)calculate the [FESCN2+] using volumes of stock solutions. Presume that all of the SCN- ions react. Next, record the light absorbance values of each standard solution. Volume Volume Volume [FESCN2+] Absorbance Standard Fe(NO3)3 SCN- H2O sample (mL) (mL) (mL) 1 2.50 2.00 20.50 0.1811 2 2.50 1.50 21.00 0.3219 2.50 1.00 21.50 0.4981 4 2.50 0.50 22.00 0.6328 Stock [Fe(NO3)3] = 0.200 M, Stock [SCN-] = 0.0020 M. %3D
- Standardization of EDTA was done using MgSO4 standard wherein a 50-mL aliquot of solution obtained from 0.480 g MgSO4 in 500 mL needed 39.4 mL of the EDTA solution to reach the endpoint. Determine how many milligrams of CaCO3 will react per mL of this EDTA solution.A solution of Tryptophan has an absorbance at 280 nm of 0.54 in a 0.5 cm length cuvette. Given the absorbance coefficient of trp is 6.4 x 103 Lmol-1cm-1. What is the concentration of solution? The options are as follows A) 0.17 x10-3 mol/L B)2.56x10-3mol/L C)0.17x10+3mol/L D)2.56x10+3mol/LThe following data were obtained from the spectrophotometric titration of Cu(II) and Ca(II) in an unknown solution. A 25.00 mL aliquot of the unknown was taken to which 50.0 mL of ethanolamine buffer and 25.0 mL of distilled water were added. The solution was then titrated with standard 0.2508 M EDTA solution. Plot the recorded data, absorbance against volume of EDTA in mL. Correct the absorbance for volume changes. Calculate the number of moles of Ca(II) and Cu(II) in the unknown sample. Vol of Titrant, mL Vol of Titrant, mL Abs Abs 0.0 0.416 12.5 0.886 2.0 0.415 13.0 0.923 4.0 0.409 13.5 0.958 6.0 0.416 14.0 0.979 8.0 0.535 14.5 0.969 10.0 0.690 15.0 0.971 11.0 0.770 15.5 0.964 12.0 0.840