The absorbance of a cationic iron(II) sample solution was measured in a spectrophotometer, but the instrument returned an error because the absorbance was too high. The sample was then diluted by using a pipette to take 100.0 µL of the sample and injecting it into a cuvette already containing 2.00 mL of water (total volume is 2.00 mL + 100.0 uL). The absorbance value of the diluted solution corresponded to a concentration of 6.21x10 6 M.What was the concentration of the original solution? Express the concentration to three significant figures with the appropriate units.
Q: Consider the structure of testosterone to identify the best suitable quantitative analysis for…
A: The steroid hormone testosterone is very significant. Total testosterone levels in healthy,…
Q: Your instructor has asked you to prepare 2.00 L of 0.169 M NaOH from a stock solution of 53.4 (60.4)…
A: a.
Q: Discuss the contribution of Amadeo Avogadro to the quantitative aspect of Chemistry.
A: Amedeo Carlo Avogadro is an Italian chemist, well known for Avogadro's law and Avogadro's number or…
Q: A student collected the following data in the laboratory: Mass of flask 52.8741 g Mass of flask…
A: Ascorbic acid reacts with sodium hydroxide in a acid base titration reaction. This reaction is also…
Q: Part B Observe and record the appearances of the metal strips and the solutions in the test tubes.…
A: Appearance of metal and metal solution
Q: Part C The absorbance of a cationic iron(II) sample solution was measured in a spectrophotometer,…
A: Answer :- Part A :- M1V1 = 0.0514 (mol) Part B :- V1 = 6.42 (mL) Part C :- Original Concentration Of…
Q: Explain three different types of mass spectrometers. Differentiate them, construction,working and…
A: Interpretation - To explain three different types of mass spectrometers and we have to differentiate…
Q: 01 i Jal ll pi (NaCIy o.2 N.uJ 250 (6 Na = 23. Cl = 35.5 Q1 :- prepare a standard solution of a…
A: Normality is the ratio of gram equivalent to the volume of the solution.
Q: Given the following data, calculate the mass percentage of copper in the unknown copper oxide sample…
A: According to the question, Mass of empty test tube:…
Q: What effect would each of the following have on the calculated molar mass of an unknown, as…
A: The balance is not zeroed before weighing of the sample, test tube and water. This means that the…
Q: Which of the following variables does absorbance not depend upon? A. Molar absorptivity of the…
A:
Q: A 2.00 L graduated cylinder contains 1.40 L of buffer solution. The density of the buffer solution…
A:
Q: Potentially Useful Information Spectrochemical Series: I < Br° < SCN" < cI' < NO3° < F° < OH° <…
A: From given Initially ligand is categorized and based on the spectrochemical series it is discussed…
Q: Classify each micronutrient in Figure 2.2as a metal, nonmetal, or metalloid.
A: An atom can be considered as the smallest unit of any matter. An atom is composed of certain…
Q: 1. What is a spectrophotometer used for in a cobalt chloride solution analysis?
A:
Q: 2. What measurements might you record regarding water samples to assist with the quantification…
A: Q2) The analysis of water samples are done to know the water quality of the water.
Q: 1. (a) A solution of NaCl is prepared by dissolving 0.0056 g NaCl with enough H2O in a volumetric…
A: Solution 1- Concentration is calculated in terms of molarity =number of moles of solute /volume of…
Q: MnSO4-4H20 in the mixture? O 11.2% O 65.3% C 69.6% O 34.7% O 88.8% O None of the above
A:
Q: A chemist needs to create a series of standard Cu2+(aq) solutions for an absorbance experiment. For…
A: In titrations, a standard solution is used; this is called a stock solution. It is diluted by adding…
Q: The relationship between ppm with M and N: ppm = M x M.mass x 1000 ppm = N x Eq.mass x 1000 %3D
A: ppm stands for "parts per million" and it also can be expressed as milligrams per liter (mg/L). This…
Q: You begin preparation of the calibration curve to measure absorbance vs concentration of FeSCN2+. To…
A: Molarity is the way of expressing concentrations which is defined as moles of solute dissolved per…
Q: A chemist needs to create a series of standard Cu2+(aq) solutions for an absorbance experiment. For…
A: Given that 25.00 m L of a 2.55 M Cu+2 stock solution is added to a 500 volumetric flask and water is…
Q: Which of the following is NOT true about flash combustion? 1. The process is faster and simpler than…
A: The Flash combustion method produces a complete combustion of the sample within. a high-temperature…
Q: A chemist needs to create a series of standard Cu²+ (aq) solutions for an absorbance experiment. For…
A: Molarity of the Cu+2 stock solution= 2.07 M Dilution formula is M₁V₁ = M₂V₂ where M₁ and V₁…
Q: A chemist needs to create a series of standard Cu2+(aq)Cu2+(aq) solutions for an absorbance…
A: We know that moles of Cu2+ = volume of Cu2+ added in lit X molarity. Since initially we added 5 ml…
Q: A substance with a molar mass of about 120 and containing only carbon and hydrogen; δ= 1,2 one in…
A: Introduction: Spectroscopic methods are useful for the structure determination of a compound.IR…
Q: To determine the phosphate concentration in a water sample, the following standard curve was…
A: The calibration curve between the absorbance and concentration of phosphate ion is given as, Given:…
Q: Write the different methods of Equivalence Calculations?
A: There are various methods of finding equivalence point. Few of them are as follows: 1) Color change…
Q: The ingredients contained in grape Kool-Aid can be approximated as: • water (H2O, density = 1.000…
A: Given: Volume of solution = 500 mL = 0.500 L (Since 1 L = 1000 mL) Mass of…
Q: The following ratios of NaOH to HCl were determined in an analysis: T1 = 0.9958, T2 = 0.9929. How…
A:
Q: 4. Cite two possible applications of silver nanoparticles. Explain the role of its nano-size towards…
A: A nanoparticle is a small particle that ranges between 1 to 100 nanometres in size. Undetectable by…
Q: A chemist needs to create a series of standard Cu2+(aq)Cu2+(aq) solutions for an absorbance…
A:
Q: The absorbance of a cationic iron(II) sample solution was measured in a spectrophotometer, but the…
A: Given that: initial volume = 100.0 μL dilution volume = 2.00 mL + 100.0 μL concentration of…
Q: A student found that her mixture was 13% NH¼CI, 18% NaCl and 75% SIO2. Assuming that her…
A: on addition of the given percentages, the total percentage of the solution comes out to be as 106%…
Q: You were calculating the concentration of EDTA (MW 372.24 g/mol; Q = 98.45%). You weighed out 8.6731…
A: “Since you have asked multiple question, we will solve the first question for you. If youwant any…
Q: 4.Determine the type of assay employed for this substance: ZINC OXIDE 5.The solvent used in making…
A: Since you have posted a question with multiple sub-parts, we will solve first three subparts for…
Q: A method of analysis yields masses of gold that are low by 0.4 mg. This method is used for analysis…
A: The relative error is (mass loss/Total mass )x 100. Based on above detail solution is provided…
Q: What are advantages and limitations of different types of modelling? (modelling with experiments,…
A: In chemistry there are many ways to check the deviation of experimental data from the accurate…
Q: 1.46 g Potassium hydrogen phthalate requires 34.3 mL of 0.145M NaOH for neutralization, what…
A: Given : Mass of Potassium hydrogen phthalate = 1.46g
Q: A chemist needs to create a series of standard Cu²+ (aq) solutions for an absorbance experiment. For…
A: Molarity = Number of moles of solute/ Volume of solution(L) M1V1 = M2V2 M1 = initial molarity M2 =…
Q: 1.) A pure Alum salt KAl(SO4)212H2O contains 300 mg of Potassium. What is the weight of pure Alum?
A: Since you have asked multiple questions, we will solve the first question for you. If you want any…
Q: Discuss 5 advantages and disadvantages of palm oil source of oleochemicals in Malaysia.
A: Advantages of palm oil source of oleochemicals in Malaysia. 1) Malaysia contributes about 20% to the…
Q: Data ) Mass of Sodium Salicylate (g) 115a X 2) Concentration of Sodium Salicylate (M) 287 10M…
A: The concentration of the solution can be measured in various units the commonly used is molarity.…
Q: Whilst working in the pharmacy aseptic unit you are asked to prepare 5 litres of a solution…
A: Given; Note: 1L = 1000 mL Volume of the solution = 5 L = 5000 mL Concentration of the solution…
Q: How many g of water you need to add into HCl solution (V= 130.0 cm3 mass percentage 22.0 % (w/w),…
A: Mass = Volume ×Density
Trending now
This is a popular solution!
Step by step
Solved in 2 steps
- The absorbance of a cationic iron(II) sample solution was measured in a spectrophotometer, but the instrument returned an error because the absorbance was too high. The sample was then diluted by using a pipette to take 100.0 μLμL of the sample and injecting it into a cuvette already containing 2.00 mLmL of water (total volume is 2.00 mLmL + 100.0 μLμL). The absorbance value of the diluted solution corresponded to a concentration of 7.71×10−6 M M . What was the concentration of the original solution? Express the concentration to three significant figures with the appropriate units.The absorbance of a cationic iron(II) sample solution was measured in a spectrophotometer, but the instrument returned an error because the absorbance was too high. The sample was then diluted by using a pipette to take 100.0 μL�L of the sample and injecting it into a cuvette already containing 2.00 mLmL of water (total volume is 2.00 mLmL + 100.0 μL�L). The absorbance value of the diluted solution corresponded to a concentration of 6.22×10−6 M � . What was the concentration of the original solution?After creating her standard curve for absorption versus the concentration (M) of FD&C Red 40 and processing her data, Sally found that her drinking strength Kool-Aid sample had a concentration of 4.692 x 10–5 M. If 0.132 grams of Kool-Aid powder was used to prepare an 8-fl oz cup of her assigned flavor, what is the percent by mass of FD&C Red 40 in her Kool-aid powder? Report your answer as a percentage with two places after the decimal. Do not include the percentage sign in your answer. Pay attention to units. You are trying to find the mass percentage of red dye, so you need to know each variable in the equation in Appendix B. Note that the percent by mass equation should be multiplied by 100. There may be some useful conversion factors in the experimental procedure.
- After creating her standard curve for absorption versus the concentration (M) of FD&C Red 40 and processing her data, Sally found that her drinking strength Kool-Aid sample had an FD&C Red 40 concentration of 1.086 x 10–5 M. If 0.133 grams of Kool-Aid powder was used to prepare an 8-fl oz cup of her assigned flavor, what is the percent by mass of FD&C Red 40 in her Kool-aid powder?A chemist needs to create a series of standard Cu2+(aq) solutions for an absorbance experiment. For the first standard, he uses a pipet to transfer 25.0025.00 mL of a 2.552.55 M Cu2+(aq) stock solution to a 500.0 volumetric flask, and he adds enough water to dilute to the mark. He then uses a second pipet to transfer 10.00 mL of the second solution to a 100.0 mL volumetric flask, and he adds enough water to dilute to the mark. Calculate the concentration of the Cu2+(aq) solution in the 100.0 mL volumetric flask.A volumetric calcium analysis on triplicate samples of the blood serum of a patient believed to be suffering from a hyperparathyroid condition produced the following data: mmol Ca/L = 3.15, 3.25, 3.26. What is the 95% confidence interval for the mean of the data, assuming no prior information about the precision of the analysis?
- To prepare a standard solution of Mn2+, a 0.250 g sample of Mn is dissolved in 10 mL of concentrated HNO3 (measured with a graduated cylinder). The resulting solution is quantitatively transferred to a 100-mL volumetric flask and diluted to volume with distilled water. A 10-mL aliquot of the solution is pipeted into a 500-mL volumetric flask and diluted to volume.a. Express the concentration of Mn in mg/L, and estimate its uncertainty using a propagation of uncertainty.b. Can you improve the concentration’s uncertainty by using a pipet to measure the HNO3, instead of a graduated cylinder?What are the differences between systematic and random errors and how do they effect accuracy and precision? In what circumstances would you use standard addition (versus a normal calibration curve) to determine the amount of an analyte in a sample? A urine sample, containing analyte Z is analysed by the standard addition method where 5 mL of the original sample was mixed with increasing amounts of a Z standard and each solution diluted to a volume of 50 mL prior to analysis. A plot of the final concentration of the standard in each of the 50 mL samples (x axis) versus The measured signal from the analysis of each 50 mL sample (on y axis) produced a straight line with the general equation: y = 44.72x + 4.06 what was the final concentration of Z in the 50 mL standard addition sample? what was the initial concentration of Z in the original urine sample?Chemistry The most abundant type of mammalian antibody circulating in the blood stream is IgG. A solution prepared from 0.798 g of a particular IgG in 250 mL of water shows an absorbance of 0.578 at 275 nm in a 1.00 cm cell. If the molar absorptivity of the IgG is 6.49 × 104 M–1 cm–1 at 275 nm, what is the molar mass of the IgG? Present your numerical answer in kg·mol-1 to 3 significant figures .
- Julie has been asked to measure the concentration of a sample solution using a spectrophotometer. After a first attempt, she realizes that, to make the measurement, she must first dilute the sample solution. Julie transfers 2.3 mL2.3 mL of the sample to a 250 mL250 mL volumetric flask and fills the rest of the flask with water to the 250 mL250 mL line. She then uses the spectrophotometer to measure the concentration of the dilute solution as 5.5×10−5 M.5.5×10−5 M. What is the concentration of the starting sample solution? sample solution concentration: MJulie has been asked to measure the concentration of a sample solution using a spectrophotometer. After a first attempt, she realizes that, to make the measurement, she must first dilute the sample solution. Julie transfers 1.3 mL1.3 mL of the sample to a 250 mL250 mL volumetric flask and fills the rest of the flask with water to the 250 mL250 mL line. She then uses the spectrophotometer to measure the concentration of the dilute solution as 5.5×10−5 M.5.5×10−5 M. What is the concentration of the starting sample solution?I submitted these responses and they were incorrect. Are there any other suggestions?