A student creates a calibration plot for serial dilutions of Cu(NO3)2. A graph of concentration in M (x-axis) versus absorbance (y-axis) gives a linear trendline of y = 0.345x - 0.11. e.) Copper(II) nitrate has a solubility of 83.5 g in 100 g of water. Calculate the percent error in the student's concentration.
Q: Based on the associated solubility chart, at what temperature would you need to heat a solution of…
A: 1- You can see the curve of NaNO3 between solubility of salt vs temperature. It is straight line…
Q: The thiourea in a 1.455 g sample of organic material was extracted into a dilute sulfuric acid…
A:
Q: The toxicity of DDT (C14H9CI5) led to a ban on its use in the United States in 1972. Determinations…
A: Molecular formula of DDT - C14H9Cl5 Molecular Mass of DDT - 354.49 g/mol Number of moles = mass of…
Q: To make a calibration curve, you would first make a stock solution. Determine the mass of copper(II)…
A: Since you have asked multiple question, we will solve the first question for you.If you want any…
Q: 1.50 mL of 0.15M Fe2(SO4)3 is diluted with deionized water to 25.00 mL in a volumetric flask. What…
A: Given, 1.50 mL of 0.15M Fe2(SO4)3
Q: please answer questions 1) and 2) (they are part of the same question). thank you
A: The term number of moles is defined as the ratio of mass to the molar mass of the given compound.…
Q: Following the directions in the laboratory manual, you create Standard 2 by transferring the…
A: Calculate the total volume of mixture of solution in the test tube. i.e.…
Q: The Kjeldahl method was used to determine the nitrogen content of a soil sample. 25 g soil sample…
A: Solution: We know Kjeldahl method is used to determine the nitrogen content of the any sample.…
Q: 5. Why is decantation rather than filtration the preferred method of separating the salt from the…
A:
Q: the mass percent of an unknown NaCl solution with a conductivity of 1,566 uS/cm?
A: We have to find mass percent of an unknown NaCl solution with a conductivity of 1,566 uS/cm. Given…
Q: A chemist needs to determine the concentration of a sulfuric acid solution by titration with a…
A: Given: Concentration of NaOH (MNaOH) = 0.1328 M Volume of NaOH (VNaOH) = 12.39 mL Volume of H2SO4…
Q: A solution was prepared by dissolving 1210 mg of K3Fe(CN)6 (329.2 g/mol) in sufficient water to give…
A: Hey, since there are multiple questions posted, we will answer first question. If you want any…
Q: used a pipette to add 25 cm of sodium hydroxide of unknown concentration to a conical flask. The…
A: Few questions based on acid-base titration, which are to be accomplished.
Q: Starting concentrations of yourmetal ions in your initial solution: [M+]= 4.00 x 10-5 M [M2+]=…
A: Precipitation will start when Ksp = ionic product ionic product is the product of concentration…
Q: An unknown sample containing a mixture of NaCl and Na2CO3 was analyzed to determine the %…
A:
Q: A chemical factory has been illegally disposing their chemical wastes without necessary…
A: Given, Site A B…
Q: A chemist needs to determine the concentration of a sulfuric acid solution by titration with a…
A: Titrimetric analysis involves determination of the volume of a solution of accurately known…
Q: 1. The Fe2+ content of iron tablets was determined by titration with a freshly standardised solution…
A: In order to prepare a sensible titre, the solution should have concentration similar to that of the…
Q: 7. A 0.4021-g sample of a purified organic acid was dissolved in water and titrated…
A: Here we have to determine the molecular mass of organic acid if 0.4021 g of sample of purified…
Q: Identify the type of error (systematic or random) for each of the following situations below and…
A: Systematic error : it is repeatable error and consistent . it can be done by the analysts . it comes…
Q: We want to determine the purity of alum sample bought in a local pharmacy in Miagao. A Chem 28…
A: Mass of sample = 1.5879 gm Mass of Al2O3 = 0.1572 gm Molar mass of potash alum = 474.4 gm/mole…
Q: A solution contains 0.0040 M Na3PO4. Calculate the minimum concentration (in M) of Ag* needed to…
A: The concentration of Na3PO4 = 0.0040 M Solubility product concentration of Ag3PO4 = 1.8×10−18
Q: (d) In an experiment to standardize a solution of sulphuric acid, using a standard solution of…
A: Given in following question a experiment. 25cm3 a sodium hydroxide solution containing…
Q: Standardization of NaOH Trial 1 Trial 2 Trial 3 Trial 4 Trial 5 0.785 0. l690g 0.8239 Mass of KHP…
A: The mass of KHP used in trial 1, trial 2 and trial 3 is 0.785 g, 0.690 g and 0.823 g, respectively.…
Q: One of the standard solutions used in preparing the Calibration curve in Figure 1 was a 88.5 mM…
A: Given - Molarity of Cr(NO3)3 Solution = 88.5 mM = 88.5×0.001 = 0.0885 M And, volume of this…
Q: The diagram shows the apparatus for separating soil and water. What are the labeled parts? O A)A =…
A:
Q: Toxic Cr(VI) can be precipitated from an aqueous solution by bubbling SO2 through the solution. How…
A:
Q: A 0.1530 g of pure KIO3 was dissolved in 50 mL distilled water. This was then added with KI and 6N…
A: Normality of sodium thiosulfate solution can be calculated from the Molarity. So first we calculate…
Q: What is the mass percent of Fe for each trial ? Mass of (NH4)2Ce(NO3)6 (in 100.00 mL) = 4.5038…
A: The balanced chemical reaction between Fe2+ and Ce4+ is: Fe2++Ce4+↔Fe3++Ce3+
Q: A quantitative analysis for ethanol, C2H60, is accomplished by a redox back titration. Ethanol is…
A: The explanation is given below-
Q: 2. Your report should contain a table that lists the volumes of standardized NaOH solution required…
A: In acid base titration when we have volume of acid and base and have concentration of one of two,…
Q: The nitrogen and protein content of a 0.757 g sample of flour sample was analyzed using Kjeldahl…
A:
Q: A solution of potassium hydroxide KOH was prepared by dissolving 1g of it in 100ml of distilled…
A: Moles of KOH = Mass/Molar mass = 1g/(56.1g/mol) = 0.0178moles Mass of water = Density Volume =…
Q: Ammonia reacts with hypobromite, OBr- as follows: 2NH3 + 3OBr- → N2 + 3Br- + 3H2O…
A: Molarity is defined as total number of solute present in 1000 ml of solution . For neutralisation we…
Q: student creates a calibration plot for serial dilutions of Cu(NO3)2. A graph of concentration in M…
A: Introduction : Percent error is an expression to let know the difference between calculated value…
Q: 4) But the real angler continues, regardless of the local sage. What sort of tone does the author…
A: The sort of tone does the author create by using the connotative effects of the word sage in…
Q: Identify and explain the mistakes made in the following laboratory protocols: A 1250 mg sample of…
A: Before measuring the mass of any chemical compound, it is quite necessary to adjust the balance to…
Q: A student prepares a stock solution of BaF2 by dissolving 50.00 g of a BaF2 in 1.00 L of water. An…
A:
Q: 26. A student titrated nitric acid, HNO3(aq), with sodium hydroxide, NaOH(aq), using phenolphthalein…
A: 25) In the environment (soil, natural waters, etc.) I think ferric ions tend to be less soluble…
Q: Calculate the amount of ferrous ammonium sulfate [Fe(NH4)2(SO4)2•6H2O](MM = 392.14 g/mol) needed to…
A: Amount of ferrous ammonium sulfate can be calculated from the concentration and volume of solution.
Q: A calibration curve of NaCl conductivity (y-axis) vs concentration (mass percent, x-axis) is made.…
A:
Q: For this lab, 2 Lof 0.0020 M Fe(NO3)3 needed to be prepared. How many grams of Fe(NO3)3 needed to be…
A: Molarity is moles of substance present per liter volume. Molarity= moles of substance/ volume From…
Q: 2.) 0.100 g of Na2CO3 is added to a 200.0 ml solution of 1.00 x 103 M Ca(NO3)2. Calculate Q. Q = x…
A:
Q: 5. The teacher assign students to prepare a solution by dissolving 15.0 ml ethanol (C,H,OH) in water…
A: The molar mass of C2H5OH is 46.07g/mol as we get from standard sources. 15ml ethanol has been used.…
Q: 1.00 grams of table salt was dissolved in 100 mL water and excess AgNO3 reagent was added and…
A: Given, The mass of table salt 1.00 grams dissolved in 100 mL water and excess AgNO3 reagent was…
Q: Standardization of NaOH solution 1.trial 2.trial 15.0 mL of 0.1015 M HC1 + 15.3 mL NaOH 15.0 mL of…
A: At the equivalence point of the reaction, the moles of HCl and the moles of NaOH are equal. moles of…
A student creates a calibration plot for serial dilutions of Cu(NO3)2. A graph of concentration in M (x-axis) versus absorbance (y-axis) gives a linear trendline of y = 0.345x - 0.11.
e.) Copper(II) nitrate has a solubility of 83.5 g in 100 g of water. Calculate the percent error in the student's concentration.
Trending now
This is a popular solution!
Step by step
Solved in 2 steps
- A dilution of benzene in methanol is made by placing 1.5 mL benzene (density of benzene is 0.879 g/mL and its mol. Wt. is 78.1) in a 100-mL volumetric flask and brining to volume with methanol. What is the concentration of benzene in the solution in mg/L In ppmlA student creates a calibration plot for serial dilutions of Cu(NO3)2. A graph of concentration in M (x-axis) versus absorbance (y-axis) gives a linear trendline of y = 0.345x - 0.11. Copper(II) nitrate has a solubility of 83.5 g in 100 g of water. Calculate the percent error in the student's concentration.The toxicity of DDT (C14H9Cl5) led to a ban on its use in the United States in 1972. Determinations of DDT concentrations in groundwater samples from Pennsylvania between 1969 and 1971 yielded the following results: Location Sample Size Mass of DDT Orchard 253 mL 0.0310 mg Residential 1.77 L 0.0350 mg Residentialafter a storm 51.5 mL 0.570 mg Express these concentrations in millimoles per liter. Orchard= ___mmol/l Residental=___ mmol/l Residential after a storm=___ mmol/L
- One of the standard solutions used in preparing the Calibration curve in Figure 1 was a 88.5 mM Cr(NO3)3 solution. This solution was prepared by dissolving solid Cr(NO3)3 ∙ ∙9H2O hydrate in water. What mass of solid Cr(NO3)3 ∙ ∙9H2O would need to be dissolved in water to make a 0.566 L solution?A researcher wants to determine the concentration of beta-carotene in carrots. She obtains a 0.661 M stock solution of beta-carotene and creates Dilution A by transferring 26.00 mL of stock solution into a new container and diluting it with solvent to a final volume of 94.00 mL. She creates Dilution B by transferring 43.00 mL of stock solution into a new container and diluting it with solvent to a final volume of 75.00 mL. She creates Dilution C by transferring 6.00 mL of Dilution B into a new container and diluting it with solvent to a final volume of 15.00 mL. What is the concentration in mM of Dilution C?A researcher wants to determine the concentration of beta-carotene in carrots. She obtains a 0.689 M stock solution of beta-carotene and creates Dilution A by transferring 11.00 mL of stock solution into a new container and diluting it with solvent to a final volume of 91.00 mL. She creates Dilution B by transferring 51.00 mL of stock solution into a new container and diluting it with solvent to a final volume of 99.00 mL. She creates Dilution C by transferring 7.00 mL of Dilution B into a new container and diluting it with solvent to a final volume of 20.00 mL. She measures the absorbance of each solution and obtains the values below. Plot the data in a spreadsheet software and determine the best-fit line. What is the slope of the best-fit line? Report your answer with three places after the decimal. Solution Absorbance Stock solution 0.981 Dilution A 0.229 Dilution B 0.47 Dilution C 0.287
- Identify and explain the mistakes made in the following laboratory protocols: A 10.00 mM solution of glucose (FW 180.16 g/mole) was prepared by first adding 180.16 mg of glucose to a 100 mL empty volumetric flask, and then DI H2O was added to the volumetric flask until the meniscus reached the 100 mL volume mark. The flask was capped and the solution vigorously mixed until the glucose completely dissolved.A researcher wants to determine the concentration of beta-carotene in carrots. She obtains a 0.554 M stock solution of beta-carotene and creates Dilution A by transferring 23.00 mL of stock solution into a new container and diluting it with solvent to a final volume of 99.00 mL. She creates Dilution B by transferring 59.00 mL of stock solution into a new container and diluting it with solvent to a final volume of 73.00 mL. She creates Dilution C by transferring 8.00 mL of Dilution B into a new container and diluting it with solvent to a final volume of 25.00 mL. She measures the absorbance of each solution and obtains the values below. Plot the data in a spreadsheet software and determine the best-fit line. What is the slope of the best-fit line? Report your answer with three places after the decimal. Remember to draw a dilution diagram! The best-fit line will likely look atrocious, since this is completely fictitious data. Solution Absorbance Stock solution 0.971 Dilution A…A commercial research organization is planning to develop a sensor to detect methyl parathion that may be injected into a water supply by terrorists. The LD50 for methyl parathion is reported to be as low as 6 mg ・ kg−1 for rats. They are assuming a safety factor of 1 × 105 and a volume of liquid ingested equal to a cup of coffee (about 250 mL) in the design of the instrument. What concentration (in mg ・ L−1) must their instrument be able to detect? Using Equation 6–10, the concentration you have calculated, the ingestion rate of 250 mL, an exposure frequency of one day, and exposure duration of one day, an adult malebody weight, and an averaging time of 1 day, estimate the hazard index. The RfD for methyl parathion is 2.5 × 10−4 mg ・ kg−1 ・ d−1 .
- A researcher wants to determine the concentration of beta-carotene in carrots. She obtains a 0.609 M stock solution of beta-carotene and creates Dilution A by transferring 13.00 mL of stock solution into a new container and diluting it with solvent to a final volume of 96.00 mL. She creates Dilution B by transferring 52.00 mL of stock solution into a new container and diluting it with solvent to a final volume of 78.00 mL. She creates Dilution C by transferring 2.00 mL of Dilution B into a new container and diluting it with solvent to a final volume of 21.00 mL. What is the concentration in mM of Dilution C? Report your answer with one place after the decimal.A researcher wants to determine the concentration of beta-carotene in carrots. She obtains a 0.558 M stock solution of beta-carotene and creates Dilution A by transferring 15.00 mL of stock solution into a new container and diluting it with solvent to a final volume of 90.00 mL. She creates Dilution B by transferring 53.00 mL of stock solution into a new container and diluting it with solvent to a final volume of 80.00 mL. She creates Dilution C by transferring 2.00 mL of Dilution B into a new container and diluting it with solvent to a final volume of 15.00 mL. What is the concentration in mM of Dilution C? use one decimal placeA researcher wants to determine the concentration of beta-carotene in carrots. She obtains a 0.558 M stock solution of beta-carotene and creates Dilution A by transferring 15.00 mL of stock solution into a new container and diluting it with solvent to a final volume of 90.00 mL. She creates Dilution B by transferring 53.00 mL of stock solution into a new container and diluting it with solvent to a final volume of 80.00 mL. She creates Dilution C by transferring 2.00 mL of Dilution B into a new container and diluting it with solvent to a final volume of 15.00 mL. What is the concentration in mM of Dilution C? Report your answer with one place after the decimal. Remember to draw a dilution scheme!