100 µL of a 5.00 ppm Mn" solution was added to a 25.0 mL volumetric flask and made up to volume using deionised water. What is the [Mn"] in the flask? Select one: a. 0.0200 ppm b. 100 ppm С. 1.25 ppm d. 5.00 ppm е. 0.500 ppm
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![100 µL of a 5.00 ppm Mn" solution was added to a 25.0 mL volumetric flask and made up to volume using deionised water.
What is the [Mn"] in the flask?
Select one:
а. 0.0200 рpm
b. 100 ppm
с. 1.25 ppm
d. 5.00 ppm
e. 0.500 ppm](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F8f4c43bb-3f99-4dc3-ad58-cbb908a7fb6a%2F00b9de05-3275-4067-9fbf-70f4741ab29c%2Fshzgysa_processed.jpeg&w=3840&q=75)
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- detailed calculations on preparing the solutions listed below 25 mL of 0.1 M Cu(NO3)2 solution in deionised water 25 mL of 0.2 M Cu(NO3)2 solution in deionised water 25 mL of 0.5 M Cu(NO3)2 solution in deionised water 50 mL of 1.0 M HCl solution in deionised water Copper nitrate trihydrate: Formula: Cu(NO3)2.3H2O Mw: 241.60 g/mol State at RT: solid Purity: 98% Hydrochloric acid: Formula: HCl Mw: 36.46 g/mol State at RT: liquid Density: 1.18 g/ml Purity: 37% Acetic acid:The standard addition method is used to analyze a sample of a river water for mercury. Solution A is made by pipetting 5.00 mL of undiluted sample in to a 10 mL volumetric flask and filling to the mark with DI water. Solution B is made by pipetting 5.00 mL of undiluted sample and 3.00 mL of 15.0 ppb of Hg standard into same 10.0 mL volumetric flask and filling to the mark with DI. Solution A and B are analyzed using atomic absorption spectroscopy and give a percent transmittance values of 56 % and 33 % respectively (not blank corrected). A blank has a transmittance of 96%. What is the corrected absorbance of both solution A and B? A. Solution A: 0.123 Solution B: 0.463 B. Solution A: 0.463 Solution B: 0.234 C. Solution A: 0.123 Solution B: 0.234 D. Solution A: 0.234 Solution B: 0.463Prepare 25ppm of Cd (NO3 )2.4H2O in a 500ml from 1000ppm stock solution of Cd (NO3)2.4H2O
- The data below was obtained with a Cl- ISE to prepare a plot of mV vs. log[Cl-]. Assume the unknown saltwater solution was diluted as in the procedure before being measured. What is the ppm Cl- of the undiluted unknown solution? Cl- Concentration (ppm) Potential (mV) 10 160 100 94 1000 40 Diluted Unknown Saltwater 132Here is a use objective for a chemical analysis to be performed at a drinking water purification plant: “Data and results collected quarterly shall be used to determine whether the concentrations of haloacetates in the treated water demonstrate compliance with the levels set by the Stage 1 Disinfection By-products Rule using Method 552.2” (a specification that sets precision, accuracy, and other requirements). Which one of the following questions best summarizes the meaning of the use objective?(i) Are haloacetate concentrations known within specified precision and accuracy?(ii) Are any haloacetates detectable in the water?(iii) Do any haloacetate concentrations exceed the regulatory limit?To a 0.5 g sample of impure NaCl are added 0.784 g of pure AgNO3 (MW = 169.88) crystal. This is in excess of the amount required to ppt. All the Cl as AgCl. After dissolving and filtering out the pptd. AgCl, the filtrate requires 25.50 ml of 0.028M KCNS. What is the percentage of NaCl (MW=58.44) in the sample? A. 55.40 % B. 50.10% C. 45.60% D. 100%
- Rinse and fill the buret with 0.100 M HCl solution. Transfer accurately 25.0 mL of saturated calcium hydroxide solution (2g of calcium hydroxide per 100 ml of water) into two separate E-flasks. Add 2 drops of phenolphthalein to each flask and titrate each solution until the pink color disappears. Using the titration data for the determination of solubility and Ksp of calcium hydroxide: Parameter Trial 1 Trial 2 Final Buret Reading (mL) 5.80 12.20 Initial Buret Reading (mL) 0.00 5.80 Temperature (in celcius) 25 25 Construct an ICE table for the reactionA 25.00mL wastewater sample was analyzed for its Mg2+ content using a standard gravimetric method. the sample was diluted to 3.00L and an 11.00mL aliquot was treated to precipitate magnesium as MgNH4PO4.6H2O using (NH4)2HPO4 as the precipitating agent. the precipitate was then filtered, washed, dried, and ignited resulting in a 0.1325mg Mg2P2O7 residue. How much Mg (in ppm) is present in the original sampleCalculate the solubility at 25°C of Zn(OH)2 in pure water and in a 0.0080M ZnSO4 solution. You'll find Ksp data in the ALEKS Data tab. Round both of your answers to 2 significant digits. ksp of zn(OH)2 =3.0×10−17 solubility in pure water: gL solubility in 0.0080 M ZnSO4 solution: gL
- A 100 g soil containing 20% smectitie mineral matter was mixed with 150 mL solution containing 0.10 M Pb. CEC of pure smectitie is 110 emol(+)/kg. CEC of the soil (cmol(+)/kg) is:Calculate the solubility of lead(II) sulfate (Ksp = 2.53x10-8) in a 0.0034 M solution of sodium sulfate. Give your answer to three sig. figs. and in exponential form (e. g. 1.23E-3).1) How many milliliters of 70% ethanol and 20% ethanol must be mixed to prepare 500ml of 30% ethanol? 2) A gaseous blend of nitric oxide and nitrogen (NOmax) contains 0.09% v/v nitric oxide (NO) and 99.92% v/v nitrogen. Express the strength of nitric oxide in PPM (round to whole number) 3) The ratio strength of a 10mL vial of neostigmine methylsulfate injection USP is 1:1500.Calculate the amount of neostigmine methylsulfate in milligrams contained in the 10mL vial. (Round to the whole number).
