Gi Prelab Final

Gb6cd_i-5c7IV_IVquz8U4UO2epq7z4kBnpYZ5iA/edit > 2 ons Help Calibri - - [12] + B 7 U . UA 2 3 ge 2: Problems of Water and Air Quality Questions 1. Why is it recommended to have a carbon monoxide detector on each floor of a home? Et © ª @ E- E 4-B-E- 2. What impact would the increased use of electric vehicles have on environmental damage caused by acid rain? 3. Why is ground level ozone most likely to reach its highest concentrations on hot, sunny days during periods of heavy traffic in large cities? Page 3: More Air Pollution Issues: Questions 4. The COVID-19 pandemic forced many people to work from home for extended periods. During these periods, many cities reported unusually low levels of smog. Suggest an explanation for this observation. Page 4: Water Pollution: Questions 5. Explain how ozone can be both harmful and beneficial. 6. India relies heavily on burning coal to generate electricity. How does India's reliance on coal contribute to the poor air quality experienced in many of…

Adsorption exp erim ent Reaction between FeS and HCl: FeS+2HC1-FeCl2+H2S Reaction on filtration sheet: H2S+Pb(CH:Co0)2-PbS+2CH:COOH STEP1 Put some FeS particles into a big tube. Add1 or 2 mL of 18% HCl solution onto FeS particles. Immediately close the tube with Pb(NO3)2 or Pb(CH:COO)2 immersed filtration sheet. 1. Why filtration sheet turned black in step1? STEP2 Put some FeS particles into a big tube. Fix the "glass funnel" (glass pipette) to the tube after adding HCl solution. Close the outlet of funnel with Pb(NO3)2 or Pb(CH COO)2 immersed filtration sheet. 1. Why filtration sheet didn't turn black in step2 ?

4- A sample containing H2C204 had a purity equal to 90.50% (w/w). An unknown mass of this sample was dissolved in water and transferred to a 50.00 mL flask. An aliquot of 25.00 mL was transferred to an erlenmeyer flask and 50.00 mL of a 0.2000 mol L^-1 NaOH solution were added. %3 Excess NaOH was titrated with 0.09000 mol L^-1 HCI solution using 2.000 mL. Calculate the mass (g) of the sample used. Data: H = 1.008 C= 12.01 O = 16.00

Suzy Baker What two chemicals are incompatible with copper metal (used in Expt 5)? (refer to ACS Safety in the Academic Chemistry Laboratories, Vol. 1): [use the answer format= ans 1, ans 2]

A solution contains 0.10 M Sr(NO3)₂ and 0.20 M Bi(NO3)₂. When solid Na AsO is added to the solution a precipitate forms. What concentration of AsO 3 maintains maximum separation of Sr²+ and Bi³+? 4 Ksp of Sr₂(ASO)₂ = 4.29 x 10-1⁹ and BIASO = 4.43 x 10-1⁰ 4 2

M (2022-23) Unit 1: Mole Concept, Unit 4 (FR) (Version 2) Assessment: Chemical Reactions 0.90 0.80- 0.70- 3 0.60 0.50- 0.40- 0.30- Absorbance 2. To spectrophotometrically determine the mass percent of cobalt in an ore containing cobalt and some inert materials, solutions with known [Co²+] are prepared and the absorbance of each of the solutions is measured at the wavelength of optimum absorbance. The data are used to create a calibration plot, shown below. 0.20 0.10- 0.00+ ㅏ 0.005 0.010 34 0.015 Concentration (M) .04 co₂ 100- pertoc A 0.630 g sample of the ore is completely dissolved in concentrated HNO3(aq). The mixture is diluted with water to a final volume of 50.00 mL. Assume that all the cobalt in the ore sample is converted to Co²+ (aq). (a) What is the [Co²+] in the solution if the absorbance of a sample of the solution is 0.74 ? (b) Calculate the number of moles of Co²+ (aq) in the 50.00 mL solution. (c) Calculate the mass percent of Co in the 0.630 g sample of the ore. Answer…

2. In one gravimetric analysis, the aluminum in a 1.2g sample of impure NHAI(SO4)2 was precipitate as hydrous ALO3.XH2O. The precipitate was filtered and ignited at 1000 °C to give anhydrous Al2O3 which weighed 0.1798g. Calculate the % Al inthe sample. 3. A sample of 0.4500g impure potassium chloride was dissolved in water treated with excess silver nitrate solution. 0.8402 g of silver chloride was precipitated. What is the percentage of potassium chloride in the sample?

nent-delivery/start/4573065653?action=onresume&submissionld=484459992 H 2.1 Li Be 1.0 1.5 B N D 1.5 2.5 3.0 3.5 4.0 Na Mg 0.9 1.2 Al Si PS CI 1.5 1.8 2.1 3.5 3.0 K Ca Sc Tiv Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br 0.8 1.0 1.3 1.5 1.6 1.6 1.5 1.8 1.9 1.8 1.9 1.6 1.6 1.8 2.0 2.4 2.8 Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te 0.8 1.0 1.2 1.4 1.6 1.8 1.9 2.2 2.2 2.2 1.9 1.71.7 1.8 1.9 2.1 2.5 Hf Ta w ReOs Ir Pt Au Hg TI Pb Bi Po At 1.3 1.5 1.7 1.9 2.2 2.2 2.2 2.4 1.9 1.8 1.9 1.9 2.0 Cs Ba 0.7 0.9 2.2 Fr Ra 0.7 0.9 Using the above table of electronegatives, classify the O-H bond in water as either pure covalent, polar covalent or ionic. (Electronegativity difference, A EN > 1.7 = ionic, AEN 0.4-1.7 = polar covalent, and AEN 女 @ 23 24 % 4. e r t y a d. C 1, 41

7-11. Limestone consists mainly of the mineral calcite, CaCO3. The carbonate content of 0.541 3 g of powdered limestone was measured by suspending the powder in water, adding 10.00 mL of 1.396 M HCI, and heating to dissolve the solid and expel CO2: CACO3 (s) +2H* → Ca²* +CO,T +H2O Calcium carbonate FM 100.086 The excess acid required 39.96 mL of 0.100 4 M NaOH for complete titration to a phenolphthalein end point. Find the weight percent of calcite in the limestone.

4. determine the amount in mg of the amount of Ag present from ICP mass digested: 1.0821g/L dilution of 10ml stock solution to 100ml volumetric flask X=0.98 (intensity)

A 0.0715 g sample of a material was analyzed for thiourea (CS(NH2)2, MM = 76.12). It was found to consume 12.34 mL of 0.00543 M KBrO3 based on the reaction below:          3CS(NH2)2 + 4BrO3-  +  3H2O ⇄ 3CO(NH2)2  +  3SO42-  +  4Br-  +  6H+ Calculate the mass of thiourea found in the sample. Group of answer choices 95.1 mg 6.80 mg 3.83 mg 0.0535 mg

1. Straight lime softening A groundwater was analyzed and found to have the following composition (all concentrations are as CaCO): Estimate the lime dose (in mg 1.) required to soften the water. HCO 155mg/1 Ca 210 mg Mg-15mg/1 Alk.-260 ml Temp-10C 2. Excess lime softening A groundwater was analyzed and found to have the following composition (all concentrations are as CaCO)). Estimate the lime dose (in mg/L.) required to soften the water.. H:CO 155mg/1 Ca 180 mg/1 Mg-60mg/1 Alk. -260 mg/1 Temp-10C

mass Br- = 5.32 * 103* 79.904 = 0.4255 g. Os : What concentration Of Fez(SO4)3 (aq) is required for the olution to have [Fe*3 lag)] = 0.32M ? ) 0.16 M. %3D 0.080 M. 0.32 M.

I did an experiment: Molar concentration of Fe (NO3)3=.002                                    Molar concentration of NaSCN= .002 On my 1st trial: Volume of Fe(NO3)3 = 5 mL Moles of Fe3+, initial (mol) = 1 x 10-5 Volume of NaSCN (mL)= 1 mL Moles of SCN-,initial (mol)= 2 x 10-6 Absorbance was .08 Now trying to find Calculation of Kc I already found [FeNCS2+] equilibrium, from calibration curve (mol/L)= 2.25 x 10-5 Now I need to know: 1. moles FeNCS2+ at equilibrium (10mL) (mol) 2. moles Fe3+, reacted (mol) 3. moles Fe3+, equilibrium (mol) 4. [Fe3+] equilibrium, unreacted, 10 mL (mol/L) 5. moles SCN-, reacted (mol) 6. Moles SCN-, equilibrium (mol) 7. [SCN-] equilibrium (unreacted) 10 mL (mol/L) Feel free to just give me the formula to find these. Or to charge me 2 or 3 questions if I asked too much.  Thank you!!!!!!

6-20. A 4.476-g sample of a petroleum product was burned in a tube furnace, and the SO, produced was col- lected in 3% H,O2. Reaction: SO-(g) + H;O, → H,SO4 A 25.00-mL portion of 0.00923 M NaOH was intro- duced into the solution of H,SO,, following which the excess base was back-titrated with 13.33 mL of 0.01007 M HCI. Calculate the parts per million of sulfur in the sample.

The solubility product for Ca3(PO4)2 is written as OK. - Ca' -PO-1 C₂3(PO4)₂ 30 Kap [PO] OK - [Ca²+]³[PO-1² Ksp - ( 3[Ca] 2[PO] KpCas(PO4)2] Ox-3[Ca] [PO] [Ca²+]³[PO³-]² K=[Cas(PO)₂]

Find the amount of NH4CI that must be added to give 0.5 dm3 solution with pH = 4.25? [Kb (NH3) = 1.8 X 10-5] Mw(NH4CI)=53.49 g/mol 152 g 2.3 x 10-3 15.81 g 750.8 g 4.1 g

5 The solubility product constant for Ni₂P₂O7 is 1.7 x 10-13. Calculate Eº for the process 4- Ni₂P₂07 (s) + 4e¯ ⇒ 2Ni(s) + P₂O7

emistry R122 dy Assignment 3 Solubility Equilibria How many grams of Ca3(PO4)2 will dissolve in a) 2.0L of pure water? b) 500 mL of 1.0M Ca(N03)2? %3D Ksp for Ca3(PO4)2 = 2.0 x 10-29 is the [Cr3+] in a saturated solution of Cr(

(d) 3-13. Distis me Jum 4 A method of analysis yields weights for gold that are low by 0.4 mg. Calculate the caused by this uncertainty if the weight of gold in the sample is (a) 900 mg. (c) 150 mg. 1-7. The method described in Problem 3-6 is to be used for the analysis of ores that assay about 1.2% gold. What minimum sample weight should be taken if the relative error resulting from a 0.4-mg loss is not to exceed -0.2%? percent relative error (a) (b) (b) 600 mg. (d) 30 mg. 3-14. Wha stan stam 3-15. Сог mea (b) -0.5%? (a) -0.8%? (c) (d) 1.2%? 3.5 3-8. The color change of a chemical indicator requires an overtitration of 0.04 mL. Calculate the percent relative error if the total volume of titrant is (a) 50.00 mL. (c) 25.0 mL. 3-9. A loss of 0.4 mg of Zn occurs in the course of an analysis to determine that element. Calculate the per- cent relative error due to this loss if the weight of Zn in the sample is (a) 40 mg. (c) 400 mg. 3.1 3.1 (b) 10.0 mL. 3.3 2.5 (d) 40.0 mL. Fo (a (E (b) 175…

Q: The solubility product of Zn(OH)2 at 25oC is 3.0 x 10-6 M3. Calculate the solubility of Zn(OH)2 in water in gdm-3. [Ar: Zn = 65.5; O = 16; H = 1] The Mr for Zn(OH)2 is 99.5. When I multiply it with Ksp, I didn't get the same answer as the given answer which is 0.904 gdm-3.

How many grams of Ca3(P04)2 will dissolve in a) 2.0 L of pure water? b) 500 mL of 1.0M Ca(NO3)2? Ksp for Ca3(PO4)2 = 2.0 x 10-29

A chemist received a radioactive sample that is suspected to contain U, 23U and other elements. The authority wants to know the distribution, qualitative and quantitative composition of the sample. Propose with justifications, ONE Surface analysis technique that can be performed on this sample.

10:07 PM Mon Apr 11 < 88 Q O Exp 7 Prelab - Exp 7 Prelab S22 1020 Unit 1P x Worksheet 15 Acid.x Worksheet 16 Wea x Worksheet 19 Titr. Anatomy 3. A 2.351 g sample of KHP is dissolved in water and titrated with a NaOHo) solution. If 32.02 mL of NaOH is needed to reach the endpoint of the titration. What is the concentration of the NAOH? (aq) (aq) SHOW ALL WORK/SIGNIFICANT FIGURES and MOLE RATIOS. An example calculation of this type is shown on page 4. 1 of 2

Give a detailed description of how these both analytical separation protocol will be employed to recover river bodies from heavy metals and particulate matter. I. Centrifugation II. Chemical precipitation

A solution of Ba(OH)2 was standardized against0.1215 g of primary-standard-grade benzoic acid, C6H5COOH (122.12 g/mol). An end point was observedafter addition of 43.25 mL of base. (a) Calculate the molar concentration of the base. (b) Calculate the standard deviation of the molarconcentration if the standard deviation for themass measurement was ±0.3 mg and that for thevolume measurement was ±0.02 mL. (c) Assuming an error of ±0.3 mg in the mass measurement,calculate the absolute and relative systematicerror in the molar concentration.

please use excel to calculate Fe analysis by ICPMS. 1') Generate a standard curve2') calculate the Fe concentrations in two air samples..

What is the importance of the following analytical methods in chemical analysis? i. UV-vis spectrophotometry ii. HPLC iii. GC

Table 3 - Equilibrium Test Solutions Volume (mL) 2.00 x 103 M Volume (mL) 2.00 x 10-3 M Initial [Fe*] Initial [SCN] Test Volume (mL) 0.1 Μ ΗΝΟ, Tube Fe(NO:); NaSCN M M 1 5.00 5.00 5.00 1.00 4.00 3 5.00 2.00 3.00 4 5.00 3.00 2.00 5 5.00 4.00 1.00 5.00 5.000 Find the concentrations of Fe3+ and SCN- 2.

In the HQS-Mg fluorescence part of Lab 6, a calibration curve is made of fluorescence intensity vs. MgCl2 concentration (M). The standard solutions for the calibration curve were made by mixing a small amount of 0.01 M MgCl2 with some HQS solution. Calculate the concentration of MgCl2 (M) in each of the following standards. Report your concentrations to 3 sig figs. Fluorescence Volume of 0.01 M Volume of 1 mM Concentration of MgCl2 (M) Intensity MgCl2 (mL) HQS (mL) 0.031250902 0.8 100 0.049490754 0.8 50 0.059803507 2 100 0.085834029 3.6 100 Hint: The total volume of each solution is volume of 0.01 M MgCl2 + volume of 1 mM HQS.

+ H (a) CuCN (b) CaCO3 (c) Ag₂CO3 (d) PbBr₂ (e) Y(OH)3 Periodic Table B W Chapter... Supporting Materials Additional Materiala [Ca²+] = 5.2 x 104 M, [CO32- ] = 6.5x 10-6 M * G Please use the values in the resources listed below instead of the textbook values. The following concentrations are found in mixtures of ions in equilibrium with slightly soluble solids. From the concentrations given, calculate Ksp for each of the slightly soluble solids indicated. [Cu] = 1.9x10-10 M, [CN] = 1.9x10-¹0 M [Ag+] = 1.8x10-5 M, [CO32] = 2.7x10-² M [Pb²+] = 1.2x 10-2 M, [Br] = 2.4x10-2 M [Y³+] = 3.5x 10-16 M, [OH-] = 6.6x 10-³ M Constants and Factors №. webassign.net ● F 893 Supplemental Data L C C a Ⓒ + D r

10-11. BaSO, is precipitated from a solution of NazSO4 by slow addition of Ba(NO3)2. Which ion will constitute the primary adsorption layer? A. Na+ B. SO,2- С. Ва2 D. NO, Which ion will constitute the counter ion layer? B. SO,2- A. Na+ С. Ва?+ D. NO3