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- O 11:E9 5310107675680311588_2 50.What is the pH of a 0.10 M solution of trimethylamine (pKs = 4.13)? 17 51.How would you calculate K, for the formate ion, given that the K, for formic acid is 1.8 x 10-4? (Kw=1.0x 10-14) K = K, x Kw b. K = Kw/K, c. K, = K/K d. K = Kw + Ka e. K = Kw - K, a. IIcalculate 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. %3DExplain the would be effects (if any) of the following considerations: a. Water sample was made to stand overnight before analysis b. MnSO4 was added and the solution was made to stand overnight before the analysis
- 1. What are some precautions that should be observed when collecting samples for DO determination, to ensure the amount of oxygen in the sample is representative of the DO at the site? 2. The standard Winkler method uses sodium iodide and sodium azide to be added at the same time as sodium hydroxide. What is the purpose of sodium azide? 3. Chlorinated tap water contains both chlorine (Cl2) and hypochlorite (OCl-) does the presence of these species affect DO results? Write equations to represent their individual interactions. 4. What effect would nitrate (NO2-), a common constituent of polluted water, have on DO results? Write a balanced equation for its interaction. 5. What is meant by seawater intrusion in drinking water supplies? How does this happen? What are some consequences of these phenomena?16.The following is a solubility product expression for Ca3(PO4)2: Ksp= Group of answer choices A, [Ca32+][(PO43–)2] B, [Ca2+][2PO43–] C, [3Ca2+]3[2PO43–]2 D, [Ca3+]2[PO42–]3 E, [Ca2+]3[PO43–]2What's More Activity 1. Strength of IMFA and Physical Properties of Covalent Compounds Ror each pair of molecules, identify the one with the higher boiling point (BP), melting noint (MP), viscosity (V), surface tension (ST) and vapor pressure (VP). Briefly explain your choice. BP MP LS H--H H. Methane, CH4 carbon tetrachloride, CC14 S. Dihydrogen sulfide, H2S H. H water, H2O H-0-5-H H-C-C-Ö-H H. Methanol, CH3OH H ethanol, CH3CH2OH H. H. H-C-C=ÖH H-C-C-C-H H. Acetic acid, CH,COOH H. acetone, CH,OCH3 Adapted from Punzalan and Monserat (2016)
- 1. IOn selective electrode utilizing pCO2 is used fro the measurement of the electrolyte a. Phoisphate b. bicarbonate c. Magnesium d. chloride e. sodium 2. The confirmatory method for the measurement of Calcium and Magnesium A. Turbidimetry b. FES c. none d. colorimtery e. AAS 3. the electrolyte is found as component of phospholipids, nucleic acids, creative phosphate and ATP a. magnesium b. calcium c. phosphate d. bicarbonate e. chlorideCan we use colorimetry to study all chemical reactions? Explain your answer.SPOT TEST OBSERVATION MATRIX Reagent K.Cro, KSCN NH,OH DMG HCI H,SO, Yellow Clear Clear precipitate No precipitate precipitate No precipitate No reaction precipitate Clear White White Pb(NO,), Orange Dark red Faint orange Clear Clear Clear Fe(NO,), precipitate No precipitate precipitate No reaction No precipitate No precipitate Clear precipitate No precipitate No reaction Yellow no Clear Pink solution Cream White Ni(NO,), solution precipitate No reaction Reddish White Faintly milky white precipitate Clear White No precipitate precipitate precipitate Clear AGNO brownish precipitate precipitate • Clear light yellow No precipitate No precipitate No reaction No precipitate solution Opaque Clear Clear Clear White Ba(NO,), precipitate Undereach reagentindicate whathappened (if anything) when mixed with the metal ion shown on the left. Write balanced reactions to representwhat happenedineach spottest.
- 1. What is the ratio of water drops to EDTA if 2 drops of EDTA is needed to change the color of 20 drops of water with unknown hardness? A. 10B. 5C. 0.1D. 1.0 2. The higher the value of chemical oxygen demand indicates the higher organic pollution in the water sample. A. True B. False 3. COD measures the total amount of O2 needed to oxidize all organic matter into CO2 and water. A. True B. FalseWhich of the following DOES NOT meet the requirement for primary standards? a. Large molar mass b. High affinity towards water c. High purity d. Soluble in titration mediumhelp with Part B Please. 5. Compare the values of Keq for each of the five solutions: a. Are any of the values outside the sample standard deviation for the set? b. Does the value of the equilibrium constant change when the concentration of either the reactants or products is altered? Why or why not? Explain this based on your calculations of Keq: c. What caused variation (three reasons) in your values of Keq? NOTE: the standard deviation is 3.9x102 The procedure is in the images Data: Unknown solution Equilibrium concentration of {FeNCS2+} in unknown solution(M) Equilibrium concentration [Fe3+](M) Equilibrium concentration [SCN-](M) Keq 1 3.7x10-5 9.6x10-4 1.6x10-4 2.4x102 2 6.2x10-5 9.4x10-4 3.4x10-4 1.9x102 3 1.1x10-4 8.9x10-4 4.9x10-4 2.5x102 4 1.1x10-4 8.9x10-4 6.9x10-4 1.8x102 5 1.8x10-4 8.2x10-4 8.2x10-4 2.7x102