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- In the Analytical Chemistry laboratory, one of the B.Sc student Ms. Fatma wanted to analyze the presence of Iron(II) ion in the water samples collected from Sohar Industrial Area in the Sultanate of Oman and analyzed by Spectrophotometric method. (1) 250.00 mL of this water sample (Solution A) known to contain unknown amount of FeSO4. She has diluted Solution A by a dilution factor 10 to make 250.00 mL solution, which she labeled Solution B. Using Spectrophotometer, she has measured the absorbance value (0.642) for Solution B at 508 nm using 1.00 cm cell (cuvet). The molar absorptivity value for Fe2* ion at 508 nm is ɛ508 = 30.8 M-1cm1. (i) What volume of the solution A did she require to make the 250.00 mL of Solution В? (ii) in (i)? What instrument should she use to transfer the volume of the Solution A calculated (ii) Concentration of FeSO4 in Solution B. (iv) Concentration of FeSO4 in Solution A. Mass of FeSO4 in Solution A (Show your calculation) (v)6. _(6a)_ 2CUSO4. + 4NaOH » CH:COOH ±_(6b)__ + 2NA2SO4 + HzO(i) (ii) (iii) (iv) 'I OMe HO H g H N Me Br SnMe3 OSiMe3 CHO OH NaNH, NH3 (1) Phl, Pd(PPH3)4 THF, reflux 1. Ph3P=CMe2 2. "Bu4NF 3. H30 + CH₂12, Zn C C₂H₂NO D C₁1H₁1N E C10H16O F C15H26O2
- AaBbCcDd AaBbCcDd AaBbC AaBbCct AaB AaBbCcD 1 Normal 1 No Spac... Heading 1 Heading 2 Title Subtitle 1 Styles Name HHHHH ||||| H-C-C=C-C-C-H | H || HH Name H H-C-H C=C F -H —H H C 1 B. H H Name H H H H1C C H Η Η Η Η Η Η | | | | | | H-C₁-C₂-C₂-C-C-C-H II HH H H-C-H H -H y Find ✓ Replace Select Editing 14°C Cloudy A Dictate Voice F FooVoltmeter Ag(s) + Zn2*(aq) → Ag2*(aq) + Zn(s) Zn(s), Ag(s) Ag*(aq) + Zn2*(aq) + 3e¯→ AgZn(s) Ag*(aq) + Zn(s) –→ Ag (s) + Zn2*(aq) + e 2Ag*(aq) + Zn(s) → 2Ag (s) + Zn²+(aq) 1.0 M Zn2+(aq) 1.0 M Ag*(aq) 4. CLEAR ALL Standard reduction potentials for the half-reactions associated with the electrochemical cell shown above are given in the table below. Half-Reaction E°(V) Ag*(aq) + e-→ Ag(s) +0.80 Zn2+(aq) + 2e-→ Zn(s) -0.76 Which of the following is the net ionic equation for the overall reaction that occurs as the cell operates?C Solubility of potassium nitrate in water Sample calculation of the solubility (show work for trial 1): Trial Solubility of KNO3 | [g KNO3/100g H20.] = || ||| IV
- (а) 2103 (ад) + 10 Cu" (aq) + 10 н"(ад) — 10 Cu"** (ag) + la (ag) + 5 H-0() O P() | Cut (ag), Cu?* (аq) || IOз (ад), н* (аq), I (ag) | Pt(s) O Pel(o) | Cu* (ag), IOз (ад), н* (аg) || Cu?* (ag), I, (ag) | Pt(8) O Pt(s) | IO3 (ag), H† (aq), I2 (aq) || Cu* (aq), Cu²+ (aq) | Pt(s) О Pe(6) | Cu?* (ag), I3(ag) || Cu" (аg), 10; (аg), н* (ад) | Pt() (b) Zn(s) + 2 Ag* (aq) = Zn²+ (aq) + 2 Ag(s) O Zn(s) | Zn²+ Zn(s) | Ag* (ag) || Zn²+ (aq) | Ag(s) O Ag(s) | Ag* (aq) || Zn²+ (ag) | Zn(s) O Ag(s) | Zn²+ (aq) || Ag* (aq) | Zn(s) (aq) || Ag*(aq) | Ag(s) (с) НаО(ад) + 2 H* (аq) + 2 е — 2 H:0() E° = 1.78 V Оэ (9) + 2 H* (ад) + 2 е НаОz(аg) Е 3 0.68 V O Pt(s) | O2(g) | H2O2 (aq), H* (aq) || H2O2 (ag), H* (ag) | Pt(s) O Pt(s) | H2O2 (ag), H* (ag) || 02(9) | H2O2 (aq), H* (aq) | Pt(s) O Pt(s) | H2O2 (aq) | O2(9) || H† (aq) | Pt(s) O Pt(s) | H2O2(aq) | Pt(s) (d) Mn'* (aq) +2 е — Mn(s) Е 3D - 1.18 V Fe+ (aq) + 3 e → Fe(s) Е 3D -0.036V O Mn(s) | Mn²+ (ag) || Fe*+ (aq) | Fe(s) O Fe(8) | Mn²+ (aq) || Fe* (aq)…The Nernst-Planck equation (shown below) describes the motion of a charged chemical species in a fluid. dC; z,FC; dv J; = - D; dx RT dx' What are the units for the ion flux J, where: zis the valence state of the ion (unitless) C is the concentration (mol/m³) Fis the Faraday constant (Coulomb/mol) Ris the ideal gas constant (kg m²/(s² mol °K)) Tis the temperature (K) dCi/dx is the concentration gradient (mol/m*) dV/dx is the electric potential gradient (V/m) D; is the diffusion coefficient (m²/s) Note that Coulomb is a unit of charge and V is volts where 1 V= 1 Joule/Coulomb)A clinical chemist obtained the following data for the alcohol content of a sample of blood: % C,H OH: o.084, 0.089, and o.079. Calculate the 95% confi- dence interval for the mean assuming that (a) the three results obtained are the only indication of the precision of the method and that (b), from previous