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- 9. The molar conductivity values at infinite dilution, in units of Sm?mol1, of NHẠCI, NaCl and N2OH are 1.497 x 10², 1.2645 x 10² and 2.478 x 10², respectively. (a) Calculate the molar conductivity at infinite dilution of NH4OH. (b) The molar conductivity of 0.0100 moldm3 NH,OH is 1.13 x 103 Sm?mol. What is the degree of dissociation and the dissociation constant, Kp, of 0.0100 moldm3 NHẠOH?1- Calculate I (ionic strength) for a solution that is 0.5 molal in KCI and 0.2 molal in K₂Cr₂O7. 2- 1-When A = 1.05 × 10³ m², C(HCI) = 10.0 mol m³, 1=0.01 A for 200 s, x was measured to be 0.17 m. Calculate t (H¹) 3- Calculate the molar conductivities (A) of KCI solution (0.1 mol L¹), if the conductivity of this solution at 25°C is 0.012896 ¹cm¹. 4- Calculate the Molar conductivity of H (..).The lonic Mobilities of H* ions (u) is -36.23 x10*¹ cm² V¹s¹Determine the activity coefficients and effective concentrations (activities) of Na+ and Ca2+ ions in an aqueous solution having the following composition: [Ca2+] = 3.25x 10-3 M; [Na+] = 0.96x 10-3 M; [HCO3-] = 5.75x 10-3 M; [SO42-] = 0.89x 10-3 M. (Note: Solvated ionic radii are: a(HCO3-) = a(SO42-) = 4 Å; a(Ca+) = 6 Å)
- Hydroxyapatite, Ca0(PO)(OH)2,has a solubility constant of Ksp 2.34 x 10-59, and dissociates according to Са (РОд),ОН),(8) — 10Са** (аq) + 6РО (аq) + 2ОН (aq) 4 Solid hydroxyapatite is dissolved in water to form a saturated solution. What is the concentration of Ca2 in this solution if [OH-is fixed at 8.00 x 10-6 M?1. Part A Solution temperature = 24 °C Conductivity of instrument grade water = 1.043 uScm! Conductivity of deionised water = 1.74 µScm! Conductivity of tap water = 330 μScml On the basis of data above comment on conditions of the different water grades. 2. The experimental data for electrolytes in Part B are given below: Electrolyte c (M) K (ms.cm') HC1 0.01 5.06 KCI 0.01 1.415 NaCl 0.01 1.236 CaCl2 0.01 2.30 КОН 0.01 2.29 CH3OH 0.01 0.003 K2SO4 0.01 2.65 Calculate molar conductivity A of each electrolyte solution in Sm/mol above. Correct for the conductivity of deionized water.Calculate the ionization constant of propanoic acid (CH3CH2COOH) using the following data: Parameter Value pH 4.51 1.18 x 105 µS-cm1·M-1 3.866 x 105 uS-cm-1·M-1 Molar conductivity of HZ, Am Conductivity at infinite dilution, Ao To calculate the ionization constant, calculate the following: (report all answers in 3 SF) 1. fraction of propanoic acid ionized: 2. equilibrium concentrations of the conjugate base of propanoic acid and hydronium ion: M 3. initial concentration of the acid: M 4. ionization constant:
- 3-3. Piché and Larachi (2007) proposed the following reaction for the oxidation of polysulfide ions (S,2 where n can be any value >2) to form thiosulfate ions (S2O32-) and colloidal sulfur (Sg): 3 S8 S2-+02 S2O32 + 8 (a) Forn 6, write expressions for rs,0,2- and rse in terms of rs2-, if all the rates are given in units of mol/L h. (b) Repeat part a, if the rates are in mg/L-h of the respective chemicals; designate these rates as r'. (c) Repeat part a, if the rates are in mg S/L h; designate these rates as r".A sample containing iron is approximately 99.0% w/w Fe. Using ammonia, iron is precipitated as Fe (OH)3 which is ignited to Fe203. (a) What is the gravimetric factor for analyte Fe (AW=55.85 g/mol) and precipitate Fe203 (FW=159.69 g/mol)? (b) What mass of sample is needed to ensure that the Fe203 precipitate would weigh at least 1.00 g?Q 1. At 291 K, the equivalent conductivities at infinite dilution of HCI NaCl and CH3COONA are 369.3, 101.7 and 1.7 S cm2eq-1 respectively. If equivalent conductivity of centinormal solution of acetic acid is 14.3 S cmzeq 1, [H+] in solution of acetic acid is Xx10 . Calculate of Value of X?
- Consider a soil with negligible ionic strength (activity = concentration), constant pH of 7.7, (Ca2+) = 10*3.2 M and total P = 104.4 M Given the dissolution reaction of brushite is written: CaHPO4-2H2O(s) + H* (aq) 2 Ca2 "(aq) + H2PO4¯ (aq) + 2H2O .and that H3PO4 has a pka2 of 7.21, calculate log(IAP) (same as log(Q)) of the reaction, and save your answer for the next question. Your Answer:The limiting molar conductivities of Nal, NaNO3, and AGNO3 are 12.69 mS m² mol-1, 12.16 mS m² mol-1 and 13.34 ms m? mol-1, respectively (all at 25 °C). What is the limiting molar conductivity of AgI at this temperature?II 2016) as uid. I 2016) stics is ositive. sitiva 9. The protecting power of lyophilic colloidal sol is expressed in terms of (a) coagulation value (b) gold number (c) critical micelle concentration (d) oxidation number BVP ³h, 10. If x is amount of adsorbate and m is amount of adsorbent, which of the foll (d) (a)