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- ppb of Sn^2+ in 10^9 % Sn(NO3)2Can precipitation give a confirmatory result on Group V cations: K, Na, and NH4?Chemistry In a whole-cell patch-clamp experiment at 32 degrees C, the intracellular solution contains 16 mM NaCl, 150 mM K-gluconate, and 1µM Ca(NO3)2, and the extracellular solution contains 150 mM NaCl, 3 mM KCI, 25 mM NaHCO3, 2 mM MgCl2, and 1.5 mM CaCl2. The below graph is a current-voltage (I-V) curve generated by measuring the current flux through a specific ion channel over a range of voltages (-100 to +40mV). What is the reversal potential of this current? 1000 800 - 600 400 – 200 – T T -100 -80 -60 -40 -20 20 40 -200 - -400 - pA
- POTASSIUM PERMANGANATE AND SULFURIC ACID Place 10 drops of 0.1M potassium permanganate solution in a test tube. Add 2 drops of 6M sulfuric acid. Add drop by drop 0.1M sodium bisulfite solution until a definite color change is observed. Observations: Balanced chemical equation: H2SO4(aq) + 4KMnO4(aq) + 10NaHSO3(aq) → 6H2O(l) + 2K2SO4(aq) + 4MnSO4(aq) + 5Na2SO4(aq) What substance is responsible for the color change?Balance the equation and choose the coefficient of the (?) Na2CO3 + HCl → NaCl + H20 + CO2 -> (x)NA2CO3 + (?)HCl → (x)NaCl + (x)H20 + (x)CO2(c) 0.04 molar solution of NaCl is filled in a conductance cell at 25°C that showed a resistance of 175 ohms. The specific conductance of the NaCl solution used is 2.77 x 102 mho cm. The same cell containing 0.02 molar KCl solution gave an electrical resistance of 424 ohms. What will be the specific and equivalent conductance of the KCI solution?
- Calculate the standard enthalpy of formation of NOCI of the reaction Nz+ 1/2 One) + 1/2 Cla NOCI ( from the enthalpy of formation of NO given in 1/2 Nae + 1/2 Oza→ NO) 2NOCI AH = 90.25 KJ/mol AH = 75.5 KJ/mol - 2NO) + Clue)Using the following formula, calculate the electrical and chemical potentials for calcium ions across a cell membrane when the internal concentration of calcium ions is 0.002 mM and the external concentration is 0.0024 Mand the membrane potential is -60 mV. R= 8.314 J K mol1: F=96,485 JV1 mol1:T = 37° C. ApCa = RT In ([Ca"Jin/[Ca"]out) + ZFAY Feel free to work the problem on a scrap sheet, and then fill in the answers to the questions below. Express your answers to the nearest tenth of a unit. The chemical potential of calcium ions is kJ/mol. The electrical potential of calcium ions is kJ/mol. The electrochemical potential of calcium ions is kJ/mol.A fertilizer railroad car carrying 34,300 gallons of commercialaqueous ammonia (30% ammonia by mass)tips over and spills. The density of the aqueous ammoniasolution is 0.88 g>cm3. What mass of citric acid,C(OH)(COOH)(CH2COOH)2, (which contains three acidicprotons) is required to neutralize the spill? 1 gallon = 3.785 L.
- Standardisation of the Permanganate Solution 5 C2O42-(aq) + 2 MnO4-(aq) + 16 H+(aq) → 10 CO2(g) + 2 Mn2+(aq) + 8 H2O Calculate the number of moles Na2C2O4 used in each of the three samples. Calculate the concentration of potassium permanganate in the standard solution for each of the three titrations you performed. Average the titration results and determine the concentration of Permanganate in the Standard Solution Recorded mass of sodium oxalate (Na2C2O4) in grams (g): Sample Mass M1 0.1134 M2 0.1136 M3 0.1124 M4 0.1100 Recorded initial- and final volume of Potassium Permanganate after titration: Sample Initial Volume in mL (Vi) Final Volume in mL (Vf) Total volume of KMnO4 used in mL. (Vf – Vi) 1 6.5mL 23.7mL 17.2mL 2 23.7mL 40.5mL 16.8mL 3 17.7mL 34.8mL 17.1mL 4 3.0mL 19.4mL 16.4mLThe alkalinity of a river was determined to be 5 x 10-3 mol H+/L and its pH is 8. Calculate the concentrations of CO32- and HCO3- in the river.Although sulphuric acid is a strong electrolyte, an aqueous solution of H2SO4 contains more HSO42- ions, true or false? Justify your answer.