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Suppose we have a cell with a resting membrane potential of -70 mV. The Na+ concentrations in the ECF and ICF are as follows: [Na+]ECF = 50 mM and [Na+]ICF = 50 mM. (a) Which direction (into or out of the cell) will Na+ flow if acted on only by its concentration force? Which direction will Na+ flow if acted on only by its electrical force? (b) Under these conditions, what is the equilibrium potential for Na+? (c) If we increase permeability to Na+ (by opening up a pathway in the membrane,) where will Na+ move and why? (d) How will this change Vm? Is this depolarization or hyperpolarization? (e) Please draw a figure of Vm as a function of time in this scenario

Complete the balanced neutralization equation for the reaction below. Be sure to include the proper phases for all species within the reaction. П + Reset 0₂ C 1 2 3 4 HC₂H₂O₂(aq) + Sr(OH)₂(aq) 2 3 2 3 ■ U 00 Question 52 of 70 ■ O LO 5 6 + ☐6 ²+ 3+ 2+ 7 8 9 07 ☐8 H 4+ U 0 (s) (1) (g) (aq) Sr 口。 • x H₂O Delete Submit +

The first goal is to make the oxalic acid standard solution.  You measure 1.5232 g of oxalic acid on an analytical balance, add it to a 250-mL volumetric flask and add deionized H2O to a final volume of 250.0 mL.   Molar mass of H2C2O4•2H2O = 126.07 g/mol   Mass of H2C2O4•2H2O = 1.5232g what is the Number of moles of H2C2O4•2H2O?

The first goal is to make the oxalic acid standard solution.  You measure 1.5232 g of oxalic acid on an analytical balance, add it to a 250-mL volumetric flask and add deionized H2O to a final volume of 250.0 mL.   Molar mass of H2C2O4•2H2O = 126.07 g/mol   Mass of H2C2O4•2H2O = 1.5232g  Volume of H2C2O4•2H2O  solution = 250.0mL    What is the Molarity H2C2O4 standard solution ?

How does Cr3P2(s) break up in solution? Write subscripts and superscripts as normal numbers and do not include spaces in your answer. Do not include states like (aq) or "1" in front of single atoms or charges. For example, the answer for NiCl3(s) would be Ni3++3Cl-  For example, the answer for Sb3(PO4)5(s) would be 3Sb5++5PO43-  Possibly relevant polyatomic ions: CN-,OH-, NO3-, NO2-, ClO3-, ClO4-, CO32-, SO42-, CrO42-, Cr2O72-, PO43-, PO33- Screen Reader User: For example, the answer for NiCl3(s) would be Ni3++3Cl minus  For example, the answer for Sb3(P O4)5(s) would be 3Sb5++5PO43 minus  Possibly relevant polyatomic ions: CN minus,O H minus, N O3 1 minus, N O2 1 minus, Cl O3 1 minus, Cl O4 1 minus, C O3 2 minus, S O4 2 minus, Cr O4 2 minus, Cr2 O7 2 minus, P O4 3 minus, P O3 3 minus   Question 10 options:

4. This question is related to chemical potential in a solution and how it relates to physical properties. a. What is the relationship between the boiling point of a dilute solution vs. that of the pure liquid? Provide an explanation for this relationship based on thermodynamics. b. Calculate the boiling point of a solution of 0.5 mol glucose + 5.5 mol water. A,Hvap,H20 = 40.7 kJ/mol over the relevant temperature range (i.e., A,Hvap,H20 İs not a function of temperature). What is the relationship between the freezing point of a dilute solution vs. that of the pure liquid? Provide an explanation for this relationship based on thermodynamics. d. If the temperature is increased in a saturated solution of A in equilibrium with solid A, what will you observe? Give a thermodynamic explanation for this (based on chemical potential and mole fraction) С.

The freezing point of cyclohexane is 6.50 °C. A solution is prepared by dissolving 0.5580g of an unknown solute in 33.50 g cyclohexane. The freezing point of the solution is 4.32 °C. Calculate the molar mass of the unknown solute. Kf for cyclohexane is 20.0 °C.kg/mole. (show work)

Pls help ASAP.

Oxidation half-reaction for Fe(s) 2 H+ (aq) ->Fe2+ (aq) + H2 (g) Express your answer as a chemical equation. Identify all of the phases in your answer. ΑΣφ а а ха х хь b b 2H (аq) + е —Н,(g) Previous Answers Request Answer Submit X Incorrect; Try Again; 5 attempts remaining 1L

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A 500-mg tablet of commercial vitamin C tablet was dissolved in 50 mL water, treated with excess KI solution and 3 drops of starch solution. The solution required 4.8 mL of 0.05 M KIO3 to reach the endpoint. Calculate the % by weight of vitamin C in the tablet. (Molar mass of vitamin C = 172.16 g mol-1)   IO3‐ + 5 I‐ + 6 H+ → 3 I2 + 3 H2O (1) I2 + C6H8O6 → C6H8O6* + 2 H+ + 2 I‐ (2) I2 + starch → (I2 - starch) (deep blue color) (3)   *oxidized product of vitamin C

An anion has an equilibrium potential of -40 mV. What direction are the chemical and electrical forces acting on the anion at the resting membrane potential (-70 mV)? A) Both the chemical and electrical forces are directed out of the cell. B) The chemical force is directed out of the cell and the electrical force is directed into the cell. C) The chemical force is directed into the cell and the electrical force is directed out of the cell. D) There is insufficient information to answer this question. E) Both the chemical and electrical forces are directed into the cell.

Copper(II) sulfate solutions Reaction quotient (Q) Cell potential (mV) 1 Mand 0.5 M 0.5 8.8 1 M and 0.1 M 0.1 29.4 1 M and 0.05 M 0.05 38.3 1 M and 0.01 M 0.01 58.0 1 M and 0.001 M 0.001 87.5 Slope -29.08 Unknown cell potential (mV) 32.8 Concentration of unknown (M)

5) The solubility of BaCO3 is 24 mg/L at room temperature. a. What is the molar solubility and the Ksp of barium carbonate? b. The carbonate ion can react with water as follows: CO3² (aq) + H₂O (1) HCO3 (aq) + OH- (aq) Kb = 2.1 x 10-4 Write the reaction out from part a, add the two reactions together, and calculate the new K of the combined reaction. C. Using your K from part b, find the solubility of BaCO3 when the reaction in part b is also considered. Did the solubility increase or decrease from part a? Explain using Le Chatelier's Principle.

Heat of Neutralization Reaction between a Strong Acid and a Strong Base In calculating the mass of water in the mixture, assume that the volume of the solution is mainly from water and that the volume of HCl and NaOH are negligible. Also, assume that the density of water is 1 g/mL.  volume of HCl solution: 100ml volume of NaOH solution:100 ml total volume of mixture: 200ml mass of water in the mixture:200g initial temperature of water:20°c final temperature of water:23.41°c qwater? qreaction? molarity of HCl solution: molarity of NaOH solution moles of HCl: moles of NaOH: limiting reactant: moles of limiting reactant Δ?reaction:

A concentration cell is constructed having Zn elelctrodes in two ZnSO4 solutions A and B. At 25°C, the osmotic pressure of the two solutions are 56.3 atm and 0.563 atm, respectively. Calculate the Ecell, assuming no ion pair formation. Pi= iMRT

Copper (II) acetate solution (Solution AI) Prepare 100.0 mL of ~0.1250 M copper (II) acetate solution from solid copper (II) acetate monohydrate. Refer to background information in making a solution from a solid. Tare a small (~50.0 mL) beaker and weigh the required amount of Cu(CH3COO)2•H2O into it. The exact mass is recorded in the Lab Data section below. Base subsequent calculations on this amount. Add ~25 mL of distilled water to the beaker. Swirl and stir gently with a glass stirring rod in the beaker to help dissolve the solid. This solid dissolves slowly and tends to foam when solving. Minimize the bubbles that may form by minimizing the agitation to the solution. Dissolve as much of the solid as you can in the beaker before transferring it to the volumetric flask. Rinse the beaker with distilled water and add this to the volumetric flask. When all the solid is dissolved and in the volumetric flask, fill it to the mark, stopper it and invert several times to mix the solution.…

The electrical conductivity of 3 different solutions in 3 different beakers were measured using a lightbulb. In terms of intensity (brightness) of the light bulb: beaker 3 > beaker 1 > beaker 2. Assuming equal solution concentrations, what could be the possible identities of the solutions in each of the beakers?

A sample (50 mL) of a bottled water was added to a 100 mL volumetric flask and then diluted to the mark. From this stock solution, 50 mL was taken, added to a 100 mL volumetric flask and diluted to the mark. Final concentration of the serial dilution: 587.7161ppm. 1. what is the concentration in the original bottle (ppm)

What is the standard state Gibbs Free energy (ΔG°), in kilojoules (kJ), for this reaction: Pb2+(aq) +Mg(s) <---> Pb(s) + Mg2+(aq) Use attached Table

Draw the membrane voltage changes that occur during a typical action potential. Make sure to label the resting membrane voltage (VR), equilibrium potential of Na+ (ENa+) and K+ (Ek+), and the action potential threshold (T). Label the following phases of the action potential: Resting Potential, Rising Phase, Falling Phase, Undershoot, and Return to Resting Potential. Assume the following ion concentrations: Inside the cell: 10 mM Na+; 100 mM K+ Outside the cell: 100 mM Na+; 10 mM K+ Relative Conductance of Nat: 1; Relative Conductance of K+: 9