A) A saturated solution of manganese(II) hydroxide was prepared, and an acid–base titration was performed to determine its Ksp at 25 °C. The endpoint was reached when 55.00 mL of the manganese(II) hydroxide solution was titrated with 2.55 mL of 0.0050 M HCl solution. What is the Ksp of manganese(II) hydroxide?

B) What is the approximate concentration of free Ag⁺ ion at equilibrium when 1.86×10^-2 mol silver nitrate is added to 1.00 L of solution that is 1.330 M in S₂O₃^2-. For [Ag(S₂O₃)₂]^3-, K_f = 2.9×10¹³.

C) What is the approximate concentration of free Cd²⁺ ion at equilibrium when 1.15×10^-2 mol cadmium(II) nitrate is added to 1.00 L of solution that is 1.330 M in CN^-. For [Cd(CN)₄]^2-, K_f = 6.0×10¹⁸.

D) What is the approximate concentration of free Ag⁺ ion at equilibrium when 1.72×10^-2 mol silver nitrate is added to 1.00 L of solution that is 1.330 M in CN^-. For [Ag(CN)₂]^-, K_f = 1.3×10²¹.

(I don't know what needs to be updated? This is the question)

The following are at constant T and P. The conditions described in (a) and (b) below are initial conditions. Calculate Qc and CLEARLY indicate, with an arrow (“?”, or “?”) to which side the reaction must shift in order to attain equilibrium.

(a) A 250.0-mL flask containing 0.0250 mol of NO(g), 0.0100 mol of Cl2(g), and 0.250 mol of

NOCl: 2NO(g) + Cl2(g) ⇌ 2NOCl(g) Kc = 4.6 × 104

(b) A 5.00-L flask containing 35.0 g of NH3, 20.0 g of N2, and 15.5 g of H2:

N2(g) + 3H2(g) ⇌ 2NH3(g) Kc = 0.060

(show work)

DIRECTION OF SHIFT    Value of Qc

(a) __________________ __________

(b) __________________ __________

E. coli asparate transcarbamoylase (ATCase) has a Hill coefficient of 1.7 and Vmax 4.5 uM/min. The definition of Vmax is Kcat * [Etot], where kcat is the rate constant for formation of product. The measured value of kcat for this reaciton, which is determined in the absence of CTP, is 800 1/min. The dissociation constant for the allosteric effector CTP from ATCase is 1 mM. When CTP is bound to ATCase the K(1/2) for asparate is 20 mM; when CTP is not bound to ATCase the K(1/2) for asparate is 5 mM.

a) Calculate what the concentration of total ATCase is under the conditions where Vmax was determined. Calculate how much ATCase is present with CTP bound and how much is present without CTP bound when the CTP concentration is 6 mM. Calculate how much ATCase is present with CTP bound and how much is present without CTP bound when the CTP concentration is 0.3 mM.

1. What are necessary buffer components?

2. Write reaction equations to explain how your acetic acid/sodium acetate buffer reacts with an acid and a base. Why pH does not change? Explain.

3. At which point does a buffer lose its effectiveness? Use your data to determine the buffer capacity of Buffer A and Buffer B. Explain.

no other data provided

8. Determine the calcium carbonate equivalent (CCE) of the following compounds: (amount that has the same neutralizing value as 100 g pure CaCO3) (a) KOH (b) Mg(OH)2 (c) and CaMg(CO3)2.

9. How many grams of limestone with a CaCO3 equivalent of 100% would you need to apply to an acidic soil with 85% exchangeable Al saturation to reduce it to 10%? The CEC of the soil is 12.5cmolc/kg.

10. How many grams of gypsum (CaSO4.2H2O) would you need to reclaim a sodic soil with an exchangeable sodium percentage (ESP) of 80% to reduce to it to 50%? The CEC of the soil is 12.5cmolc/kg.

A 4.2 mol sample of Kr has a volume of 953 mL. How many moles of Kr are in a 4.90 L sample at the same temperature and pressure?

_______mol

A flexible container at an initial volume of 8.15 L contains 8.51 mol of gas. More gas is then added to the container until it reaches a final volume of 11.7 L. Assuming the pressure and temperature of the gas remain constant, calculate the number of moles of gas added to the container.

____________mol

Calculate the volume, in liters, occupied by 1.27 mol of oxygen gas at STP.

__________L

If 1.63 moles of an ideal gas has a pressure of 9.31 atm, and a volume of 38.05 L, what is the temperature of the sample?

__________K

A sample of carbon dioxide is contained in a 500.0 mL flask at 0.924 atm and 19.9 °C. How many molecules of gas are in the sample?

__________molecules

A mixture of He, Ne, and Ar has a pressure of 11.3 atm at 28.0 °C. If the partial pressure of He is 1.39 atm and that of Ar is 3.24 atm, what is the partial pressure of Ne?

___________atm

A 8.15-L container holds a mixture of two gases at 27 °C. The partial pressures of gas A and gas B, respectively, are 0.446 atm and 0.620 atm. If 0.180 mol of a third gas is added with no change in volume or temperature, what will the total pressure become?

_____________atm

From Part A:

Mass of K_xFe(C₂O₄)_y · zH₂O prepared : 5.100 g
Mass of FeCl₃ : 1.60 g

From Part B:

% Potassium in compound : 17.95 %
% Iron (from ion exchange & titration vs. NaOH) : 8.35 %

From Part C:

% Oxlate : 43.97 %

Calculate the % water of hydration :

Calculate the following for Fe³⁺:

Calculate the following for K⁺:

Calculate the following for C₂O₄^2-:

Calculate the following for H₂O

Using your chemical knowledge and literature references (don’t forget to include the references in your lab report and discuss possible sources of errors) answer the questions below:

Enter the simplest formula of the Iron Oxalate Complex Salt:

Now that the formula of the complex salt is known, the percent yield can be determined.

Calculate the moles of FeCl₃ used in preparation:

Calculate the theoretical moles of K_xFe(C₂O₄)_y · zH₂O:

Calculate the actual moles of K_xFe(C₂O₄)_y · zH₂O synthesized:

Calculate the percent yield:

Liquid Propane (C3H8(l)) enters a combustion chamber at 25 degrees C and 1 atm at a rate of 0.4 kg/min where it is mixed and burned with 150% excess air that enters the combustion chamber at 25 degrees C. The heat transfer from the combustion process is 53 kW. Determine (c) the average specific heat at constant pressure of the product gasses, and (d) the temperature of the products of combustion.

Ascorbic acid or Vitamin C, H₂C₆H₆O₆, is a weak diprotic acid. What are the concentrations of H⁺, H₂C₆H₆O_6, HC₆H₆O₆^- and C₆H₆O₆^2- in a 0.10 M aqueous solution of ascorbic acid? For ascorbic acid Ka1=7.9x10^-5 and Ka2= 1.6x10^-12.

1. Draw and label the band diagram for Carbon Monosulfide anion(CS^-)

2. Draw the MO diagram for Carbon Monosulfide anion (Cs^-) and give bond order.

Discuss why the constituents of an aqueous solution can only be separated by evaporation and the concentration of the solute in the solution calculated in % (m/v) and in molarity

You prepare a solution by adding 20.0 g Urea [(NH₂)₂CO] to 125 g water at 25.0^oC & vapor pressure 23.76 torr.

       The solution vapor pressure is 22.67 torr. Calculate the molecular weight of urea.

     X_H2O = ________   moles H₂O = ________    X_solute = ________      moles urea = ________    molar mass = ________

No other data provided

3. The cations on an exchangeable site of a 40 g soil were displaced by repeatedly washing by a salt and found to be 40 mg Ca+2, 11.5 mg Na+1, 39 mg K+1, 12 mg Mg+2, and 9 mg Al+3. The pH of the soil was 5.0. Calculate the CEC (cmolc/kg), percentage base saturation (PBS) and percent acidic saturation (PAC) per kg of the soil.

4. A give soil has a CEC of 12.50 cmol of charge per kg of soil. If 70%, 15%, 10% and 5% of the CECis occupied by Ca+2, K+1, Mg and Na+1 , respectively, calculate the weight (grams) of Ca, K, Mg and Na in the soil.

5. A given soil contains the following colloids: 1.0% humus (CEC=200), 30% kaolinite (CEC=5), 5%smectite (montmorillonite) (CEC=80), 10% illite (CEC=20), 5% mica (CEC=70) and 49% sesquioxides (CEC=2). Calculate the CEC of the soil? Which colloids contributed the most and which contributed the least? (All CEC are in molc/kg soil).

6. Calculate the amount of pure CaCO3that could theoretically neutralize the H+ in one-year acid rain if a 1-hectare (ha) site received 200 mm of rain per year and the average pH of the rain was 5.0.

7. Calculate the pH and pOH of a soil with the following H+ concentrations: (a) 0.0000001M (b) 0.00001M (c) 0.005M? Which soil is relatively most acidic? Most basic?

8. Determine the calcium carbonate equivalent (CCE) of the following compounds: (amount that has the same neutralizing value as 100 g pure CaCO3) (a) KOH (b) Mg(OH)2 (c) and CaMg(CO3)2.

9. How many grams of limestone with a CaCO3 equivalent of 100% would you need to apply to an acidic soil with 85% exchangeable Al saturation to reduce it to 10%? The CEC of the soil is 12.5cmolc/kg.

10. How many grams of gypsum (CaSO4.2H2O) would you need to reclaim a sodic soil with an exchangeable sodium percentage (ESP) of 80% to reduce to it to 50%? The CEC of the soil is 12.5cmolc/kg.

Summarize main factors that have influence on SN2 type reactions: reactivity of the nucleophile, nature of the leaving group, structure of the alkyl portion of the substrate and the nature of the solvent :) can you go into each of these in a short paragraph <3

Sulfur dioxide (SO₂ ) is a gas that is a polluant responsible for acid rain. It can be formed by the following reaction:

               H₂S _(g) + O_{2 (g)} ? SO_2(g) + H₂O_(g)   (unbalanced)

What volume of 4M H₂S , in L, is required to react with excess O₂ to produce enough SO₂ to fill a cylinder that is 58ft long and has a diameter of 14ft at a pressure of 551 torr and 24?C?