What are the experimental procedures for conducting a standard addition method in analytical chemistry. Why such a method is so popular in complex sample analysis? Use equations and plots and figures to explain hoy the unknown concentration is obtained from the measured data.

A student is asked to determine how many different dyes a water-soluble food coloring contains. Which technique is best suited to this task?
     (A) paper chromatography
     (B) distillation
     (C) column chromatography
     (D) filtration

1.00atm of H2 and 1.00atm of Br2 were mixed in a 1.00L flask at 25°C. Under the appropriate conditions, gaseous HBr will form. At equilibrium, 1.10×10^13 molecules of H2 were found. Given the information below, calculate the values of K, delta G°, and delta S°. (for this problem, you do not have available values of free energies of formation and values of entropies of formation.)
H2(g) + Br2(g) ----> 2HBr(g)   delta H°= -103.8kJ

Discuss the results and observations of the data obtained for each acid. Specifically, discuss how the equivalence point volumes obtained from the different graphs compare to each other and to the endpoint volume determined from the indicator color change. Also, comment on why so many different means of determining the endpoint volume are necessary. Under what circumstances would one be better than another? Compare your Ka to that reported in the textbook and discuss any discrepancies

the experiment was titration of HCL and NaOH and then determining the equivalence point and the endpoint using a different method

Analysis of the Acid using Different Methods

A fuel gas containing 77% methane, 7% ethane and rest propane by volume. The fuel flows to a combustion chamber at the rate of 1321 m^3/h at 15C and 150 kPA (gauge) where it is burned with 8% excess air entering at 20C. ROund your answer to the nearest whole number.

a) WHat is the propane percent in the fuel gas?

b) What is the actual number of moles of fuel flowing into the combustion chamber?

c) What is the actual number of moles of oxygen flow into the combustion chamber?

d) What is the actual number of moles of air flowing into the combustion chamber?

e) What is the ACMH?

1) The boiling point of an aqueous solution is 101.98 ∘C. What is the freezing point? Consult the table of colligative constants.

freezing point:   °C

2)

Quinine is a natural product extracted from the bark of the cinchona tree, which is native to South America. Quinine is used as an antimalarial agent.

When 0.829 g of quinine is dissolved in 25.0 g of cyclohexane, the freezing point of the solution is lowered by 2.13 ∘C. Look up the freezing point and Kf constant for cyclohexane in the Colligative Constants table.

Calculate the molar mass of quinine.

molar mass:

g/mol

3)

If a 0.770 m aqueous solution freezes at −2.30 ∘C, what is the van't Hoff factor, i, of the solute?

Consult the table of K_f values.

i=

Consider the following reaction:

A(g)⇌2B(g)

Find the equilibrium partial pressures of A and B for each of the following different values of Kp. Assume that the initial partial pressure of B in each case is 1.0 atm and that the initial partial pressure of A is 0.0 atm. Make any appropriate simplifying assumptions.

Kp = 2.0?

Kp = 1.4 x 10^4?

Kp = 1.2 x 10^5?

When 22.0 mL of a 2.08×10^-4M ammonium iodide solution is combined with 18.0 mL of a 5.92×10^-4M lead acetate solution does a precipitate form? _____ (yes or no)

For these conditions the Reaction Quotient, Q, is equal to _____

1.00 g mixture of Na2CO3and K2CO3was titrated with HCl. The analysis shows that there are 8.00x10-3moles of CO3-2 ions. Calculate the w/w% Na2CO3in the mixture.

please shows the steps

1.) The total pressure (P_T) os a sample of a gas collected over water at 13.0^oC is 0.588 atm. Determine the partial pressure (P_i) of the gas.

2.) Rearrange the ideal gas equation to solve for density (g/v). Hint: you will need to make a substitution for moles "n"

3.) Use your quation from (z) and the result from (l) to calculate the molecular weight of a gas if 303 ml of the gas, collected at 28^oC, weighed 0.347g.

Give the approximate chemical shifts, the expected peak multiplicities, and the

relative integration for methyl 2-bromopropionate (CH₃CHBrCO₂CH₃).

       chemical shift                    multiplicity                 relative integration

a.A peanut consists of 49.2% oil and 20.8% carbohydrate. (The remaining mass of the peanut is not combustible.) An average peanut has a mass of 0.75 grams. Determine the mass of oil and carbohydrate in one peanut. Then determine the amount of energy released (in kJ) when one peanut is burned

a.How many peanuts will it take to boil 1.00 liters of water?

Given the following information about Fe in aqueous solutions, what will be the ratio of (Fe(OH)₂⁺) to (Fe(OH)₃⁰) in solution at pH 6.0, 6.5, 7.0, 7.5, 8.0, 8.5?

Fe³⁺ + 2H₂O = Fe(OH)₂⁺ +2H⁺ logK = -5.7

Fe³⁺ + 3H₂O = Fe(OH)₃⁰ + 3H⁺ logK = -13.1

calculate the pressure in both atm and mmHg exerted if 20.0 mL of 0.10 M HCl reacts with excess magnesium in a 125 mL flask at 298 K. What mass of magnesium reacts? What would be the pressure if 1.0 M HCl is used? Assume the magnesium occupies no volume.