Please calculate the amount of a compound (A) that remains in 10 mL of an aqueous phase after three extractions with toluene (10 mL each) if the partition ratio (K_D) is

a) K_D = 9,   b) K_D = 3.   Show your calculations.

why are water and sodium bicarbonate extractions performed on the reaction product? (Lab: synthesizing ester from carboxylic acid and alcohol)

a 0.5153g solid sample containing only a mixture of LaCl3 & Ce(NO3)3 was dissolved in water. Potassium iodate was then added to the obtained solution producing the precipitates La(IO3)3 molar mass 663.61 g/mol & Ce(IO3)3 molar mass 664.82 g/mol. the total mass of the precipitates was found to be equal to 1.1650g. Calc the % of LaCl3 and Ce(NO3)3 in the sample.

i have to where there are two equations and two unknowns. I just don't know how to solve for the equations

A mixture of Na2CO3 and NaHCO3 has a mass of 82.0 g . It is dissolved in 1.00 L of water and the pH is found to be 9.92. Find the mass of NaHCO3 in the mixture.

Calculate the pH of the solution that results when 15.0 mL of 0.1650 M lactic acid is A) diluted to 45.0 mL with distilled water B)mixed with 30.0 mL of 0.0825 M NaOH solution. C)mixed with 30.0 mL of 0.140 M NaOH solution. D)mixed with 30.0 mL of 0.140 M sodium lactate solution.

The equilibrium concentration of hydroxide ion in a saturated cobalt(II) hydroxide solution is ...................M.

What test would you proform to identifying this clear liquid unknow? 2. Explain why you selected the test ? 3.if a substance is not water soluble, the electrical conductivity test cannot be used determine wether the substance contains ionic bonds or covalent bonds why?

1)   Consider the titration of 50.0 mL of 0.200 M HClO₄ by 0.100 M NaOH. Complete the table with answers to the following questions:

What is the pH after 35.5 mL of NaOH has been added?

At what volume (in mL) of NaOH added does the pH of the resulting solution equal 7.00?

A 147-g sample of steam at 100 ∘C is emitted from a volcano. It condenses, cools, and falls as snow at 0 ∘C. (For water, 80. cal (334 J) is needed to melt 1 g of ice or must be removed to freeze 1 g of water and 540 cal (2260 J) is needed to convert 1 g of water to vapor at 100 ∘C.) Part A How many kilojoules of heat were released?

1. Can trimyristin be classified as a saturated fat? (Consider the structural feature present in unsaturated fats?)

A twelve pack of your favorite beverage (12 fl. oz. cans) is placed in a cooler at 70o F. How much heat must be removed (kJ) to cool the beverages to 37o F?

Suppose you have a concentrated solution (S1) with a concentration equal to 1 M. You use their solution to make more dilute solutions S2-S6. Complete the following table, which describes the solution process. NOTE: Not all of the solutions are diluted S1; some are made from solutions that are derived from S1. The equation C₁V₁ = C₂V₂ should be used as a starting point for calculation. You can assume all volumes are additive. S2 is shown as an example.

Problem 20.51

Given the following reduction half-reactions:
Fe3+(aq)+e??Fe2+(aq)
E?red=+0.77V
S2O2?6(aq)+4H+(aq)+2e??2H2SO3(aq)
E?red=+0.60V
N2O(g)+2H+(aq)+2e??N2(g)+H2O(l)
E?red=?1.77V
VO+2(aq)+2H+(aq)+e??VO2+(aq)+H2O(l)
E?red=+1.00V

Part A

Write balanced chemical equation for the oxidation of Fe2+(aq) by S2O2?6 (aq).

Express your answer as a chemical equation. Identify all of the phases in your answer.

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Part B

Calculate ?G? for this reaction at 298 K.

Express your answer using two significant figures.

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Part C

Calculate the equilibrium constant K for this reaction at 298 K.

Express your answer using one significant figure.

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Part D

Write balanced chemical equation for the oxidation of Fe2+(aq) by N2O(g).

Express your answer as a chemical equation. Identify all of the phases in your answer.

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Part E

Calculate ?G? for this reaction at 298 K.

Express your answer using three significant figures.

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Part F

Calculate the equilibrium constant K for this reaction at 298 K.

Express your answer using one significant figure.

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Part G

Write balanced chemical equation for the oxidation of Fe2+(aq) by VO+2(aq).

Express your answer as a chemical equation. Identify all of the phases in your answer.

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Part H

Calculate ?G? for this reaction at 298 K.

Express your answer using two significant figures.

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Part I

Calculate the equilibrium constant K for this reaction at 298 K.

Express your answer using one significant figure.

whta is the strongest possible acid in a solution when water (H₂O) i sthe solvent? what is the strongest possible acid in a solution when ethanol (CH₃CH₂OH or EtOH) i sthe solvent? what is the strongest possible acid in a solution when acetic acid (CH₃COOH) is the solvent ?