Calculate the standard potential, E°, for this reaction from its equilibrium constant at 298 K. X(s) + Y^2+(aq) ⇌ X^2+(aq) + Y(s)     K= 1.43 x 10^-6     E^o = ? V

calculate [OH−] and pH for each of the following solutions.

1. 6.0×10⁻² M NaBrO

2. 7.7×10⁻² M NaHS

Consider the titration of a 25.0 −mL sample of 0.100 M HC2H3O2 with 0.120 M NaOH. Determine each of the following.

the initial pH

Express your answer using two decimal places.

B)

Part B

the volume of added base required to reach the equivalence point in mL?

Part C

the pH at 4.00 mL of added base

Express your answer using two decimal places.

Part D

the pH at one-half of the equivalence point

Express your answer using two decimal places.

Part E

the pH at the equivalence point

Express your answer using two decimal places.

Consider the equilibrium reaction

CO(g)+H2O(g)⇋CO2(g)+H2(g)

Determine how each change in the left-hand column will stress the system and in which direction the equilibrium reaction will shift in response.

Drag the appropriate labels to their respective targets

Choices for system stress:

Forward reaction rate temporarily decreases, Reverse reaction rate temporarily decrease, Reverse reaction rate temporarily increases, Forward reaction rate temporarily increases

Choices for equilibrium shift:

increase reactant , increase product, decrease product, decrease reactant

3.The partition coefficient of Compound A is 7.5 in dichloromethane (a.k.a. methylene chloride) with respect to water.

If 5 grams of Compound A were dissolved in 100 mL of water, how much of Compound A would be extracted with four 25-mL portions of dichloromethane?

Extraction 1:

Extraction 2:

Extraction 3:                           

Extraction 4:

b.After four extractions, what percentage of the Compound A has been extracted (use percent recovery)?            

c.You are tired and want to finish your experiment as quickly as possible. How much dichloromethane would be required in one extraction to remove the same percentage of Compound A that you recovered after four 25-mL portions of dichloromethane?

A 110.0 −mL sample of a solution that is 2.9×10−3 M in AgNO3 is mixed with a 230.0 −mL sample of a solution that is 0.11 M in NaCN. After the solution reaches equilibrium, what concentration of Ag+(aq) remains?

1) A buffer solution contains 0.356 M ammonium chloride and 0.396 M ammonia.
If 0.0550 moles of hydroiodic acid are added to 250 ml of this buffer, what is the pH of the resulting solution? (Assume that the volume does not change upon adding hydroiodic acid)

pH=____

2) A buffer solution contains 0.354 M NaH₂PO₄ and 0.393 M K₂HPO₄.
If 0.0412 moles of sodium hydroxide are added to 225 mL of this buffer, what is the pH of the resulting solution ? (Assume that the volume does not change upon adding sodium hydroxide)

pH = ___

3) A buffer solution contains 0.341 M nitrous acid and 0.235 M sodium nitrite.
If 0.0278 moles of sodium hydroxide are added to 250 ml of this buffer, what is the pH of the resulting solution ? (Assume that the volume does not change upon adding sodium hydroxide)

pH = ____

which chemicals that are green (not likely to harm the envionment) and two that are not green?

N-ethylsaccharin, O-ethylsaccharin, ethyl iodide, saccharin, N-sodium saccharin, O-sodium saccharin, NaOH, DMF

Draw a structural formula for trans-2-chlorocyclopentanol.

Draw a structural formula for 3-methyl-1-pentanol.

Draw a structural formula for trans-2-bromocyclobutanol.

Two students beging by mixing 5.0ml of a 3.1M solution of methyl orange and 5.0 ml of a 3.1 M solution of methyl red in an Erlenmyrer flask. How many drops of this mixture must be added to the top of the column so that 6.0 mmol of each dye is separated. 21drops = 1ml

Consider the following reaction:

CO(g)+2H2(g)⇌CH3OH(g)CO(g)+2H2(g)⇌CH3OH(g)

The reaction between COCO and H2H2 is carried out at a specific temperature with initial concentrations of COCO = 0.26  M M and H2H2 = 0.49  M M. At equilibrium, the concentration of CH3OHCH3OH is 0.16  M M.

Part A

Find the equilibrium constant at this temperature.

Express your answer using two significant figures.

Balance the following redox equations either in acid or base:

a. HClO -> Cl^(-) + ClO3^(-) [acid]

b. ClO4^(-) + Br2 -> Cl^(-) + BrO2^(-) [base]

c. H2S + BrO3^(-) -> SO3^(2-) + Br2 [base]

d. NH3 + SO4^(2-) -> N2 + SO^(2) [acid]

e. IO3^(-) + H2S -> I2 + SO4^(2-) [acid]