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Chemistry

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1.) Determine the pH of an HF solution of each of the following concentrations. In which cases can you not make the simplifying assumption that x is small? (Ka for HF is 6.8 x 10^-4.)

 

a.) 0.250M b.)0.0500M c.)0.0250M

This question deals with a solution originally containing generic substances: HA (Ka = 8.18x10-9) and NaA

 

A solution originally contains 75.0-mL of 1.51 ^mol/_L HA and 1.11 ^mol/_L NaA. 

 

Calculate the pH after 0.410 mmol of KOH are added to the original solution. 

This question deals with a solution containing generic substances: R3N (Kb = 8.78 x 10-5) and R3NHCl

 

An aqueous solution containing 0.442 M R₃N and an unknown amount of R₃NHCl has a pOH of 4.65.

 

Calculate the concentration (in M) of R₃NHCl in the aqueous solution.

separation of mixture of m-nitroanile, benzoic acid and naphthalene by extraction reaction mechanism

Balance the following skeletal half-reaction in acidic conditions.

 

VO²⁺(aq)→V³⁺(aq)

 

Select the correct coefficient and the correct side of the reaction equation for each of the following entities.

 

Entity Coefficient (1-10) Side of reaction equations(REACTANT/PRODUCT)

H+ (aq)

H20(I)

e-

 

 

The half-reaction in question 1 is classified as 

Select one:

oxidation

reduction