Chemical Equilibrium

Calculating Ksp for PbI2 using Delta G, S, and H

How do you go about calculating the Ksp for PbI2 using the data given?

Calculating Molar concentration of calcium ion. Needed by 9pm. Please help!

The Ksp value for calcium fluoride CaF2 is 4.0 x 10^-11 

Calculate the Molar concentration of calcium ion Ca(2+) in a saturated aqueous solution of CaF2

Distillation to determine difference in boiling points

Mixtures of propan-2-ol and propanone can be spearated by distllation due to their different boiling points. Explain why these compounds have such different boiling points even though they have very similar molar masses.





Boiling point(°C)



Molar mass(g/mol)




calculating mole fractions in Raoult's law problems

when we deal with the raoult's law equation for an ideal solution of 2 ideal liquids which are volatile, do we have to use the number of moles at equilibrium to calculate the mole fraction of solvent in the solution? or can we use the initial number of moles ?

effect of concentration on preciptate

Does production of  a precipitate decrease concentration?

Production of ammonia by Haber process

I only need help with the last three dot points.

Acid Base Equilibirum - Finding concentrations BEFORE equilibrium

What are the equilibrium concentrations of [H3O+], [CN-] and [HCN] if the concentration of HCN before equilibrium is 1.0 M?  Also, what is the pH of the solution? (Ka = 6.3x10-10)  Write out the entire ICE table for full credit.
I have no idea how to approach the problem when you need to find the values BEFORE equilibrium! I'm only familiar with how to find the values at equilibrium. Please help!!!

A gas has a volume of 2.0 L....

A gas has a volume of 2.0 L, and a pressure of 2.0 atm. If the pressure is increased to 4.0 atm, what is the new volume of the gas? 

I really just don't know how to even set this problem up. Thats my problem. Dont know where to start. Help me please...

calculation of pH......

1 millimole of Aluminium Hydroxide is taken for an experiment. At a certain temperature solubility product of aluminium hydroxide is 5 X 10^(-33) M^4 and formation constant of tetrahydroxy aluminate is(III) =1X10^34.

1.       Calculate the minimum PH at which all the aluminium hydroxide goes into 1 liter solution as tetrahydroxy aluminate(III)

2.       Calculate the maximum hydroxide ion in the solution formed when all the aluminium hydroxide goes into one litre aqueous solution as Aluminium (3+) ions

Confused on Acids and Bases in equilibrium??

How do i know when to use Ka or Kb when trying to find pH? Also how do i tell the difference between and acid and a base when the equation is written.somthing like NH3+H2O-->OH-+NH+4 ?


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