Class blog 4/8/2014

Today we got a sheet about the 2014 GBS science contest. If you are interested in this I would talk to Mrs. Friedmann.  

QUIZ ON THURSDAY!

The quiz will be covering:

• Le Chatelier's Principle
• Ksp
• Ksp - common ion problems

We went over the solubility product constant packet as well.

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We then learned how to do common ion problems:

Solubility in water vs. solubility in another solution. 

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ex: BaSO4 <==> Ba (aq) + SO4 (aq)

                            0 M         0.10 M

                            +x            +x 

                            (x)            (0.10 + x)

Ksp BaSO4 = 1.1 * 10^-10

What is its solubnility in 0.10 M Na2SO4 solution?

Na2SO4 ==> 2Na   + SO4

0.10 M           0.20M   0.10M

1.1*10^-10 = (x)*(0.10+x)

1.1*10^-10 = 0.10x + x^2

1.1*10^-10 = x(0.10x)                                (small x rule)

x = 1.1 * 10^-9

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