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April 18, 2014

Homework Help: chemistry

Posted by jaycab on Thursday, January 20, 2011 at 3:37am.

A. Strong Base

1.) What is the concentration of a solution of KOH for which the pH is 11.89?

2.) What is the pH of a 0.011M solution of Ca(OH)2?

B. Weak Acid

1.) The pH of a 0.060M weak monoprotic acid HA is 3.44. Calculate the Ka of the acid.
2.) The pH of 0.100M solution of weak monoprotic acid HA is 2.85. What is the Ka of the acid?

C. SALT HYDROLYSIS
1.) Calculate the pH of a 0.24M sodium formate (HCOONa) solution. Kb=5.9x10^-11.
2.) Calculate the pH of 0.25M pyridium chloride (C5H5NHCl)solution. Ka=5.9x10^6.

D. COMMON ION EFFECT
1.) What is the pH of a solution that is 0.30M in HCOOH and 0.52M in HCOOK.
Ka of HCOOH=1.7x10^-4.
2.) Calculate the pH of a buffer system containing 1.0M CH3COOH and 1.0M CH3COONa. Ka of CH3COOH=1.8x10^-5.



Please help.... i do not know what to do....

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