acid base equilibria

Please show all work and remember this is a first year course. Chem is my weakest subject. Please send responsse in Word. Also, if you are not willing to show me the proper way to do these by showing the calculations and will only supply me with some notes that I could read out of any textbook myself, please do not take this posting and take my money as others have.  Sorry to sound cold, but some on here have taken my money and not asnwered question and a couple have given COMPLETELY wrong answers.

thank you

1.  The Common Ion Effect.  What is the pH of a solution that contains 0.250-M benzoic acid and 0.600-M sodium benzoate?  

2.  Buffers.  A buffer solution is made of 0.100 M HOCl and 0.250 M NaOCl.  What is the pH of the resulting solution when a 15.0-mL portion of 0.200 M HCl is added to 100.0 mL of the buffer?

3.  Preparing a Buffer.  The pH of blood is 7.40.  Calculate the [HCO3-] / [H2CO3] ratio of a bicarbonate-carbonic acid buffer system that will effectively maintain a sample of blood at a pH of 7.40.  Hint: the Henderson-Hasselbalch equation is useful for this type of problem.  

4.  Weak Acid - Strong Base Titration.  A 50.0-mL portion of 0.200 M HCOOH is titrated with 35.0 mL of 0.200 M KOH.  What is the pH of the resulting solution?  

5.  Weak Acid - Strong Base Titration.  Now consider a titration that is similar to problem 4, except that a 50.0-mL portion of 0.200 M HCOOH has been titrated with 0.200 M KOH to the equivalence point.  What is the pH at the equivalence point?