1) A buffer is prepared by mixing 669 mL of 0.50 M formic acid, HCHO2, and 331 mL of 0.50 M sodium formate, NaCHO2. Calculate the pH.
What would be the pH of 85 mL of the buffer to which 8.5 mL of 0.16 M hydrochloric acid has been added?
2) A 0.300 g sample of propionic acid was dissolved in water to give 50.0 mL of solution. This solution was titrated with 0.350 M NaOH. What was the pH of the solution when the equivalence point was reached?
i do not understand these questions at all. please help if you can. thanks in advance!
2007-06-02 15:43:52 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
If you do not understand the questions at all, it is likely that you have missed class a lot lately. You probably can't get what you need here. (I started but the answer was getting much longer than is reasonable in this format.) If you have a valid reason for having missed so much class, I'm sure your prof will be willing to help you in office hours.
2007-06-02 15:51:01 · answer #1 · answered by Dylan M 2 · 1⤊ 0⤋
You need to know what is the numerical value of Ka = [H+][CHO2-]/[HCHO2]. Propionic acid is CH3CH2CO2H. You need to know the Ka =[H+][CH3CH2CO2-]/[CH3CH2CO2H]
2007-06-02 23:00:19 · answer #2 · answered by steve_geo1 7 · 0⤊ 0⤋
hi dude my name is elvin. i'm from singapore. can we discuss Q1 and Q2 via msn?
msn:chyehin88@hotmail.com
2007-06-02 22:53:03 · answer #3 · answered by 1-man-show 3 · 0⤊ 1⤋