Posted by **alan** on Saturday, February 2, 2008 at 1:38pm.

Here are 2 questions I worked out, but need them checked. Also, can't get answer to another question correct unless question 1 is correct. Would you check the first 2 and help me with the third?

1) What is the pH of a 0.05 M solution of TRIS acid (pka = 8.3)?

My answer: I used the formula pH= (pka- log (HA)} /2 then I plugged in:

pH= 8.3-log(0.050)/2

pH= 4.8

2) What is the pH of a 0.045 M solution of TRIS base?

My answer: I used the formula PH=pka+14+log (base)/2

Then i plugged in:

pH=8.3+14+log(0.045M)/2 =

pH=10

3) How many total mL of 1 M NaOH can you add to the solution in problem 1 and still have a good buffer (that is, within 1 pH unit of the pka)?

Thank you.

## Answer This Question

## Related Questions

- chemistry lab - Here are 2 questions I worked out, but need them checked. Also, ...
- Stat HW for. - 1. A student taking a midterm exam in Ancient History comes to ...
- math - Can anyone help with combining like terms? The question - 11 + 5t^2 + t...
- General - Please understand that I am not upset with anyone or whatever I just ...
- Statistical concept 68-95-99.7 - 1. A student taking a midterm exam in Ancient ...
- Computer (C) - I need help with c programming, i need to fill in the code and I ...
- *****Help Statistic - Imagine taking a 10-question true or false exam. You ...
- algebra - here is the question: I am confused about the steps I need to follow ...
- MATH-Stuck :-( - I really need help factoring these special Trinomials. This ...
- MATH-STUCK :-( - I really need help factoring these special Trinomials. This ...

More Related Questions