chemistry

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.

  1. 👍 0
  2. 👎 0
  3. 👁 108
asked by alan

Respond to this Question

First Name

Your Response

Similar Questions

  1. General

    Please understand that I am not upset with anyone or whatever I just want to know something. I have some work to be checked and the regular tutors here say that "we will be happy to critque your thinking" right? Ok so when someone

    asked by Jon on April 1, 2008
  2. English

    1. What was their job? 2. They worked at a bakery. 3. He worked at a bakery, and she worked for a bank. 4. What were their jobs? 5. He worked at a bakery, and she worked for a bank. 6. They worked at a bakery. (Will you look at

    asked by rfvv on April 15, 2010
  3. Precalculus

    Solve each of the absolute value equations algebraically. |(x/2)+3|=3x-3 Now the work isn't an issue, I did all that & I have my answer. My problem is, I double checked my answer on mathways & it said only my first answer:

    asked by Kayla on May 25, 2019
  4. chemistry lab

    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

    asked by ryan on February 2, 2008
  5. Physics

    Thanx DRWLS! Worked like a charm and I checked behind myself with the same formula!!!

    asked by Inascent on November 16, 2009
  6. Physics

    In the hydraulic system shown in the figure, the piston on the left has a diameter of 4.5cm and a mass is 3.0kg. If the density of the fluid is 710kg/m^3 , what is the height difference h between the two pistons in m? I checked

    asked by Lhaedy on December 11, 2013
  7. Pre-Algebra

    Can someone please help me answer these two questions? I have already answered one, and need it checked. Give any three ordered pairs that are solutions of the equation: 1. x-y=6 (12,6) (10,4) (15,9) 2.-3x - 2y = 0 ??? 3.2x- 3y =

    asked by mysterychicken on May 6, 2009
  8. 7th Grade Math

    I need help with solving the answer to the problem below. What is the percent decrease, to the nearest percent, of the number of books checked out from June to July? June - 623(# of books checked out) July - 715(# of books checked

    asked by Tina on April 13, 2016
  9. math

    It certainly pays to check your work! I just took a HUGE science test. I checked it over twice before I turned it in, and got an A! My score was 94 out of 100! I figure that each time I checked it, I found half of the mistakes

    asked by lexis green on May 21, 2012
  10. weird maths sum!!

    The questions is simply: Find the range of values of x for which x(2-x)

    asked by Bailey on June 16, 2009

More Similar Questions