HomeworkLib
Question

6. A buffer composed of TRIS (FW-121.135 g/mol) and TRIS-HCI (FW-157.596 g/mol, pKa 8.072) contains the following forms in so

please explain. thanks

science   chemistry   
0 0
Add a comment Improve this question Transcribed image text
Next > < Previous
Sort answers by oldest

Homework Answers

Answer #1

Mass of TrisHC We know, Moles 9.500 g 13.100 g (Mass in g) / (Molar Mass in g/mol) So Moles Tris.H+= 9.500 157.60 mol Mass of

OH- addition to buffer When OH- is added to the buffer, it reacts with acid TrisH+ and produce Tris. So during the addition o

0 0
Add a comment
Know the answer?
Add Answer to:
please explain. thanks 6. A buffer composed of TRIS (FW-121.135 g/mol) and TRIS-HCI (FW-157.596 g/mol, pKa...
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for? Ask your own homework help question. Our experts will answer your question WITHIN MINUTES for Free.
Similar Homework Help Questions

  • Calculate the pH of a buffer solution prepared by mixing 75 mL of 1.0 M lactic...

    Calculate the pH of a buffer solution prepared by mixing 75 mL of 1.0 M lactic acid and 25 mL of a 1.0M sodium lactate. (pka of lactic acid = 3.86) Calculate the change in pH that occurs when 0.01moles of OH are added to a 1L buffered solution that contains 0.5M acetic acid (HC_2H_3O_2) and 0.5M acetate ion (C_2H_3O_2). Acetic acid pka = 4.76.

  • Tris, (HOCH2)3CNH2 (pKb = 5.91), a very common buffer for studying biochemical processes, is prepared by...

    Tris, (HOCH2)3CNH2 (pKb = 5.91), a very common buffer for studying biochemical processes, is prepared by a biological chemist using 10.0M NaOH to a pH of 7.79 using 31.52 g of (HOCH2)3CNH3Cl, or TrisH+, (MW=157.597g/mol, pKa 8.075). (a) Calculate the ratio of [Tris]/[TrisH+] at a pH of 7.79. (b) Calculate the initial moles of (HOCH2)3CNH3Cl (MW=157.597g/mol) that were added. (c) Write the chemical reaction between the TrisH+ and the added NaOH. (d) Calculate the moles of hydroxide used to produce...

  • 1) Calculate the pH of the 1L buffer composed of 500 mL of 0.60 M acetic...

    1) Calculate the pH of the 1L buffer composed of 500 mL of 0.60 M acetic acid plus 500 mL of 0.60 M sodium acetate, after 0.010 mol of HCl is added (Ka HC2H3O2 = 1.75 x 10-5). Report your answer to the hundredths place. 2) Calculate the pH of the 1L buffer composed of 500 mL 0.60 M acetic acid plus 500 mL of 0.60 M sodium acetate, after 0.010 mol of NaOH is added (Ka HC2H3O2 = 1.75...

  • 9.The pka of NH is 9.25. What is the highest pH that a buffer system composed...

    9.The pka of NH is 9.25. What is the highest pH that a buffer system composed of NH4 and NH3 will buffer at effectively? a) 13.25 b) 12.25 c) 11.25 d) 10.25 Which of the following mixtures is a buffer: a) 25mL 0.1M HF b) 25mL 0.1M HCI mixed with 25mL 0.1M NaOH. c) 25mL 0.1M NH3 mixed with 12.5mL 0.1M HCI. d) 25mL 0.1M NaF 11. The pH of LiOH was measured to be 11.53. Which of the following...

  • How many mL of 0.500 M HCI would have to be added to the buffer prepared...

    How many mL of 0.500 M HCI would have to be added to the buffer prepared by dissolving 12.0 g of tris (FM 121.14) plus 7.0 g of tris hydrochloride (FM 157.60) in 250 ml water to adjust the pH of the solution to 8.21? Enter your answer in mL NH3 NH HOCH2 + H+ CH OH HOCH,C HOCH, BH+ PK, = 8.07 HOCH2CH OH HOCH, B = "tris" Tris(hydroxymethyl)aminomethane B+H +BH

  • A 1.00 L buffer solution with pH = 4.74 is composed of 0.30 mol acetic acid...

    A 1.00 L buffer solution with pH = 4.74 is composed of 0.30 mol acetic acid and 0.30 mol sodium acetate. A) Determine the pKa of acetic acid B) If 0.030 mol of NaOH is added, determine the pH of the solution

  • benzoic acid has PKa of 4.2 and MW 122g/mol. sodium benzoate has MW 144g/mol . a)...

    benzoic acid has PKa of 4.2 and MW 122g/mol. sodium benzoate has MW 144g/mol . a) mixing 50 grams of benzoic acid with 50 grams of sodium benzoate will lead to the same PH as mixing 200 grams of each. How do they differ in buffer capacity?B) could benzoic acid/ benzoate act as a buffer at PH 6.0? why or why not?C) what concentration of benzoic acid and sodium benzoate should be used to prepare a buffer that has a...

  • A buffer contains 0.020 mol of lactic acid (pKa = 3.86) and 0.100 mol sodium lactate...

    A buffer contains 0.020 mol of lactic acid (pKa = 3.86) and 0.100 mol sodium lactate per liter of aqueous solution. a. Calculate the pH of this buffer. b. Calculate the pH after 8.0 mL of 1.00 M NaOH is added to 1 liter of the buffer (assume the total volume will be 1008 mL).

  • 21.) Tris, (HOCH2)3CNH2 (pKb = 5.91), a very common buffer for studying biochemical processes, is prepared...

    21.) Tris, (HOCH2)3CNH2 (pKb = 5.91), a very common buffer for studying biochemical processes, is prepared by a biological chemist using 10.0M NaOH to a pH of 7.79 using 31.52 g of (HOCH2)3CNH3Cl, or TrisH+, (MW=157.597g/mol, pKa 8.075). >>>> Need help with second part of question pls>>>>...Now you dilute the solution from problem 21 to 1.0 L and take half of the buffer (500.0 mL) and add 0.0100 moles solid HCl. What is the new pH?

  • a solution is prepared by mixing 2.50 g of acetic acid (CH3CO2H, FW=60g/mol, Ka=1.75x10^(-5) with 4.70...

    a solution is prepared by mixing 2.50 g of acetic acid (CH3CO2H, FW=60g/mol, Ka=1.75x10^(-5) with 4.70 g of sodium acetate (CH3CO2Na, FW=82g/mol) and adding water to a 500 mL volume. Note that sodium acetate yields Na+ and CH3COO-, the conjugate base of acetic acid. a.) what is the pH? b.) 15mL of 0.50 M HCl were added to the 500 mL solution, what is the pH after addituon of acid? write answer to 3 sig. figured.

ADVERTISEMENT
Free Homework Help App
Download From Google Play
Scan Your Homework
to Get Instant Free Answers
Need Online Homework Help?
Ask a Question
Get Answers For Free
Most questions answered within 3 hours.
ADVERTISEMENT
ADVERTISEMENT