HomeworkLib
Question

HI,

would you please explaine how to get the answer for this question?

Thank you !

27) Histidine has pKas of 1.82, 9.17, and 6.00 for its carboxyl, amino, and R-groups, respectively. What is the charge of Histidine at pH 7.5? A) -3 B) -1 C)o D) +1 E) +2

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

Homework Answers

Answer #1

For carboxyl group pka is 1.82, since pH is 7.5, so carboxyl group will act as in acidic medium that is COOH

For amino group pka is 9.17, since pH is 7.5, so amino group will act as in basic medium that is NH2

For R groups pka is 6.00, since pH is 7.5, so R group will act as in acidic medium, but it will not have any charge.

So, net charge is zero

0 0
Add a comment
Know the answer?
Add Answer to:
HI, would you please explaine how to get the answer for this question? Thank you !...
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

  • Please justify each answer ! I would appreciate it eio, te -amino group 1s on the...

    Please justify each answer ! I would appreciate it eio, te -amino group 1s on the left, and thus the absolute configuration of the citrulline is I Relationship between the Titration Curve and the Acid-Base Properties of Glycine A 100 mL solution of 0.1 M glycine at pH 1.72 was titrated with 2 M NaOH solution. The pH was monitored and the results were plotted as shown in the following graph. The key points in the titration are designated I...

  • Hi! I would really appreciate to get help with this question! Thank you very much for...

    Hi! I would really appreciate to get help with this question! Thank you very much for your help! -------------- Accompany the exercise by a useful sketch! Use Excel, of course, (if needed.) A newsletter for investors recently reported that the average stock price for a blue chip stock over the past year was $72. No standard deviation was given. Would the stdev be more likely to be $6 or $16 or $60? Explain; ------- Thank you very much!

  • Hi, please help me to solve this question and tell me how you get this answer....

    Hi, please help me to solve this question and tell me how you get this answer. Thank you. Dragonstone Corp. has a price earnings ratio of 12 and a dividend yield of 3.2%. Lionworks, Inc. has a price earnings ratio of 15 and a dividend yield of 0.38%. Based on this information, it appears that investors think: O A. Lionworks has a bright future, but Dragonstone does not. O B. Dragonstone has a bright future, but Lionworks does not. O...

  • Hi, Please explain the steps needed to get the answer. Thank you Constants Two small spheres...

    Hi, Please explain the steps needed to get the answer. Thank you Constants Two small spheres with mass m 14.9 g are hung by silk threads of length L 1.12 m from a common point (Figure 1). When the spheres are given equal charges so that q 2q. each thread hangs at an angle 0 28.0 from the vertical. wers All attempts used; correct answer displayed Part C Figure 1 of 1 Find the magnitude of g. L. Submit mass...

  • Hi can you check/help me with these? And please explain if you can! Thank you! These...

    Hi can you check/help me with these? And please explain if you can! Thank you! These questions are about Ion-exchange Chromatography 1. The charge on the column is negative a. Would the protein KLGVRQYWRRRRPLYWTV bind to it? 2. Does the buffer action work by a difference in ionic strength? 3.   4. T/F: You will likely get more fractions of DNP-glycine than the other two proteins. True because DNP-glycine goes through very fast because it is small. 5. T/F: Cytochrome c...

  • (please only answer this if you know how to get the correct answer, thank you). question:...

    (please only answer this if you know how to get the correct answer, thank you). question: Ice cream is a close substitute for frozen yogurt. Use the model of supply and demand to explain how a fall in the price of frozen yogurt would affect the price of ice cream and the quantity of ice cream sold. Please identify the exogenous and endogenous variables and provide a graph of supply and demand.

  • Hi, can I please get some help with this question? Thank you Prove: If lim f(x)...

    Hi, can I please get some help with this question? Thank you Prove: If lim f(x) = L and lim g(x) = M, then lim(f(x) · g(x)) = L.M. xa xa xa 5. State the converse of #4 above. Next, find a counterexample to the converse of #4 above.

  • Hi, can I please get some help with this question? Thank you Prove: If lim f(x)...

    Hi, can I please get some help with this question? Thank you Prove: If lim f(x) = L andlim g(x) = M, then lim(f(x) + g(x)) = L+M. x-a xna xa 3. State the converse of #2 above. Next, find a counterexample to the converse of #2 above.

  • Please explain how to get this answer. Thank you Determine whether the series is convergent or...

    Please explain how to get this answer. Thank you Determine whether the series is convergent or divergent. 4n – 1 n = 1 O convergent divergent If it is convergent, find its sum. (If the quantity diverges, enter DIVERGES.) DIVERGES

  • Hi, I have a problem set due for Chemistry, so I'm trying to see if I...

    Hi, I have a problem set due for Chemistry, so I'm trying to see if I have the right answers, I'm going to post a few questions on a post since I can only post so many times & the problem set has 40 questions!! Thank you in advance! 1. Please list the names of 2 hydrophilic neutral amino acids: - Asparagine, Glutamine. 2. Please list the names of 2 hydrophilic basic amino acids. In 30 words or less, why...

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