All Questions
7
questions
4
votes
2
answers
828
views
Why does denaturation of albumen protein cause pH of solution to increase?
I'm interested in the denaturation of proteins by alcohols, specifically by ethanol.
I have devised a simple experiment in which I inject solutions of ethanol (of variable concentrations) into ...
- 151
4
votes
2
answers
630
views
Why does the isoelectric range decrease as an Alanine chain grows longer?
The pK1 and 2 values for alanine are 2.3 and 9.7. In the dipeptide Ala-Ala, they are 3.1 and 8.3 and in tri-peptide Ala-Ala-Ala, they are 3.3 and 8.0. Why does this trend in pKa values exist? Why does ...
- 98
4
votes
1
answer
1k
views
Using baking soda paste (alkaline) to "neutralize" honeybee venom (acidic). Is this scientifically sound?
I recall reading (courtesy: my 9th grade Chemistry text-book, chapter Acids, Bases and Salts), something along the lines of:
Bee venom is acidic. This is why the area of skin (stung by a bee) is ...
- 18.8k
5
votes
1
answer
2k
views
Using electronegativity and atomic size to compare acidity of cysteine with serine
In proteins, the alcohol group of serine is generally more difficult to deprotonate than the thiol group of cysteine.
Serine and cysteine respectively:
In the literature, the explanation given is ...
- 320
-5
votes
2
answers
2k
views
Where on the backbone does a peptide get protonated at low pH?
As a particular example, how does the backbone of a peptide look at $\mathrm{pH}~2$? Where does the backbone get protonated in such an acidic solution?
I know that at low $\mathrm{pH}$ the free ...
- 197
2
votes
3
answers
4k
views
Buffer Capacity Calculation
I know buffer capacity is the following:
$$β=\frac{Δ(\ce{H+})}{Δ(\mathrm{pH})}$$ specifically the amount of acid/base that needs to be added to change pH by 1 unit.
If I have data about how pH of a ...
- 123
4
votes
2
answers
3k
views
What happens when you mix milk and coke?
Add small amounts of milk to a bottle of coke, and you end up with a white-ish precipitate with a clear liquid on top. "The Internet" seems to agree that phosphoric acid in coke reacts with something ...
- 4,723