All Questions
518
questions
0
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65
views
How to find pH for acetate buffer?
Calculate the pH of the solution that results when $\pu{40.0 mL}$ of $\pu{0.100 M}$ $\ce{CH3COOH}$ is mixed with $\pu{30.0 mL}$ of $\pu{0.200 M}$ $\ce{NaCH3COO}.$ $K_\mathrm{a}(\ce{CH3COOH}) = \pu{1....
- 27
5
votes
0
answers
98
views
What is the pKa of the O-17 hydronium ion?
At low concentrations of a conjugate acid/base pair in aqueous solutions, the Henderson-Hasselbalch equation gives a good approximation of the ratio of acid and base:
$$ \frac{[\ce{A-}]}{[\ce{AH}]} = ...
- 41.2k
1
vote
3
answers
239
views
Discrepancies in using pOH vs pH to solve H+/OH- concentration change problem
I found an extremely confusing problem in one of the problems we did in class for general chemistry. This was the question:
How many moles of $\ce{H3O+}$ or $\ce{OH-}$ must you add per liter of $\ce{...
- 21
0
votes
0
answers
339
views
How much calcium hydroxide is needed to raise the pH of an aqueous sulphuric acid solution?
Lets say dissociation constants $K_{\mathrm{a}1}$ & $K_{\mathrm{a}2}$ of $\ce{H_2SO_4}$ in water are $1000$ and $0.012$ respectively. So the first dissociation step happens completely:
$$\ce{ ...
- 17
1
vote
0
answers
105
views
How does pH affect an extraction problem
I am not sure how to understand when pH will affect a given problem regarding extraction. For example, in a problem given that K$_D$ of the reaction is $1.86$ I am asked to calculate:
(a) How much ...
- 1,095
3
votes
1
answer
595
views
Calculate pH of imidazole in solution
I am having trouble understanding how to know how a molecule will reaction in solution. For example, if I have $\pu{1 M}$ of imidazole in solution, how can I calculate the pH of the solution by only ...
- 1,095
1
vote
4
answers
2k
views
Why is there an increase in the pH at the start of a titration between a weak acid and a strong base?
Why is there an increase in the pH at the start of a titration between a weak acid and a strong base even though there is acid already present to neutralize it? My intuition says that there should not ...
- 77
-1
votes
1
answer
106
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Will concentration of sodium hydroxide affect the result of chicken feather hydrolyzate if i don't standardized it?
The title of the paper:
Isolation and characterization of keratin from chicken feathers https://doi.org/10.1063/5.0002792
Here is the method:
Keratin was isolated by dissolving 5g of chicken feather ...
- 79
0
votes
2
answers
194
views
What might cause overestimated measured pH value of sodium hydroxide solution pumped with carbon dioxide?
I tried an experiment at home where I had a $\ce{CO2}$ tank pumping $\ce{CO2}$ into a solution of $\pu{28 g}$ sodium hydroxide in $\pu{200 ml}$ water. The initial $\mathrm{pH}$ was $11.24.$
I expected ...
- 59
11
votes
1
answer
2k
views
Why measure both alkalinity and pH in pools if pH alone tells us how acidic or basic something is?
I am trying to better understand the chemistry of maintaining my pool so that I can use the least amount of chemicals to control algae growth and I'm confused by the need to measure both total ...
- 221
1
vote
1
answer
405
views
Understanding weak acid-strong base titration
Today I stumbled across a website which defined the titration of weak acid and strong base as the following:
"The titration of a weak acid with a strong base involves the direct transfer of ...
user115162
2
votes
2
answers
253
views
Efficacy of Intramolecular Friedel-Crafts reaction on =o, c=o bonds of ring structures? [closed]
Updated Q:
Inquiring to understand the efficacy of intramolecular Friedel-Craft like reaction on stability on the ring structures with =o, c=o bonds.
Keen to know if ring structures are challenged
...
- 1,944
0
votes
1
answer
73
views
Approximation for pH calculation with diluted acids in weak-strong titration curve
I was wondering how one could calculate small pH changes in titrations with dilute acids.
As we know, usually we approximate the pH by saying that the conversion is quantitative. For example, when we ...
user115162
2
votes
0
answers
383
views
Why are colloidal sol particles of acidic dyes negatively charged and basic dyes positively charged, when it should be the other way round?
From NCERT Class 12 Chemistry; Sri Aurobindo Marg, New Delhi, India; January 2019; p. 136:
Colloidal solutions of basic dyes like methylene blue are positively charged whereas colloidal solutions of ...
- 317
3
votes
1
answer
2k
views
What is the pH of the universal indicator?
I know that the universal indicator is a solution of various pH indicators used to find out the pH of a substance by displaying different colors.
But, what is the pH of the universal indicator itself?
...
