All Questions
518
questions
3
votes
1
answer
805
views
When NaOH ionizes in water, does the OH– react with the water molecules or with the hydronium ions from the dissociation of water?
NaOH in water becomes $\ce{Na+}$ and $\ce{OH-}$ ions. If it's a Bronsted Lowry base then the $\ce{OH-}$ ions will take $\ce{H+}$. But FROM where exactly - from the water molecules or from the ...
3
votes
0
answers
78
views
Measuring [A-]/[HA-] with Buffer and Indicator
I'm very confused on how to calculate the [A-]/[HA] value, given the fact that my dilution series uses buffers at various pH values with the same indicator (supplied at the same concentration to each ...
3
votes
1
answer
104
views
Why is phosphine more acidic than ethylene?
Shouldn't ethylene should be more acidic? It has a C=C bond, so the density of electron cloud would be higher in the areas of the double bond while the C-H single bond have way less electron density. ...
- 110
1
vote
1
answer
81
views
Is ethylene more acidic than phosphine?
Yeah, it's straight forward. Is CH2=CH2 more acidic than PH3 or not? Why so or why not?
Any help or hint would be amazing. Thanks!
PS: I think ethylene should be more acidic. It has a carbon-carbon ...
- 110
-2
votes
1
answer
260
views
Should nitric acid be classified as a strong acid? Does it completely dissociate in water?
By definition, a strong acid must completely ionize in aqueous solution. However, in order to completely dissociate in water, strong acids must be more acidic than a hydronium ion and hence have a pKa ...
- 69
1
vote
0
answers
2k
views
Buffer solution of NaH2PO4 and Na2HPO4
We have this exercise without solutions
From a 0.2 M $\ce{NaH2PO4}$ solution and a 0.2 M $\ce{Na2HPO4}$ solution, a buffer
solution with pH = 6.8 is to be prepared. The total concentration of
$\ce{...
- 423
0
votes
1
answer
76
views
Why doesn't the volume of NH3 = 325 ml in this problem? [closed]
I'm struggling with the problem below, and don't understand why
A buffer solution with pH = 9.0 is to be prepared from a 0.2 M ammonia
solution and a 0.15 M $\ce{HCl}$ solution. The sum of the molar
...
- 423
-1
votes
1
answer
688
views
How to find the deprotonation percentage of an acid?
Given is an aqueous solution of mandelic acid (M = 152.2 g/mol; $pK_a$ = 3.4) with a molar concentration of 0.3 mol/ liter. A $\mathrm{pH}$ value of $2$ is measured for the aqueous mandelic acid ...
- 423
0
votes
1
answer
1k
views
I tested the effect of temperature on the pH of carbonated water but the results seem to go opposite to what was expected. Could anyone explain?
We carried out an experiment to investigate the effect of temperature on the acid carbonate equilibrium in carbonated water. We tested 5 different temperatures (room temp, 2 above and 2 below) by ...
1
vote
1
answer
97
views
Is it possible to (naturally) change alkalinity without changing pH?
The Bjerrum plot shows how the different species of dissolved inorganic carbon (DIC) are distributed in sea water as a function of pH. The higher the pH, the more carbonate ion, less dissolved $\ce{...
- 135
1
vote
2
answers
854
views
How to calculate the pH value of a Carbonate solution?
I read the similar questions suggested when submitting my question but they didn't help me How can one calculate the pH of a solution? How to calculate pH of the Na2CO3 solution given ambiguous Ka ...
- 423
0
votes
2
answers
174
views
Purpose of a pH Problem
I was doing a multiple choice question as follows.
The pH scale measures the
Strength of an acid
Concentration of hydrogen ions
Strength of hydrogen ions
Concentration of an acid
The answer is 2 but ...
- 221
0
votes
1
answer
2k
views
How do you calculate percentage acidity?
I am looking to calculate the percentage acidity of different drinks for the purposes of devising cocktail recipes. According to Liquid Intelligence by David Arnold, the optimum acidity level is 0.7-0....
- 177
3
votes
1
answer
396
views
Finding the pH of a solution from neutralizing hydrochloric acid and potassium hydroxide
What is the pH of the solution if $\pu{30.58 cm3}$ of hydrochloric acid ($\ce{HCl}$) with a concentration of $\pu{0.2855 mol dm-3}$ and $\pu{29.41 cm3}$ of potassium hydroxide with a concentration of $...
- 141
0
votes
1
answer
191
views
What happens when you mix a salt with a strong base? [duplicate]
This doesn't come off from a question but it came to my mind. Take an example of $NH_4Cl$ as the salt and $NaOH$ as the strong base. What would happen to the pH for example? I'm guessing that the salt ...
- 39