5
votes
Acidity of metronidazole
As Waylander correctly predict that presence of no acidic groups in metronidazole framework. The reported $\mathrm{p}K_\mathrm{a}$ value is related to the protonated hydrophilic form of the molecule (...
- 39.5k
5
votes
Accepted
crystalline form of HCl
As has been mentioned, a compound with a bare hydrogen cation cannot exist. Salts derived from strong acids generally contain hydrogen ion covalently bonded to a neutral molecule, so the charged ...
- 53.2k
4
votes
Can a multimeter be used to measure PH?
A multimeter measures resistance, i.e., the blocking of electron (or ion) flow. A pH meter measures the voltage difference between glass-encased electrodes.
As you might realize, silica-based glasses ...
- 30.4k
2
votes
Calculating the pH after adding hydrochloric acid to the potassium hydrogen phosphate solution
There is initially $\pu{0.02 L} \cdot \pu{0.2 mol/L} = \pu{0.004 mol}\ \ce{HPO4^2-}$
There is added $\pu{0.01 L} \cdot \pu{0.25 mol/L} = \pu{0.0025 mol}\ \ce{H+}$
This leads to approximately $\pu{0....
- 39.2k
2
votes
Why this Lewis structure for HNO3 nitric acid is wrong?
The structure isn't incorrect. It just has a high formation energy.
Structure
Heat of Formation ($\pu{kJ mol^{-1}}$)
Reference
236.69
MolCalc
-159.02
MolCalc
Because of the low heat of formation ...
- 2,093
1
vote
How do I find pH of an extremely low molarity strong acid?
There are two possible questions here, which have very different answers.
Question 1 is what you actually posed here: What is the pH of a solution of nitric acid where $\ce{[HNO3]} = 4.53 \times \pu{...
- 817
1
vote
Why this Lewis structure for HNO3 nitric acid is wrong?
Structures with nitrogen atom bound to several oxygen atoms are generally energy rich, which would be boosted by the stress of three-member ring. Such rings are generally unstable and reactive. Also, ...
- 39.2k
1
vote
dilution and pH and pOH
If you started with a $\pu{10^{−12.3} M}$ solution of some inert material, then diluting it by a factor of 10 would indeed result in a $\pu{10^{−13.3} M}$ solution.
$\ce{H3O+}$ is not inert. It reacts ...
- 817
1
vote
dilution and pH and pOH
As Poutnik writes in the comments, the question does not have a single answer unless you specify the components of the solution.
Given that the pH is fairly basic at pH = 12.3, you could guess or ...
- 39.1k
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