All Questions
Tagged with acid-base inorganic-chemistry
438
questions
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What is the basicity order of peroxide, superoxide and hydroxide anions?
My teacher told me superoxide and peroxide anion are more basic than hydroxide but according to Wikipedia
Given that the hydroperoxyl radical has a pKa of around 4.8
and and pKa of H2O is
Acidity (...
- 543
8
votes
2
answers
1k
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How to separate Cu and Ni from alloy containing different metals such as Al, Cu, Ni, (Zn, Pb, Sn < 5%)?
I have an alloy containing different metals such as Al, Cu, Ni, (Zn, Pb, Sn, Ag, Si in small amount < 5%). How can I separate Cu and Ni from this alloy?
I tried to dissolve alloy in sulfuric acid, ...
- 99
0
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0
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135
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Towards a hard Lewis base like water which is the stronger Lewis acid, silicon tetrachloride or tin (IV) chloride?
On Pauling scale, both $\ce{Si}$ and $\ce{Sn}$ have electronegativity value of $\mathrm{1.9}$. The difference is in size of d-orbitals which accept lone pair of electrons. $\ce{Si}$ has vacant 3d-...
- 1,280
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1
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119
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How exactly does a buffer made up of a weak acid and its conjugate base work upon addition of hydroxide ions? [duplicate]
Consider a buffer solution containing a weak acid and its conjugate base ($c_\mathrm{total} = \pu{0.1 mol L-1}$):
$$\ce{HA <=> H^+ + A^-}$$
When $\ce{H+}$ ions are added (from a strong acid), ...
- 551
3
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0
answers
156
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What is the relation between strength of a base and the thermal stability of its salts?
In Concise Inorganic Chemistry, $5^{th}$ edition, by JD Lee, while discussing oxides and hydroxides of Group $2$ metals, it has been stated that:
The increase in basic strength is illustrated by the ...
- 629
-3
votes
1
answer
537
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How to calculate Kp without knowing the volume? [closed]
I have the following chemical equation:
$$\ce{Sb2S3 + 3H2 <=> 2 Sb + 3H2S}$$
I have $\pu{1000 grams}$ of $\ce{Sb2S3}$ that reacts with $\pu{10 grams}$ of $\ce{H2}$ in a reactor at $\pu{713 K}$.
...
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0
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278
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Passivation of metals in acids
It is commonly taught in chemistry textbooks that metals such as $\ce{Fe, Al, Cr}$ is "passivated" in cold concentrated $\ce{H2SO4}$ and $\ce{HNO3}$ due to them forming oxide films on the ...
- 482
3
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1
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2k
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How to determine the equivalents of OH- in a titration curve
How does one go about determining the equivalents of $\ce{OH-}$ needed for the titration of a weak acid. For example here is the titration curve for Aspartate:
Why is the equivalents for $\mathrm{p}...
- 67
-1
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2
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87
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Decalcifying metal tubes using organic acids
I have a water that is saturated with Calcium Magnesium Carbonate $\ce{CaMg(CO3)_2}$ (Dolomite). This precipitates in particularly metal pipes and whenever the water is heated. Instead of ion exchange ...
3
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1
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2k
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How can I prove ascorbic acid degradation with Uv-vis spectroscopy?
I have to prove scientifically why a sodium ascorbate solution in water turns yellowish - reddish over time. I know ascorbic acid is supposed to oxidize into dehydroascorbic acid, and the latter then ...
- 31
6
votes
1
answer
968
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Boiling sodium hydroxide in stainless steel cup: Solution turning to a blue color
I boiled highly concentrated sodium hydroxide in a stainless steel cup. This created a blackish layer on the bottom of the cup and turned the colour of the sodium hydroxide solution to blueish.
Am I ...
- 63
0
votes
1
answer
217
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Qualitative analysis of the anionic part of a salt using it's soda extract [closed]
While testing for anions using dilute $\ce{H2SO4}$, we prefer using the soda extract for tests rather than the actual salt. But we don’t use it for tests of carbonates, bicarbonates and sulphites. Why ...
- 445
-2
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1
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158
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Concentration of weak acid neutralized by strong base [closed]
I've got a question that should be simple enough but I must be doing something very wrong.
A $\pu{10mL}$ sample of $\ce{H2SO3}$ is neutralized by $\pu{18.6mL}$ of a $\pu{0.10M}$ strong base. Find the ...
2
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0
answers
33
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Titration of weak acid and strong base at low concentrations [duplicate]
Titration continues until one of the reactants (the one in conical flask) turns out to be a limiting agent as far as I know. From the titration of a weak acid and a strong base, I could learn that the ...
- 165
2
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0
answers
31
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About the acidity of Sultiame [closed]
Why is sulthiam base even hough sulfur can accept the electron by resonance from nitrogen
like carbonyl group do?
- 29