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Questions tagged [alkali-metals]

For questions about the alkali metals (group 1), their compounds, and their physical and chemical properties. For questions specifically about hydrogen, use tag [hydrogen] instead.

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Elemental sodium taste [closed]

I know the dangers of elemental sodium and how reactive it is particularly with contact with water, however it got me wondering would sodium metal taste bitter since it would probably make naoh upon ...
Shittykorean4banger's user avatar
11 votes
2 answers
615 views

Why doesn't sodium form organometallic compounds with alkyl halides?

Both magnesium as well as lithium, on reaction with an alkyl halide (say chloroethane), form an organometallic compound. However, sodium and potassium do not exhibit such a reaction. Instead of ...
Nightwing's user avatar
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Why exactly the stability of peroxides increase on going down the group [duplicate]

Why the stability of peroxides and superoxides increase down the group 1 and whereas the stability of oxides decrease down the group. The reason for one of them in my textbook is given as lattice ...
Kampann's user avatar
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Alkali-rich lead glass with working range at room temperature

I understand that the glass transition temperature (above which it is considered a super-cooled liquid) is quite far below the liquidus of the corresponding crystalline mixture. In the paper, "...
user145034's user avatar
-2 votes
1 answer
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Ionic Character of Metallic (Alkali Metals) Hydrides , and Reactivity

In my book , the following line has been written:- All the alkali metal hydrides are ionic solids with high melting points The ionic character , however, decreases from Li to Cs The reason being ...
Adhway's user avatar
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Potassium Ethoxide Synthesis: Does the Reaction Involve Radical Processes?

Can Potassium Ethoxide be obtained by reacting the alcohol with metallic potassium? Considering that potassium, as a group one metal, has only one valence electron, would this reaction therfore ...
Re7's user avatar
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2 votes
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Solubility of alkali and alkaline earth metal carbonates

The solubility of alkali metal carbonates increase down the group, while those of alkaline earth metals decrease down the group. We can explain the decrease in solubility of alkaline earth metal ...
wonderingwhy's user avatar
3 votes
1 answer
827 views

Why doesn't sodium bicarbonate dissolved in water spontaneously effervesce when carbonic acid does?

It's well known that if you put carbonic acid $\ce{H2CO3}$ into water it will dehydrate into carbon dioxide $\ce{CO2}$ and water $\ce{H2O}$. Indeed this is how modern fizzy drinks generate their fizz. ...
Hadi Khan's user avatar
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Na+ as an electrophile [closed]

In inorganic I learnt that s block cations are lewis acids but while learning attacking reagents in organic chemistry I came across the fact that Alkali metals are not electrophiles, why so?
Iyah's user avatar
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2 answers
136 views

Why is Li easiest to oxidise among the alkali metals despite having the greatest ionization energy 1 in the group? [closed]

If we use the magnitude of the IE1 as an indicator of ease of oxidation, Li is the most difficult of the alkali metals to oxidise. On the other hand, if E0redn (standard reduction electrode potential) ...
Henri IV's user avatar
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How does sodium react with methanol?

Strong acids of $\ce{AH}$ type readily dissociate to its constituent ions (considering the solvent is water): $\ce{A-}$ and $\ce{H+}$. But the mechanism of the reaction between sodium metal and ...
Chesx's user avatar
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Why do H and Li bond so differently with a hydroxide?

I am sure I am asking a very basic question but before coming here, I have made multiple attempts to find an answer elsewhere. Or maybe I am simply asking the wrong question, in some sense. If someone ...
Sergey's user avatar
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Combustion of Sodium (Na) Metal in presence of Excess Air [duplicate]

There was a question which I was recently solving regarding the products formed after combustion of Sodium Metal in presence of Excess Air. The given answers were Na2O2 (sodium peroxide) and Na2O (...
Hydro_7's user avatar
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Dissolution of portlandite, calcite/CaCo3 phase and C-S-H due to high pH

I would like to ask about the possibility of the partial dissolution, over curing time, of portlandite, CaCo3 and C-S-H phases due to high pH (12.5 - 13) of the lime-clay-water systems (lime-...
Makeen's user avatar
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3 votes
2 answers
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What kind of solution is formed when alkali metals are dissolved at high concentration in liquid ammonia?

When an alkali metal is dissolved in liquid ammonia, it results in the formation of a deep blue coloured solution. $$\ce{M + (x + y) NH3 -> M+(NH3)_x + e^-(NH3)_y}$$ The ammoniated electrons absorb ...
Shashaank's user avatar
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2 answers
245 views

Is it possible that the chemical composition of Greek fire could have been an alkali metal?

"Greek fire" was an ancient weapon used by the Greeks noted as being inextinguishable by water. The chemical composition of this weapon has been debated in the historical scholarship; due to ...
Dave's user avatar
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Why does the pH of very strong NaOH solutions not make sense? [duplicate]

I'm wondering why the pH of extreme alkaline solutions, such as the case with $\pu{10 M}$ $\ce{NaOH}$ does not make practical sense and I'm wondering why this is the case? Refer to my calculations ...
Hendrix13's user avatar
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1 answer
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What is the mechanism of sodium reacting with water vapor?

We all know that $$\ce{2Na +2H2O(g)->2NaOH +H2}$$ The question is: What is the mechanism (not the reason that sodium is more 'electropositive' or more reactive than hydrogen, as in this question; ...
Chrimpyslime's user avatar
-2 votes
1 answer
913 views

Comparison between Atomic Spectrum of Hydrogen and Alkali Metals

I posted a question on Chemistry Stack Exchange a while back. It was related to the naming of atomic orbitals. One of the answers to it mentioned a research experiment. The link to the question is ...
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Permitted composition of lithium oxometallate in lithium-ion battery and its influence on ion transfer

The following scheme describes the overall reaction that takes place in a Li-ion battery: $$ \begin{align} \ce{Li_{$y$}C6 &-> $y$ Li+ + $y$ e- + C6} &\quad &\text{(anode)} \tag{R1}\\ \...
Srihari P's user avatar
3 votes
1 answer
492 views

Is sodium superoxide more abundant than sodium oxide?

Reference(NCERT book of India); My professor has taught me that $\ce{Na2O}$ and $\ce{Na2O2}$ are the most common oxides of sodium, but in my reference book it is written that they are $\ce{NaO2}$ and ...
user avatar
-2 votes
0 answers
330 views

Why does Cesium have a higher Boiling point compared to Rb? [closed]

i know BP should decreese down the group as Cohesive energy decreeses down the group but i found out that cs>Rb in terms of B.P.. so what other factor is affecting this?
AVeC's user avatar
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Why is there a large increase in volume when an alkali metal is dissolved in liquid ammonia?

My teacher said unexplainedly that when alkali metals dissolves in liquid ammonia, there is a large increase in the volume. I found a paper that confirms this fact [1]: In the course of recent ...
TeslaBolt's user avatar
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1 answer
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Why is reaction of Li less vigorous than that of Na although the former has a more negative SRP value?

My textbooks says: It may be noted that although lithium has most negative E0 value (Table 10.1), its reaction with water is less vigorous than that of sodium which has the least negative E0 value ...
star's user avatar
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Will Lithium displace a sodium salt?

This question is based on a discrepancy I have observed in my limited knowledge about the reactivity and electrochemical series. In the reactivity series it is mentioned that Na>Li in reactivity ...
user avatar
-1 votes
1 answer
205 views

lowest melting point of alkali salts [closed]

I want to make the alkali metals sodium and potassium through electrolysis of molten salts. However, I only have the ability to heat stuff up to about 260 degrees Celsius. What would be the lowest ...
user16791137's user avatar
1 vote
1 answer
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Why are hydrated lithium ions' radii larger than hydrated sodium ions' radii?

Why are hydrated lithium ions' radii larger than hydrated sodium ions' radii i.e. $r_\ce{Li+(aq)}>r_\ce{Na+(aq)}$? If ionic radii increase down the group i.e. $r_\ce{Li+}<r_\ce{Na+}<r_\ce{K+}$...
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1 answer
1k views

Mixing hydrogen peroxide and sodium hydroxide doesn't lead to sodium peroxide anymore [closed]

I've been using same bottle of hydrogen peroxide and same bottle of 50 % of sodium hydroxide to make sodium peroxide for a month now. You could see the presence of sodium peroxide in the solution ...
Lubos Bocian's user avatar
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0 answers
192 views

Stability of Lithium hydride over Sodium hydride

Why is LiH more stable to heat compared to NaH? The lithium cation is harder than the sodium cation. The hydride ion is soft. Hence, I would assume that LiH would be more stable compared to NaH, owing ...
Prayag Ranjan Sahu's user avatar
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1 answer
1k views

Cobalt glass colour of potassium as

Question: Cobalt glass colour of potassium as: A) Crimson red B) Lilac C) Apple green D) Brick red I thought option B as true because on flame test, potassium gives lilac colour. But the given ...
Infinite's user avatar
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4 votes
1 answer
775 views

What is the colour of cesium?

I am confused with the color of cesium. Some websites and books say that it is a silvery white metal, and some say it has a golden colour, and some say it has a silvery golden colour. Among these ...
Infinite's user avatar
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0 votes
0 answers
70 views

Ease of reaction of hydrogen with alkali and alkaline earth metals

The ease of reaction of group 1 metals with hydrogen decreases as we go down the group. But why lithium requires high temperature than sodium, potassium and rubidium? What is exactly "ease of ...
Apurvium's user avatar
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4 votes
2 answers
520 views

Does lithium form ionic hydride? [duplicate]

It is stated in my chemistry textbook that lithium indeed forms lithium hydrides. However, significant covalent characters could be found in lithium hydrides (like least reactivity). But in some other ...
MsBonniePython's user avatar
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0 answers
62 views

Metal oxide formation minimum temperature?

Is there such thing as minimum temperature for creation of metal oxide? Let's say a highly reactive metal, lithium, comes into contact with solid oxygen at a cryogenic temperature of 20 Kelvin, would ...
Soliton's user avatar
  • 25
4 votes
1 answer
157 views

Why does fcc lithium melt with increased pressure?

According to the phase diagram of lithium given here, the fcc phase formed at moderately high pressure melts at decreasing temperature upon adding more pressure, an effect better known with the ...
Oscar Lanzi's user avatar
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2 votes
0 answers
59 views

Why is it that not all metals produce hydroxides when reacting with water? [duplicate]

I was taught, as a rule, that: metals + water $\rightarrow$ metal hydroxide + hydrogen gas $$\text{Na} + \text{H}_2\text{O} \rightarrow \text{NaOH} + \text{H}_2$$ However: $$3\text{Fe} + 4\text{H}...
Robinson's user avatar
1 vote
1 answer
459 views

Lithium Oxide Colour

According to Chemistry LibreText: Lithium is the lightest of all metals and is named from the Greek work for stone (lithos). It is the first member of the Alkali Metal family. It is less dense than ...
Shane's user avatar
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2 votes
2 answers
292 views

Can sodium metal deprotonate terminal hydrogen atom from propyne to form propynide?

I've read that sodium metal is used to form ethynides but for forming propynide, they have used $\ce{NaNH2}$. Is there some reason for not using sodium metal for propynides as well? Source: Chemistry ...
The Cuber's user avatar
0 votes
0 answers
77 views

Do positive results of a lead paint testing kit imply that a dipped door is now toxic?

We have had some 1930's doors dipped in a caustic solution to remove the paint. Before dipping, we found that a layer of yellow paint contained lead. It tested positive with: https://www.amazon.com/...
fadedbee's user avatar
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1 vote
0 answers
229 views

Ionic mobilities and conductivities of lithium and potassium cations in acetonitrile–propylene carbonate solution

Recently I calculated the ionic mobility and molar ionic conductivity values for $\ce{Li+}$ and $\ce{K+}$ cations in an acetonitrile–propylene carbonate binary mix solution (8:2 molar fraction ratio). ...
Ryksa's user avatar
  • 59
2 votes
0 answers
295 views

Why does conductivity of a solution of sodium in liquid ammonia decrease with a decrease in temperature?

What happens to the conductivity when a solution of sodium in liquid ammonia at $\pu{-33^{\circ}C}$ (Boiling point of ammonia) is further cooled? I expected the solution to behave as any other ...
Vamsi Krishna's user avatar
1 vote
0 answers
36 views

Can alkali-doped exohedral fullerene molecules show superconducivity?

Alkali doped fullerenes are one of the few organic materials that show superconductivity. However, when attaching a new molecular system to a fullerene doped with an alkali metal, will it still show ...
C-Consciousness's user avatar
6 votes
2 answers
2k views

Why is potassium less dense than sodium?

Potassium has a density of $\pu{0.86g/cm3}$ and sodium has a density of $\pu{0.97g/cm3}$,even though potassium is below sodium and one might expect the alkali metals to exhibit monotonously increasing ...
Bruh Moments's user avatar
1 vote
0 answers
50 views

What determines the consistency of hydrogen foam when reacting aluminium with sodium hydroxide solution?

I was using $\ce{NaOH}$ solution to remove hardened grease from my stove burners, and it began to generate a lot of bubbles, some of which merged into a big bubble and erupted into the surface, but ...
user2934303's user avatar
1 vote
0 answers
68 views

Significance of p functions in compounds of the lighter alkaline and alkaline earth metals [closed]

It is often said that lithium follows the duet rule instead of the octet rule, unlike the more "usual" main-group elements. My question is the following: Does this hold for $\ce{Be, Na}$ and ...
Kanghun Kim's user avatar
2 votes
1 answer
664 views

Do all metal nitrates give nitrogen dioxide on decomposition?

Some metal nitrates decompose to give nitrites: $\ce{2MNO3 -> 2MNO2 + O2}$ whereas some metal nitrates decompose to give $\ce{NO2}$. A possible reaction is $\ce{M(NO3)2 -> MO + NO2 + O2}$ Based ...
Ashish's user avatar
  • 1,409
1 vote
1 answer
368 views

What is the mechanism of formation of alkali metal superoxide?

I was studying about alkali metals. I can get how oxides and peroxides are formed. In alkali metal oxides, both of the bonds of the dioxygen molecule first undergoes homolytic cleavage, then the ...
Eclipse239's user avatar
0 votes
0 answers
275 views

Color of Flame Test for Alkali Metals

Lithium is known to have the highest ionization energy among Group 1 elements. Also, characteristic colours in the flame test arise due to the excitation and de-excitation of electrons. Then why ...
Chaitanya Garg's user avatar
2 votes
2 answers
930 views

Can you get potassium by reducing KCl with lithium?

I would have said that the answer was no, because lithium is less reactive than potassium is, so you would expect the reaction to go the other way: with potassium and lithium chloride reacting to ...
marktwo's user avatar
  • 445
0 votes
2 answers
730 views

why do we see characteristic colors of alkali metals in oxidizing flame?

I am a high school student and I am a little confused in a topic, My confusion is that: We know alkali metals and their salts imparts characteristic color in oxidizing flame, for example: Lithium ...
Arun Bhardwaj's user avatar