All Questions
Tagged with acid-base experimental-chemistry
124
questions
6
votes
1
answer
170
views
How do you experimentally calculate the ionization constant of the carbonate ion?
Given sodium hydrogen carbonate, $\ce{NaHCO3}$, as well as hydrochloric acid, $\ce{HCl}$, how would you experimentally determine the ionization constant for the carbonate ion, $\ce{HCO3-}$? By ...
2
votes
0
answers
689
views
Deprotection (debenzoylation) of glucose (sacharide) using NaOMe leads to hydrolysis glucose
I have a problem removing the benzoyl groups of my glucose moiety using sodium methylate (standard procedure). Indeed, the benzoyl groups are removed. However, a significant amount of glucose gets ...
- 21
0
votes
1
answer
191
views
Isolation of salt from solution
I just want to clarify my understanding of whether metathesis can be used to form other products by combining an acid and a base (do special rules apply whether its strong/weak acid/base)?
Say I ...
- 117
1
vote
0
answers
112
views
Does H+ in the ocean bind with water to form H3O+ or with carbonate ions to form HCO3-? [closed]
I've read so many references on the Internet about ocean acidification and basically it can be described by the following equations
This is when $\ce{CO2}$ dissolves into ocean to form $\ce{H2CO3}$: $$...
1
vote
2
answers
14k
views
Titration with Ca(OH)2
In the laboratory, $20.0$ milliliters of an aqueous solution of calcium hydroxide, $\ce{Ca(OH)2}$, was used in a titration. A drop of phenolphthalein was added to it to indicate the end point. The ...
- 205
0
votes
1
answer
4k
views
Why would the pH of a solution not be 7 at the equivalence point of an acid-base titration? [duplicate]
Is it because the new substance formed might be acidic/basic ?
The internet defines this point as when the number of moles of the acid equals the number of moles of the base. But if we have for ...
- 333
1
vote
0
answers
114
views
Is it true that un-dissociated HCl exists in dilute hydrochloric acid?
My book says that the equilibrium constant for $\ce{HCl + H_2O}$ is so high that the reaction goes to completion. But that does not make sense since the existence of an equilibrium constant for this ...
- 333
4
votes
1
answer
4k
views
Temperature change and gas evolution for vinegar and baking soda experiment
This is sort of 2 questions in 1, but I think they are related.
Could someone please explain why this endothermic reaction doesn't further decrease the temperature when the amount of baking soda is ...
- 43
-1
votes
1
answer
950
views
Why must NaOH be in excess if we wish to measure the effect acid strength has on the enthalpy of neutralisation?
A few different acids are given i.e $\ce{HCl}$ , ethanoic acid, $\ce{H2SO4}$, ethanedioic acid. We want to conduct an experiment in which we measure the temperature rise for neutralisation as a ...
- 485
3
votes
1
answer
9k
views
Why is sodium potassium tartarate used in Fehling's solution?
Why is this salt used specifically in Fehling's solution, instead of a simple disodium or dipotassium salt of tartaric acid?
- 470
1
vote
0
answers
3k
views
How to Prepare a 80mL Carbonic Acid-Bicarbonate buffer solution of ph=7.4 in laboratory? [closed]
I have the following materials which I can use:
0.1 M sodium bicarbonate solution
Sodium Bicarbonate powder
0.1 M HCL
Distilled Water
Universal Indicator
It will be a great help if you can provide ...
- 11
22
votes
3
answers
3k
views
How was it concluded that the H3O+ rather than H+ is the "acid" ion?
I suspect that initially, scientists believed that the acid ion was $\ce{H^+}$ since $\ce{H2}$ is released through electrolysis, right? But what experiment was done to change the standpoint to assume ...
- 369
8
votes
1
answer
1k
views
The open circuit voltage of a battery: Does it decrease with increase in pH of electrolyte while the voltage across a load increase?
Why does the open circuit voltage of a battery decrease with increase in $\mathrm{pH}$ of electrolyte, but the voltage across a load increase?
I tested a cell which had aluminum sulfate as its anode ...
- 864
8
votes
2
answers
16k
views
Why, in titration, is universal indicator not commonly used?
My teacher said that we always used indicators such as methyl red, methyl orange, litmus, phenolphthalein, etc. rather than universal indicator. I don't understand why, though, would not universal ...
- 309
3
votes
1
answer
559
views
How to measure/know the moles of carbon dioxide (as dry ice) when in KOH solution
I am doing an experiment where I am dropping dry ice in a $\ce{KOH}$ solution. I want to know how I can figure out how many moles of $\ce{CO2}$ reacted with the $\ce{KOH}$. I am pouring $25 \,\mathrm{...
- 864