All Questions
Tagged with acid-base experimental-chemistry
12
questions
60
votes
4
answers
246k
views
Why add water first then acid?
From school, I remember a very important rule: first you need to pour the water and then the acid (when you need to mix them) not vice-versa. This is because otherwise the aсid becomes very hot and ...
- 1,053
10
votes
4
answers
8k
views
What is the real pKa of water?
What is the $\text{p}K_\text{a}$ of water? A simple google search yields the value $15.74$, but this site and this paper say it's $14.0$.
According to my understanding, the correct answer should be $...
- 601
5
votes
1
answer
28k
views
Copper and hydrochloric acid
When hydrochloric acid is added to a sample of copper why does it look pink at first then form a pale blue solution ?
- 51
4
votes
3
answers
11k
views
dissociation of aluminum sulfate in water
I had a question as to what happens when aluminum sulfate is placed into water. After conducting research online, I got varied answers: some say that it dissociates into Al$^{3+}$ and SO$_4$$^{2-}$ ...
- 864
3
votes
1
answer
12k
views
Making carbon monoxide gas from formic acid and sulfuric acid?
Can I create carbon monoxide gas by just mixing formic acid and sulphuric acid together? Or do they have to be heated?
- 31
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
12
votes
3
answers
13k
views
Why isn't dry CaCl₂ used to dry HCl gas instead of concentrated sulfuric acid?
In our chemistry books, it is said that concentrated sulphuric acid is used to dry $\ce{HCl}$ gas.
But, concentrated sulphuric acid is a strong oxidising agent so, why isn't $\ce{HCl}$ gas oxidised ...
- 1,232
3
votes
2
answers
42k
views
Mixing hydrochloric acid and sulphuric acid, both concentrated
In the chemistry lab, I stupidly decided to mix hydrochloric acid and sulphuric acid, both concentrated, in a random ratio, which was about $\pu{50 ml}$.
When I poured them in one test tube, the ...
3
votes
1
answer
1k
views
How Many mL of 1.0M HCl Would be Required to Completely Decompose Sucrose into Glucose and Fructose?
I am currently conducting an experiment into the glucose content of certain sports drinks. However, I have hit a roadblock. A majority of the drinks that I intend to test, contain sucrose. I am ...
- 133
1
vote
1
answer
3k
views
Can an iodine clock reaction work without using a strong acid?
I'm going to do an iodine clock reaction for a project and we had to submit the materials and safety sheets for the experiment a while ago. I thought I could do one by using hydrogen peroxide, sodium ...
- 11
1
vote
1
answer
6k
views
How do I make a 0.5 M citrate buffer at pH 4.5?
I need to make a citrate-sodium citrate buffer at 0.5 M concentration and pH 4.5. I calculated the molarities of the citrate and disodium citrate based on the Henderson Hasselbalch equation, using a p�...
- 19
0
votes
2
answers
3k
views
What will happen when a metal reacts with an acid which is neither dilute nor concentrated? [closed]
We have always studied about metals reacting with dilute and concentrated acids, but I do not understand what will happen if the same metal reacts with an acid that is neither concentrated nor dilute?
- 47