All Questions
Tagged with acid-base experimental-chemistry
124
questions
5
votes
3
answers
3k
views
Why isn't my galvanic cell making enough voltage?
I'm in kind of a pickle here. I made a galvanic cell of Lead and aluminium for a chemistry internal assessment but unfortunately, it didn't turn out so well and neither me nor my teacher has any clue ...
-2
votes
1
answer
567
views
How to standardise NaOH? [closed]
My aim is to "To determine the concentration of citric acid in lemon juice using titration technique." and as following i need to standardise the NaOH in order to titrate it with validity. Is there a ...
- 133
5
votes
2
answers
339
views
Should the tip of the burette of an automatic titrator be immersed in the analyte?
In all the tutorials I found online, the tip of the burette (containing the titrant - NaOH) was immersed into the analyte solution. My question is: shouldn't the tip be out of the solution? Isn't ...
- 151
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
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
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
6
votes
3
answers
655
views
Changes in pH when adding substances other than acids or bases
If I start out with 100 mM acetic acid, what substance (to a final concentration of 1 M) could I add to change the pH considerably? I was thinking of NaCl or ethanol or acetone. Substances added ...
- 41.2k
2
votes
0
answers
43
views
How to Separate Copper Nanowires in an Alumina Membrane
So, in my Chemistry Lab we had an experiment to use Whatman alumina membranes and GaIn eutectic to create Nickel nanowires through electrodeposition. So essentially Nickel wire electrode and alumina ...
- 29
-1
votes
1
answer
540
views
Different HCl concentrations and iron nails [closed]
Hey guys I am at high school and we have a project on designing our own lab.
My questions is will different concentrations such as 10%, 20%, 30% and 37% have an affect on the corrosion of an iron ...
- 1
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 ...
-1
votes
1
answer
2k
views
Why are ammonium chloride and ammonium hydroxide used in calcium salt detection?
On adding $\ce{ (NH4)2CO3 }$ solution to $\ce{ Ca^{2+} }$ aqueous salt solution, $\ce{ CaCO3 }$ is formed as a white precipitate, which confirms the presence of the cation.
While doing the test in my ...
- 547
0
votes
1
answer
167
views
pH calculation of HK2PO4
I am struggling with a calculation I should know how to do, but I feel like I may be missing crucial information. Here's the outline:
I dissolve $\pu{6.0 g}$ of $\ce{HK2PO4}$ in $\pu{20 mL}$ of water....
- 13
-1
votes
2
answers
5k
views
Lab Methods for Determination of Phosphoric Acid Concentration
Dear stack exchange,
For my next lab session we have been tasked to come up with two different methods for determining the concentration of an unknown sample of phosphoric acid.
Design at least ...
- 33
-2
votes
1
answer
507
views
Why does ammonium chloride form white crystals? [closed]
Why does ammonium chloride ($\ce{NH4Cl}$) form white crystals on top of a test tube when heated?
- 23
4
votes
1
answer
621
views
What type of gloves should be used while diluting sulfuric and hydrochloric acids?
What type of gloves should we use on hands while diluting sulfuric and hydrochloric acid?
Can we use these gloves in chemistry lab to handle other acids?
