Equivalence Point Calculation: Joe's Question

  • Thread starter Thread starter josephcollins
  • Start date Start date
  • Tags Tags
    Equivalence Point
AI Thread Summary
To determine the half equivalence point in a titration, it is essential to focus on the mole ratios rather than simply halving the pH or the volume at the equivalence point. The half equivalence point represents the stage where half of the total acid or base has been neutralized, which is crucial for calculating pKa using the formula pKa = pH. Therefore, the correct approach involves using the mole quantities rather than dividing the previously found pH or volume values.
josephcollins
Messages
59
Reaction score
0
Hi ppl, I was wondering. I have found the Equivalence point from the graph of volume versus pH for a given titration. To determine the Half equivalence point for to calculate Pka=Ph, do I half the pH or the volume which I found for the Equivalence point initially? Thanks for any help, Joe
 
Chemistry news on Phys.org
Dear friend,

Half equivalence in titrations means that the half mole of total acid or base is neutralized; it is not the half of pH value. Volume may be incorrect, so I recommend that you stick to mole ratios.
 

Thread 'Humidity of a saturated NaCl solution with anticaking additive'

I want to test a humidity sensor with one or more saturated salt solutions. The table salt that I have on hand contains one of two anticaking agents, calcium silicate or sodium aluminosilicate. Will the presence of either of these additives (or iodine for that matter) significantly affect the equilibrium humidity? I searched and all the how-to-do-it guides did not address this question. One research paper I found reported that at 1.5% w/w calcium silicate increased the deliquescent point by...
View full post »

Thread 'Why does having 8 valence electrons make an element inert?'

I was introduced to the Octet Rule recently and make me wonder, why does 8 valence electrons or a full p orbital always make an element inert? What is so special with a full p orbital? Like take Calcium for an example, its outer orbital is filled but its only the s orbital thats filled so its still reactive not so much as the Alkaline metals but still pretty reactive. Can someone explain it to me? Thanks!!
View full post »

Thread 'Resists for etching Aluminium with NaOH'

I'm trying to find a cheap DIY method to etch holes of various shapes through 0.3mm Aluminium sheet using 5-10% Sodium Hydroxide. The idea is to apply a resist to the Aluminium then selectively ablate it off using a diode laser cutter and then dissolve away the Aluminium using Sodium Hydroxide. By cheap I mean resists costing say £20 in small quantities. The Internet has suggested various resists to try including... Enamel paint (only survived seconds in the NaOH!) Acrylic paint (only...
View full post »

Similar threads

Can I combine an Acid dissociation with autoionization of H2O?
Replies
6
Views
2K
Why does [HA]=[A-] halfway thru a titration?
Replies
3
Views
11K
Chemistry How to calculate pH at equivalence point using this alternative?
Replies
7
Views
1K
Citric Acid pKa: Calculate pH of Molar Concentration
Replies
7
Views
9K
Chemistry Comparing methods of computing pH at equivalence point in titration
Replies
4
Views
1K
Isoelectric Point: Definition & Calculation
Replies
5
Views
3K
Calculate the HCl concentration in H2O from the conductivity
Replies
5
Views
6K
Calculating pKa from pH: Understanding Titration
Replies
3
Views
3K
Understanding Buffers: pKa, pH & Solutions
Replies
2
Views
5K
PH at the equivalence point
Replies
8
Views
13K

Hot Threads

Recent Insights

Back
Top