Easy Acid-Base titration problem i think

  • Thread starter Thread starter gotmilk954
  • Start date Start date
  • Tags Tags
    Titration
AI Thread Summary
In a chemistry forum discussion, a user expressed frustration over missing an A on their final exam due to two specific questions related to a titration problem involving 50 mL of 0.053M HCl and 0.080M KOH. The user calculated that 33.1 mL of KOH was needed to reach the equivalence point but was marked incorrect. Additionally, they stated that the pH at the equivalence point should be 7, which was also marked wrong. Other contributors agreed with the user's calculations, suggesting that the answers seemed reasonable, with some noting that the pH could be slightly below 7 due to the nature of the strong acid-strong base reaction. The consensus was that the user deserved a better grade, indicating a potential error in grading or expectations for the exam.
gotmilk954
Messages
4
Reaction score
0
Easy Acid-Base titration problem... i think URGENT!

So i just got my final exam for chem 2 back and i missed an A by two question. The thing is these two questions i was for sure i got right but apparently i didnt... here they are:

Use the following information: 50 mL solution of 0.053M HCL is titrated with .080M KOH
(I assumed a strong acid strong base titration)

First question:
How many ml KOH are needed to reach the equivalence point?
I put 33.1 mL which was wrong

Second question:
What would be the pH at the equivalence point?
I put 7 which was wrong

Any help?
 
Chemistry news on Phys.org


No help, I get the same answers. Odd.
 


33.1mL looks OK, final pH of 7 looks OK as well.

I can see a reason why final pH should be 6.98 or 6.99, but I doubt you were expected to dig that deep.
 


Third to attest the correctness of your answers. You deserve an A, so something's up.
 

Thread 'Solubility of MgSO47H2O in water'

It seems like a simple enough question: what is the solubility of epsom salt in water at 20°C? A graph or table showing how it varies with temperature would be a bonus. But upon searching the internet I have been unable to determine this with confidence. Wikipedia gives the value of 113g/100ml. But other sources disagree and I can't find a definitive source for the information. I even asked chatgpt but it couldn't be sure either. I thought, naively, that this would be easy to look up without...
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 »

Similar threads

Chemistry Are there typos in this snippet causing confusion?
Replies
2
Views
1K
Equivalence point in acid-base titration
Replies
3
Views
2K
Need opinion on titration question
Replies
1
Views
2K
Chemistry Comparing methods of computing pH at equivalence point in titration
Replies
4
Views
1K
Solving Titration Problems: NaOH + Oxalic Acid
Replies
5
Views
2K
Chemistry A seemingly simple titration problem
Replies
4
Views
1K
Why does [HA]=[A-] halfway thru a titration?
Replies
3
Views
11K
How can I prepare a 0.1M NaOAc buffer at pH 5 using titration?
Replies
4
Views
5K
Why Does the Growth-Rate of a Titration Curve Vary?
Replies
4
Views
14K
Something that doesn't make sense to me about calculating the pH
Replies
14
Views
3K

Hot Threads

Recent Insights

Back
Top