Monday
May 2, 2016

# Posts by fenerbahce

Total # Posts: 26

chemistry
What is the pH of a 0.250 M NH4Cl solution? Kb for NH3 = 1.8 × 10−5. Thank you.
August 21, 2012

chemistry
the cell is written like that in the report sheet so that's why I wrote it like that
July 23, 2012

chemistry
I have a question. For Fe|Fe^+2 (1M)| Cu|Cu^+2 (1M why did you use Fe^2+ ==> Fe^3+ + e Eo = -0.771 ? instead of: Fe ---> Fe^+2 + 2e ? thank you..
July 23, 2012

chemistry
I'm adding this to my previous question..in our textbook its says Ecell=Ecathode-Eanode. That's my values were smaller. But you added them. Will that make a difference? Should I do it the way you did it? Because they have to be bigger numbers? Thank you.
July 23, 2012

chemistry
the measured cell voltages are supposed to be smaller than the theoretical cell voltages, but when I'm calculating the theoretical cell voltages they are smaller. And I don't know why I'm getting these. Can you please check if I'm doing it right. Thank you. ...
July 22, 2012

chemistry
Calculate the reduction potential of the following solutions: a- 1 M CuSO4 b- 1 M FeSO4 c- 0.1 M CuSO4 I'm now the same answer as you. :( This is how I did it can you please check. a- Cu(s)---> Cu(aq) + 2e = -0.34 V SO4^-2(aq) + 4H(aq) + 2e --> H2SO3(aq) + H2O(l)= 0....
July 22, 2012

chemistry
July 20, 2012

chemistry
Please...how do you calculate the reduction potential for 1 M CuSO4? I've been trying for hours......!!
July 20, 2012

chemistry
Thank you very much..And I posted another question, the most important ones that I don't know how to do.
July 20, 2012

chemistry
******HOW DO YOU CALCULATE THE REDUCTION POTENTIAL OF 1 M CuSO4 AND 0.1 M CuSO4? NOTE: THE REDUCTION POTENTIAL OF 1M Zn(NO3)2 IS -0.76 V. I'M REALLY STUCK.
July 20, 2012

chemistry
NOTE I calculates by using the above example
July 20, 2012

chemistry
How do you calculate the theoretical cell voltage? 1) Zn|Zn^+2 (1M)| Cu|Cu^+2 (1M) okay so by looking at example this example Calculate the emf (voltage) for the following reaction: Zn(s) + Fe2+ → Zn2+ + Fe(s) Write the 2 half reactions: Zn(s) → Zn2+ + 2e Fe2+ +2e...
July 20, 2012

chemistry
How do you calculate the theoretical cell voltage? 1) Zn|Zn^+2 (1M)| Cu|Cu^+2 (1M) 2) Cu|Cu^+2 (1M)| Zn|Zn^+2 (1M) 3) Fe|Fe^+2 (1M)| Cu|Cu^+2 (1M) 4) Zn|Zn^+2 (1M)| Cu|Cu^+2 (0.1M) 5) Cu|Cu^+2 (1M)| Cu|Cu^+2 (0.1 M) Now 4 and 5 have different moles how do you calculate those ...
July 19, 2012

chemistry
but for example for question 4 Zn is 1 M and Cu is 0.1 M will that make a difference? and can you just do one example I want to see if I'm on the right track. Thanks.
July 19, 2012

chemistry
How do you calculate the theoretical cell voltage? 1) Zn|Zn^+2 | Cu|Cu^+2 2) Cu|Cu^+2 | Zn|Zn^+2 3) Fe|Fe^+2 | Cu|Cu^+2 4) Zn|Zn^+2 | Cu|Cu^+2 5) Cu|Cu^+2 | Cu|Cu^+2
July 19, 2012

chemistry
Ok How do I find the initial concentration of the acid?
July 15, 2012

chemistry
[NaOH]= 0.113M V of NaOH needed to titrate = 0.0037L V of unknown weak organic acid = 0.025L Find: The initial concentration of this weak acid.
July 15, 2012

chemistry
Run # Volume NaOH used (mL) 1 4.1 2 4.3 3 2.8 Concentraion of NaOH: 0.113 M pH of acid: 2.84 the questions are: #moles of NaOH: ? initial acid concentration: ? Determine the Ka and pka of the weak acid: ? So here is what I did: Shaked for several minutes about 1 g of the acid ...
July 15, 2012

chemistry
Ok. Thank you so much Dr. Bob
July 14, 2012

chemistry
Okay let me write it this way. I mixed 30 mL of 0.1 M Acetic Acid and 15 mL of 0.1 M Sodium Hydroxide and measured the pH. Then I added 5 mL of 0.1 M NaOH to this buffer and measured the pH. It's asking me: Show the calculations for the pH of the buffer before and after ...
July 14, 2012

chemistry
How do I calculate the initial concentraion of an acid?
July 14, 2012

chemistry
I how you answers this but what is "c" HAc? NaAc?
July 14, 2012

chemistry
Okay let me write it this way. I mixed 30 mL of 0.1 M Acetic Acid and 15 mL of 0.1 M Sodium Hydroxide and measured the pH. Then I added 5 mL of 0.1 M NaOH to this buffer and measured the pH. It's asking me: Show the calculations for the pH of the buffer before and after ...
July 14, 2012

chemistry
acetic acid: 0.1 M 30ml hydrochloric acid 0.1 M 5 ml sodium hydroxide 0.1 M 15 ml Buffer + 5ml of: 1.91 ph ph (measured): 4:52 ph HOW DO I CALCULATE PH(CALCULATED)? AND ALSO IT SAYS SHOW YOUR CALCULATION FOR THE PH OF THE BUFFER BEFIRE AND AFTER THE ADDITION OF HCL? COULD YOU ...
July 14, 2012

chemistry
if it doesnt exist should I write NH3 + H2O ---> NH4OH + HA ? thank you.
July 12, 2012

chemistry
1) Aluminum Chloride- Red- PH: 4.0 2) Sodium Carbonate - Violet- PH: 9.5 Ammonium Acetate - Yellow - PH: 6.5 the question is: explanation with equation to show hydrolysis Could you please help me thank you.
July 12, 2012

1. Pages:
2. 1