redgy

Most popular questions and responses by redgy
  1. chemistry

    What chemical reaction is responsible for the endpoint observed when the NH3/NH4Cl buffer solution is titrated with HCl? Write a blanced ionic equation for the reaction.

    asked on March 27, 2011
  2. chemistry

    Explain why methanol spontaneously evaporates in open air at 25.0 . I know that a negative delta G means a spontanious reaction, but I don't think this is an adequate response to this question. I need a little more clarity about this. thanks

    asked on April 16, 2011
  3. chemistry

    Calculate the percent ionization of a 0.15 formic acid solution in a solution containing 0.11 potassium formate. I have the formic acid Ka=1.8 *10^-4 When I solve for "x" I'm getting 1.1.44*10^-2 When I plug that into equation (x/0.15-x)*100, I'm getting

    asked on March 31, 2011
  4. chemistry

    When acetone is added to saturated sodium chloride, the equilibrium shifts toward the right. What is the role of acetone in shifting the equilibrium toward the right? any help would be appreciated. My TA is of no use in explaining our lab experiments.

    asked on February 27, 2011
  5. chemistry

    This is from a "effect of pH on the solubility of Ca(OH)2" lab: If excess Ca(NO3)2 were present, what effect would it have on the solubility of Ca9OH)2? also, in a "effect of comlex ion formaiton on the solubility of NiCO3" lab": If HCl(aq) were added to

    asked on March 27, 2011
  6. Cheistry

    When acetone is added to saturated sodium chloride, the equilibrium shifts toward the right. What is the role of acetone in shifting the equilibrium toward the right? any help would be appreciated. My TA is of no use in explaining our lab experiments.

    asked on February 27, 2011
  7. chemistry

    We titrated Sprite with 0.1051 M standard NaOH. I've ploted three different titrations and am supposed to use the titration curve to identify the acid. I assume the acid is Citric since it's Sprite, but the lab manual also says "to recall that two K values

    asked on March 21, 2011
  8. chemistry

    Why would it not be useful to just use pure ethanol or pure ethylene glycol as an antifreeze since their normal freezing points are -114.1 C abd -12C respectively.

    asked on February 14, 2011
  9. chemistry

    find the pK for the following ionization constants, K= 1.8*10^-5 and 1.1*10^.2

    asked on February 28, 2011
  10. chemistry

    calculate the necessary amounts of solutes and solvent to make a 4l bottle of antifreeze that will have a 35 degree change in the freezing point of water. soultes are: Al2(SO4), KBr) and Mg(NO3)2.

    asked on February 13, 2011
  11. chemistry

    Balance each of the following redox reactions occurring in acidic aqueous solution.Express your answer as a chemical equation. Identify all of the phases in your answer. Zn(s) + Na(aq)-> Zn2+(aq)+Na(s) Cl-(aq) + 2NO3-(aq)->NO(g)+Cl2(g)

    asked on April 23, 2011
  12. poetry

    I'm trying to understand the meaning of Tom Dent's poem "secret messages" (for Danny Barker). What is he trying to say? I'm thinking in the first stanza, the rain is washing away the past and "bad" history of blk mammies chained to praline shops, but past

    asked on March 26, 2011
  13. chemistry

    Based on their molecular structure, why are these acids thes stronger of the two binary acids given? HCl stronger than HF HF stronger than H2O H2Se stronger than H2S Is this because of bond strength due to placement on the table of elements? thanks

    asked on March 25, 2011
  14. chemistry

    Why should the volume of standard base (or acid) needed to reach the equilvalence point in a titration be more than 10.0 mL?

    asked on March 20, 2011
  15. MATH

    Suppose the annual expected mortality rate from coronary disease is 500 per 100,000 individuals. In a specific community of 600,000 individuals, how many deaths are expected to be attributed to coronary heart disease over a one year period? my work:

    asked on July 14, 2016
  16. MATH

    true or false: log (x-y) = log (x) - log(y) I don't know the the first part, but looking at the second part, wouldn't log (x) - log (y) = log x/y so based on that the first part is false?

    asked on July 14, 2016
  17. chemistry

    Based on their molecular structure, how can you figure out which is stronger between two oxyacids? Our textbook is really vague. I thought it had to do with which had more oxygen but one of the question compares CH3COOH and CCl3COOH so now I'm lost again.

    asked on March 25, 2011
  18. chemistry

    If the pH of a 1.00in. rainfall over 1400 miles^2 (square) is 3.20, how many kg of sulfuric acid, H2SO4 are present, assuming that it is the only acid contributing to the pH?

    asked on March 24, 2011
  19. calculus

    find f'(x) for the following: f(x)= cos^5(4x-19) I keep getting 20cos^4(4x-19)sin, but the answer is supposed to be -20cos^4(4x-19)sin(4x-19). I can't seem to get there with derivatives

    asked on March 16, 2011
  20. calculus

    using L'Hospital's rule, evalutate; LIM as x->0 e^x +cos x / e^x + sin x I'm at LIM x->0 e^x+cosx / e^x +sinx but now I at a lost as to how to proceed.

    asked on November 21, 2011
  21. calculus

    let xy + x^2 = x find y'

    asked on October 29, 2011
  22. chemistry

    For the ionization of a weak acid, HA: a) give the expression for Ka. b) after taking the log 10 of both sides ofthe quation in "a" sp;ve fpr pH. c) under what conditions would pH be equal to pK?

    asked on February 28, 2011
  23. chemistry

    In deciding which has more entropy, would it be correct to say s

    asked on May 1, 2011
  24. chemistry

    What is the pH of a solution with [H+]= 4.75 x 10^-5? I set this up as: pH= -log[H+] =-log (4.75 x 10^-5) = 4.32 Is this the correct to solve this? thanks

    asked on March 21, 2011
  25. CALCULUS

    find f'(x) for f(x) = x/(sqrtx^2+1) please show all the steps. I'm realy confused on this one. I get as far as setting it up using the quotient rule then I go blank. thanks

    asked on March 16, 2011
  26. calculus

    Let 4xy^3 - x^2y= 5x - 6 - x^3 where y is a differential of X. Find y' in terms of x and y. I get: y'= -4y^3 - 2xy + 3x^2 -5 / x^2 -12xy^2 My answer handout shows the answer as positive. Which should it be, neg. or pos.? Thanks

    asked on October 29, 2011
  27. poetry

    What is the author, Andrei Codrescu, trying to saying in "A Leafy Angel?"

    asked on March 30, 2011
  28. organic chemistry

    How do I go from C-triple bond-C and end up with [(Z)-6 methylhept-2-enyl] benzene. I think the first step is adding NaNH3, but after that I'm lost.

    asked on October 26, 2011
  1. chemistry

    gottem' both. thanks anyway. I'm sure I'll have more questions on down the road.

    posted on April 23, 2011
  2. chemistry

    I figured out the Zinc problem, but still need some help with the other one.

    posted on April 23, 2011
  3. chemistry

    Thank you so much! I see what I was doing wrong now. I need more practice with these type problems.

    posted on April 1, 2011
  4. poetry

    actually all that matters is what my instructor thinks it means

    posted on March 30, 2011
  5. chemistry

    Thank you so much for ALL your help. You make it so simple and easy to understand.

    posted on March 26, 2011
  6. chemistry

    nevermind. I got it. it's 2.9 x 10^6 kg. but thanks anyway

    posted on March 25, 2011
  7. chemistry

    That does help greatly. Thank you so much!

    posted on March 21, 2011
  8. chemistry

    Okay, thanks. The choices offered are phosphoric acid, citric acid, a oxalic. Let me make sure I'm understaning you, for example: I have an equilvenc point at 4.80mL and the pH at that point read 6.93. So I should go to 3.5 and the pH at that point is

    posted on March 21, 2011
  9. calculus

    never mind. I figured it out. That is the correct anser, I didn't carry through with the derivitives.

    posted on March 16, 2011
  10. CALCULUS

    THANK YOU!!!!!!

    posted on March 16, 2011
  11. chemistry

    Now I can. Thanks. Our labe manual is an "experiment" for next year's classes, so a lot of info has been left out in error and we have to fend for our selves. I really appreciate the help.

    posted on February 28, 2011
  12. chemistry

    thank you!

    posted on February 28, 2011
  13. chemistry

    Yes, it does. Thank you!

    posted on February 27, 2011
  14. chemistry

    thanks

    posted on February 14, 2011