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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. tha...

14 years ago

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

14 years ago

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?

14 years ago

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

14 years ago

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

14 years ago

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

14 years ago

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 value...

14 years ago

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

14 years ago

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?

14 years ago

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

14 years ago

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.

14 years ago

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...

14 years ago

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.

14 years ago

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...

14 years ago

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

14 years ago

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...

14 years ago

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)

14 years ago

In deciding which has more entropy, would it be correct to say s<l<g<aq or s<l<aq<g I'm thinking the second one....

14 years ago

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

13 years ago

let xy + x^2 = x find y'

13 years ago

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.

13 years ago

thanks

14 years ago

Yes, it does. Thank you!

14 years ago

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.

14 years ago

thank you!

14 years ago

THANK YOU!!!!!!

14 years ago

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

14 years ago

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 5.6...

14 years ago

That does help greatly. Thank you so much!

14 years ago

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

14 years ago

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

14 years ago

actually all that matters is what my instructor thinks it means

14 years ago

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

14 years ago

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

14 years ago

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

14 years ago