Recent content by ada15

Hey there, thankyou for the links , but do you know how to find the answers without using chemical calculator ... I've an exam tomorrow.

Homework Statement Which of the following mixtures would result in buffered solutions whn 1.0 L of each of the two solutions are mixed? (i) 0.10 M sodium chloride and 0.10 M sodium nitrite (ii) 0.10 M sodium chloride and 0.10 M ammonium chloride (iii) 0.10 M hydrochloric acid and 0.10 M...

Can you please help me with 1 more question ... please ! Question: What is the pH of a 0.620 M solution of CH_3NH_3+Br- if the p[SIZE="3"]Kb of CH_3NH_2 is 10.62 ? Relevant Equation: pKa = - log Ka pKb = - log Kb Attempt: I tried finding Kb ... but I think I used the...

thanks a lot !

Homework Statement Calculate the pH of the solution a) 23.0 ml of 6.29 M HCl is added to 160.0 ml of distilled water Homework Equations pH = -log [H] [SIZE="4"]Kw= [H][OH] [SIZE="4"]Kw = 1 x 10^-14 The Attempt at a Solution [SIZE="4"]For part a) I found the no.of moles...

Homework Statement CO(g) + NH_3(g) ...> HCONH_2(g) euilibrium constant is: K = 0.207 at 400 K If a reaction is filled with intial concentrations 2.20 M of CO and 2.60 M of NH_3 and the reactanats are allowed to raect at 400K/ what will be the concentrations of CO at equilibrium ...

Hi Guys, I have a question and its regarding to the freezing point depression lab ... I did an experiment where I had to find an "i" value for KCl. I'm getting 2.4 for "i" ... but the theoratical value is 2. I was just wondering why expriment value os higher than the theortical value ? what...

Hi, Do you calculate the energy by this formula; Q=CV Q= (0.25 * 10^-6) ( 50) Q = 0.0000125 C

thanks for the help.

now how do i know which method to use in these integrals ? :confused:

int x cos 5x dx int (lnx)^2 dx int arctan 4t dt int dx/5-3x

http://http://dl.uncw.edu/digilib/mathematics/calculus/integration/freeze/images/FundTheorems3.gif Lets say this question is given : Now how do you know which method to use ? Please can someone give me example and explain ... I have an exam tomorrow ... I am really really confused...

confused: http://www.math.ucdavis.edu/~kouba/CalcTwoDIRECTORY/usubdirectory/USubstitution.html

Hi, There are different ways by which we can integrate function : 1. Substitution 2. Integration by parts 3. Trigonomtery 4. Partial functions But how one know that which method to use ? Please can anyone explain how to figure out the way of doing integration? I'll be really...

i know that delta t is common in projectile motion but there is only delta d (x-component ) given and an angle, nothing else.. there is no velocity so i could use it with angle and calculate the sine law and cosin law..and not even time .. any answer