Recent content by 1question

I asked my Prof. It does not have an activity of 0.1M. Thanks for your help Borek.

It's an assumption so that I can draw a simplified Eh-Ph diagram. It is not meant to be generally correct I believe.

Homework Statement The question tells me that all dissolved iron species will have an activity of 0.1M. So is Fe(OH)42- considered a dissolved species of Fe, and if so, it will have an activity of 0.1M? Homework Equations N/A The Attempt at a Solution I want to say that it is not considered...

@ Spring. I figured it out already thanks to the link posted above. I appreciate the reply though!

Hi Mark. OK, I generally understand the idea, except for why you would do 2) in the first place. The sign is > not <, so why did you do both? Thanks. EDIT: I believe I understand the process now. http://tutorial.math.lamar.edu/Classes/Alg/SolvePolyInequalities.aspx is very helpful.

Hi. I'm having trouble understanding the logic behind finding a set of u for u(u-1) > 0. To solve these, I tend to factor as much as possible, then equate each expression to 0 (in this case to > 0) and solve, changing the > to < if I must divide by a negative number. I get u >0 and u > 1 but the...

It's just σ = F/A. I forgot that A is cross-sectional area.

Homework Statement In a simple mechanics question, which area should be used for a stress calculation? ex. A brick is compressed on 2 sides (opposite to each other) by a given compressive force F. The area of each of the sides being compressed is A. Homework Equations σ = F/A The Attempt at...

Oh, I see. Thanks.

Out of curiosity, why don't you like significant digits?

OK, great. Thanks.

Homework Statement 0.1004g of PbS, 14 mL of HCl, 3mL HNO3 are put in a 100mL volumetric flask, with deionized water filling up the remainder of the volume up to the mark. 5mL of this solution is added to a 250mL vol. flask in addition to 0.3g NaCl, 2.5g HCl, and deionized water filling up the...

@Borek Yes, the 3/2H+ on the right exists, I just didn't put it on here, sorry. Ah, I see. Thanks.

I solved it: Cu3AsS4 + 3/2HS- = 3/2Cu2S + AsS43- I can't believe I didn't see that earlier. Thanks for the reply! (Why can't I edit my post after a given amount of time? It would be nice to be able to grab the formatted stuff from there and change it to suit my current needs...)

Homework Statement Write the balanced chemical reactions in ionic and neutral forms for: i) Enargite leaching by sodium bisulfide in basic solution to form chalcocite and thioarsenate. ii) Oxygen pressure oxidation of As2S5 in acid solution to form scorodite. Assume all sulfide sulfur forms...