Summary:: finding concetrations
[Thread moved from the technical forums]
i did a lab experiment and i'm a little confused about what i should do.
i got a solution of CaCl(2) 1.5 gr and Ca(OH)2 5gr in 100ml that i prepared 2 weeks ahead
. after filttering the solution i got a saturated...
last week i did a chemistry lab. i mixed NaOH 0.03M with equal part of methyl violet and mesured aborbance in a spectrophotometer. then i did the same thing with a 0.05M and methyl violet
i did today the graphs and got the k' =-0.1647 for the first solution and k'=-0.4022 for the second...
i found the pka=4.8 so the ka is 1.58*10^-5.
i guess the big issue i have is understanding what equation i should use. i attached what idid so far ,can you give it a look and tell me where i am wrong?
Summary:: finding ml of two solutions by the final pH
i have a NaOAc 0.1M and HOAc 0.1M , together the volume of the solutions is 20ml and the pH is 4. I need to find the volume of each solution.
I've tried to solve it for hours with no successes. i found the H+ concentration (-log(h)=4 ), it...
an element (we will call it X) got a cofiguration of 1##s^2##2##s^2##2##p^6##3##s^2##s##p^3## what molecule is moste likely to happend between this element and Mg?
1.MgX
2.##Mg_2##X
3.Mg##X_2##
4.##Mg_3## ##X_2##
how do i do it?with lewis structure?just check what structure makes the most...
No
That's what I intended to do.
But my problem is with the one that can be x∈(0,δ) (when are δ>0) so that f'(x)=0 and then f(0)=f(x)=0 for ∀x∈(0,δ) And then what I have to prove is wrong.
Do you understand my problem?
What I wanted to do was set f(x)=##x^2##/2 - xcosx+sinx And show that f(x)>0.
f'(x)=x(1+sinx)
First I wanted to prove that f(x)<0 in the interval (0,∞)
0≤1+sinx≤2
And thus for all x> 0 f'(x)≥0 and therefore f(x)≥f(0)=0
And it doesn't help me much because I need to f(x)>0
I meant what you wrote here.
If you don't understand what I wrote, tell me and I'll upload a photo of the inequality.
Because I can't post it with the forum tools
I'm sorry I didn't write the problem to the end.
Yes I meant it #<## a_n+1##<##\frac a_n a_1 ##
Prove that if for every n is Happening ## a_n+1##<##\frac a_n a_1 ## then a1<0