Base Definition and 586 Threads

This is an example in my book. I have the answer for it, but I don't know why my answer was wrong. Here's the question: Lauren pours 40 mL of .1M NaOH into 100 mL of Megan's .1 M HCl. What is the pH? Here's what I did: R NaOH+HCl ⇔ NaCl + H2O I .004 , .01 ⇔ 0 0 C -.004 , -.004 ⇔ +.004 ...

Hi! Another Physics homework question that needs solving immediately! Thank you in advance. A computer base unit of mass 7.5 kg is dragged along a smooth desk. If the normal contact force is 23 N and the tension in the arm of the person dragging it acts at 23° to the horizontal, then what is...

If an ammonium ion is bonded to let's say chlorine for simplicity sake, and NH4Cl is created, can nitrifying bacteria come in and still create nitrites and nitrates from the ammonia if it is bonded to the chlorine? I am asking this because I am planning to make a schematic for an aquaponics...

Hi! I was wondering what happens with Base current direction if NPN BJT works in reverse active mode? In forward active and in saturation mode currents are like this: Collector and emitter currents in reverse active mode would be in opposite direction: :

is e^{2 \ln{|x|}} = |x^2| or x^2?

Homework Statement In the following common base circuit,β=100.If Vcc=15V, VEE=4V,RE=3.3KΩ, Rc=7,1KΩ find the Ibq and Vceq(they are related to the dc values of the Q point) Homework EquationsThe Attempt at a Solution Well ah...i mainly want to ask some things.However knowing that i must...

I think Alain Connes, Ali Chamseddine, and Slava Mukhanov have scored a big hit with the November 2014 paper titled Geometry and the Quantum: Basics. I'll try to explain bit by bit what is going on with that paper, and will appreciate additional understanding and explanation others may wish...

I am not getting Potassium hydrooxide is nucleophile or base?If it is oh minus is stable ,it will be nucleophile and if not it would be base.

Homework Statement How does one determine the amplitude of the force transmitted to the base of a beam? Homework EquationsThe Attempt at a Solution The ODE modeling displacement is $$ -0.000891(9.60875\sin(183.26t) - 323.778\sin(5.4386t)) $$

Homework Statement Problem: I am told that the first mechanism is operative in saponification. The Attempt at a Solution However, this strikes me as wrong because the first mechanism involves the formation of dianion. Using hydroxide ion to abstract a proton and make that particular...

Homework Statement Here's the problem: Mod note: the last line is extraneous, and unrelated to this problem. Homework Equations Definition of e (1-1/n)^n, etc. The Attempt at a Solution [/B] My question is this: a) When do you know to use e in a situation like this? Is it when you have...

Homework Statement A 50.0 mL sample of a 1.00 M solution of a diprotic acid H2A (Ka1 = 1.0 × 10–6 and Ka2 = 1.0 × 10–10) is titrated with 2.00 M NaOH. What is the minimum volume of 2.00 M NaOH needed to reach a pH of 10.00? (A) 12.5 mL (B) 37.5 mL (C) 25.0 mL (D) 50.0 mL Homework Equations...

Hi All, Please let me set things up before the actual question: I have a Lefschetz fibration ## f: W^4 \rightarrow S^2 ## , where ## W^4## is a closed, oriented manifold, and ## S^2## is the 2-disk. This f is a smooth map with finitely-many singularities {## x_1, x_2,..,x_n ##}, so that we have...

Let ##f:X\to \mathbb{Q}+i\mathbb{Q}\subset\mathbb{C}##, ##f\in L_1(X,\mu)## be a Lebesgue-summable function taking only finitely many values ##y_1,\ldots,y_n\in \mathbb{Q}+i\mathbb{Q}## on the sets ##E_1,\ldots,E_n## such that ##\bigcup_{i=1}^nE_i=X##, ##\forall i\ne j\quad E_i\cap...

Generally, How the ship motion is calculated base on MATLAB?

Homework Statement The suspension system of a car traveling on a bumpy road has a stiffness of ##k = 5\times 10^6## N/m and the effective mass of the car on the suspension is ##m = 750## kg. The road bumps can be considered to be periodic half sine waves with period ##\tau##. Determine the...

I've been doing something very wrong for a long time. ln|y| = kt+C e^{ln|y|}=e^{kt}+e^C y=e^{kt}+e^c which should have been e^{ln|y|}=e^{kt+C} y=e^{kt} \cdot e^C = Ae^{kt} Is the idea you are operating on the entire RHS and LHS side as a whole?

Hey guys, Im in the middle of a project and need help with the base for it. I have to develop a base for a rectangle 3 feet high by 2 feet wide by 6 inches deep. The front of the rectangle is 1 pound heavier than the back and will stand 2 feet off the ground. The base must be able to make the...

So I've been becoming pretty obsessed with base jumpers. However its a pretty dangerous sport and as it turns out (surprise) a lot of them die. I was just wondering how much force the human body can survive. Say a 90kg base jumper jumped off of a 900m mountain and their parachute failed to open...

Is there a good general definition of 0^z, where z may be complex? The cases where z is real (and positive, negative, or zero) are straightforward, but what if z isn't real? Are there arbitrary branch cuts involved, or is there some universal definition?

the base resistance in collector to base bias configuration is given by Rb=Vcc-Vbe-IcRl / Ib now , in a question only the value of Vceq is given & they found Rb as Rb=Vceq/Ib.! what is Vceq over here..?? and another quantity Icq is used..what are these two quantities..please explain a bit..

Does decrease in value of base-emitter voltage decreases collector current..?? As I studied that decrease in base-emitter voltage of some part of signal to lesser ammplification of that part due to smaller current..but how base emitter voltage is leading to less collector current.. because if...

So, out of curiosity, when you guys see log(x) do you assume base 10 or base e? Because I just wasted 2 hours of my life wondering how I got a problem wrong due to the fact that I assumed base e and the problem assumes base 10...:cry:

I was recently told that base Pi can only be speculation because it irrational. However the Euler formula uses e. e is the base of the natural log and yet it is a transcendental. So is it or is it not possible for an irrational and/or transcendental number to be used as a base?

So here's the familiar SI base units from NIST length mass time electric current thermodynamic temperature amount (mole) luminous intensity Something has been bugging me about this. For whatever reason I am thinking all quantities are calculated by just three on the list -...

Homework Statement How to find concentration of NaOH to titrate ASA with 30-40 mL I am doing a lab in which I need to use a base with a known concentration (a standard solution that I have to dilute to make a secondary standard) to react with an acid with an unknown concentration. I then have...

which is light doped in transistor, whether it is base or collector ?

A solid has a circular base of radius 3. If every plane cross section perpendicular to the x-axis is an equilateral triangle, then it's volume is I keep on getting 18 root 3. But the answer is 36 root 3. Could I get some help? Thanks.

8) An isosceles triangle has two sides of length 9x+3. The perimeter of the triangle is 30x+10 a) Determine the ratio of the base to the perimeter, in simplified form. State the restriction on x Thanks for your help!

Homework Statement To protect the lunar base against space and sun radiation, astronauts covered it with 4m thick layer of regolith (moon soil). However, they found that they level of radiation was still 50% higher than on the Earth's surface, which they want to match. How many more meters of...

Should I need more info than just the formula to know if acid or base? Why? I am really confused. What does R stand for? SORRY, I MEANT NR3. PLEASE IGNORE CH3NH3ClO2.

Homework Statement Homework Equations Maybe the step response equation? The Attempt at a Solution I don't really understand the difference between a and b, but he said part a was supposed to be quite easy. Is a just: mx'' = -k(x-y) - c(x' - y') or something along those lines...

Consider an oblique circular cone of altitude h, base radius R, with apex directly above a point on the base circumference. What is the mean length (& variance) for the set of all rays from the apex to points on or within the base circumference?

Given an aqueous solution (I'm omitting the subscripts): ## NH_3 + H_2O ←→ NH_4^+ + OH^- K_b ##Then we can also say: ## NH_3 + H^+ ←→ NH_4^+ K_b ## as well since they're equivalent reactions, right? They both have the same Kb value as a result, right? So then, ## K_b = \frac...

Homework Statement If (X,d) is a metric space. I want to show that the set of all open balls and \emptyset form a base.Homework Equations The Attempt at a Solution I know that we need to show that the union of all these sets (or balls) is the whole set. I feel like this is simple yet, I am...

I'm at one of those annoying stages where you know what the answer is, but you just can't seem to prove it... Would really appreciate some help with this one! The question is: What are the intervals where function f(x)=e2x-2ex is concave and convex respectively. I have derived f(x) to get...

Hi i have a general question concerning the behavior of a weak base NH3 in water. If we have a reaction between a weak base and water NH3 + H2O = NH4(+) + OH(-) NH3 is a weak base with respect to the base ,OH(-), produced from water. This means that the lone pair of OH(-) will Attack a...

hi i'm using Matlab/simulink to create a microgrid model which simulate dynamic control of power based on the loads. the loads are changing based on the realtime. I use several voltage sources to power the loads. I would like to be able to turn on/off the generator based on the loads. for...

I seem to have a problem understanding this: If 1% of a weak acid dissociates in pure water. I would assume that 99% of it’s conjugate base would dissociate to form HA in pure water, but this is not the case: I tried to set up a situation below: Please help me understand what I’m...

The attachment provided shows a frame in which a large fan is to be rested on. The fan has a weight of 6,060 kg and the location of the centre of gravity is shown in the attachment. I would like to know how to calculate the loads at each point. Could anyone please provide some help on this problem?

I wonder if anybody can point me to a good explication of the atmospheric Coriolis effect broken down into base forces. Most of the explanations I've seen are problematic, even flawed as far as I can tell, and they rarely talk about force vectors. I've seen demonstrations, for instance a...

Homework Statement Why do bases lose all of their hydroxides at once?Homework Equations N/A The Attempt at a Solution Polyprotic acids lose their hydrogen atoms in a step-wise fashion, but bases with multiple hydroxides do not do this. I'm not quiet sure why this occurs, but I think that...

Hi, I have an involute gear and measured co-ordinates of two arbitrarily chosen points (on the involute portion) of a tooth. Can I find out the base circle with this information? Thanks.

Hello, Ive been seeing it everywhere" NAOH is a strong base". But in order for it to be strong, it has to meet the requirements which are: -The Kb of the reaction 6qvtA.pngmust be high. This means that base strenght is not determined by the dissociation % of a substance. Now I ve seen a...

Homework Statement If y= 10^x, show by taking logarithms to base e that y = exln10 Homework Equations The Attempt at a Solution Well what I did was y= 10^x so ln y = xln10 they told me that y = exln10 so ln y = xln 10 , so ln y = lny so y = y so y= 10^x. The way I...

\:Homework Statement What is the pH when 10 ml of 0.1 M NaOH is added to 25 ml of 0.1 M H_{}C_{2}H_{3}O_{2}? Homework Equations pH = -log[H_{3}O] The Attempt at a Solution The main thing confusing me about this type of problem is that my teacher taught me a way which is different from the...

Why does $$ e^{C} = Ce ?$$

I have seen it thrown around a lot that the pH at which concentration of a conjugate base is at a maximum can be found by adding up the 2 pKa's whose reactions that base is involved in and dividing by 2. But I tried differentiating and this only appears to be the case for HA- maximum...

I just came across the hydrolysis of the salts and the formula pH=7+1/2(pKa-pKb) What's bugging me about this is how can this be independent of Concentration? I mean if we dilute it why won't it affect the pH? That means that even a negligible amount of such a salt can affect the pH of a...

Homework Statement A sand pile has an angle of repose of 35 degrees. If the pile is 2.4 meters high, find the area occupied by the base of the pile. Homework Equations Sine=opp/hyp Cosine=adj/hyp Tan=opp/adj a^2+b^2=c^2 The Attempt at a Solution Going off the Pythagorean...