What is Equivalent: Definition and 1000 Discussions

Equivalent weight (also known as gram equivalent) is the mass of one equivalent, that is the mass of a given substance which will combine with or displace a fixed quantity of another substance. The equivalent weight of an element is the mass which combines with or displaces 1.008 gram of hydrogen or 8.0 grams of oxygen or 35.5 grams of chlorine. These values correspond to the atomic weight divided by the usual valence; for oxygen as example that is 16.0 g / 2 = 8.0 g.
For acid–base reactions, the equivalent weight of an acid or base is the mass which supplies or reacts with one mole of hydrogen cations (H+). For redox reactions, the equivalent weight of each reactant supplies or reacts with one mole of electrons (e−) in a redox reaction.Equivalent weight has the dimensions and units of mass, unlike atomic weight, which is dimensionless. Equivalent weights were originally determined by experiment, but (insofar as they are still used) are now derived from molar masses. Additionally, the equivalent weight of a compound can be calculated by dividing the molecular mass by the number of positive or negative electrical charges that result from the dissolution of the compound.

View More On Wikipedia.org
Recent contents Top users
  1. ddelaiarro

    Equivalent Pressure Washing Tests

    I have a washdown spec for a unit we are designing. We need to be able to withstand a maximum of 85 gpm through a 5/8" nozzle at 75gpm. Now, I don't have access to equipment that can mimic that scenario. What I'm wondering if can I use my average, run-of-the-mill, garden-variety pressure...
  2. D

    Why are the resulting moment and force vectors collinear?

    hello, I would like you to take a look at the picture below. My question is why it is states that de resulting moment vector is collineair with the force vector... This is my method to solve this kind of problems: *determine the moment about the three axis => than we now the 3...
  3. A

    Uniqueness and existence of simplified equivalent circuits

    I know this probably sounds weird, but I have a research problem that requires "random" analog circuits. Basically what this means is that I create Spice netlists by randomly adding linear and/or nonlinear components of random types with random node and parameter values. This works fine and I...
  4. B

    Derive a formula for equivalent resistance

    Is it possible to derive a formula for the equivalent resistance of n such sections in cascade? Show your analysis. Series: Reqv = R1 + R2 +...Rn Parallel: Reqv = 1/{(1/R1) + (1/R2) + (1/R3) +...(1/Rn)}
  5. M

    Engineering Finding Thevenin Equivalent Circuit for BJT Problem

    Homework Statement The question asks to find the Thevenin equivalent circuit as shown in the attachment. (It's a BJT problem, but I'm having difficulty with the first part). Homework Equations Where are terminal points I need to worry about when making it an open circuit? That's the biggest...
  6. S

    Thevenin Equivalent Circuits with Dependent Source

    May anyone please help with the method of getting Thevenin Equivalent resistance (RTH) for the attached circuit. I have already found VTH to be 8V. Sim
  7. Z

    Calculating Equivalent Resistance in a Hexagonal Prism Circuit

    Homework Statement All the wires on the front and the back hexagonal face (of the Skelton hexagonal prism) have resistance R. All the wires along the lines joining the vertices of two hexagons have resistance 2R. The equivalent resistance between P and Q as shown in the figure is The...
  8. M

    Equivalent Resistance: How to Rank Resistors from Highest to Lowest

    The question was to rank from highest to lowest equivalent resistance. This is what I came up with, but it was counted wrong and I don't understand why. http://i324.photobucket.com/albums/k327/ProtoGirlEXE/100_0687-1.jpg The equivalent resistance of resistors in series are added while in...
  9. Useful nucleus

    What are the crystallographically equivalent sites in a crystal unit cell?

    Given a crystal structure and the cell edges (a,b,c) , angles (alpha, beta, gamma) and the fractional coordinates of all atoms in the unit cell. Also given an arbitrary unoccupied site P by fractional coordinates (s1,s2,s3). How can I determine all the sites that are crystallographically...
  10. G

    Complex Analysis: Proving a function is equivalent to its series representation

    Homework Statement Compare the function f(z) = (pi/sin(pi*z))^2 to the summation of g(z) = 1/(z-n)^2 for n ranging from negative infinity to infinity. Show that their difference is 1) pole-free, i.e. analytic 2) of period 1 3) bounded in the strip 0 < x < 1 Conclude that they are...
  11. M

    Equivalent Resistance: Unravel the Mystery

    http://xkcd.com/356/ I'm clueless, yet curious.
  12. C

    Equivalent Impedance: Find Z=84.907-j20.12 ohms

    Homework Statement Find the input impedance Z. (i.e. Find Z equivalent.) Answer in the back of the book: Z=84.907-j20.12 ohms [PLAIN]http://img834.imageshack.us/img834/8508/circuit.png Homework Equations n/a ** j=sqrt(-1) The Attempt at a Solution I combined the 60-ohm, 50-ohm, and...
  13. L

    What is the function of the diode in the TL431 equivalent diagram?

    The TL431 is a widely used as reference for voltage regulation. But in some cases there is a R and a C in the TL431 loop. I googled for the euivalent diagram, its an opamp with a reference and a diode in the feedback loop(+ve terminal of opamp and Cathode). I don't understand the function of...
  14. A

    Equivalent resistance of a purely resistive network

    Homework Statement Calculate the equivalent resistance between the points X1 and X2. Homework Equations R series = sum of resistances R parallel = reciprocal of resistances The Attempt at a Solution I'm sorry I do not get any idea on solving the question. I have done it in the...
  15. P

    Calculating Equivalent Resistance

    Homework Statement In the circuit shown in the figure, R1 = 3.23 Ω, R2 = 5.19 Ω, R3 = 23.1 Ω, and V = 10.7 V. a) Determine a value for the equivalent resistance. http://img651.imageshack.us/i/p074figure.png/ Homework Equations Parallel is 1/R1+1/R2+1/Rn=1/Req Series...
  16. L

    I'm in year twelve (in New Zealand, equivalent to 11th grade I think)

    I'm in year twelve (in New Zealand, equivalent to 11th grade I think) and physics this year seems much harder than it was before. I usually got the equivalent of B's in physics last year, so I wasn't particularly great, and I want to get more A's this year (as eventually I want to be a...
  17. C

    Explaining Thevenin Equivalent?

    http://img69.imageshack.us/i/circuitf.jpg/ Can someone explain what was done to go from Figure 4 to Fig 5? I tried source transformations but I cannot simplify it to that.
  18. K

    Equivalent Resistance of a Ciruit

    1. Find the equivalent resistance of the circuit as shown in the diagram below; where R1 = 1 Ω, R2 = 2 Ω, R3 = 2 Ω, R4 = 4 Ω, R5 = 1 Ω, R6 = 1 Ω, and R7 = 2 Ω. http://img21.imageshack.us/i/prob06v2.gif/ http://img21.imageshack.us/i/prob06v2.gif/Homework Equations R(parallel) 1/R(total) = 1/R1...
  19. S

    Equivalent resistance in this network

    http://img571.imageshack.us/img571/3774/circuitb.png Uploaded with ImageShack.us For my a level homework i have to find the equivalent resistance in this circuit, i don't want anyone to do my homework i would just like to be pointed in the right direction. We have been doing a bit about...
  20. P

    Mechanical equivalent of heat problem

    A 20g lead bullet at 30°C and moving at 350m/s embeds itself in a wodden block. If 70% of the initial kinetic energy becomes internal energy of the bullet, what is its final temperature? My attempt: Ek = (mV^2)/2 = 1225J 70% of this energy = 857.5J So the available energy to heat...
  21. N

    Small signal equivalent circuit model for the HJFET?

    small signal equivalent circuit model for the HJFET?? hello all, Looking for small signal equivalent circuit model for the HJFET. can someone knows ? Please help me it's urgent... Thank you in advance, N
  22. A

    Equivalent definitions for the norm of a linear functional

    Can someone please explain why the following three definitions for the norm of a bounded linear functional are equivalent? \| f \| = \sup_{0 < \|x\| < 1} \frac{|f(x)|}{\| x \|}, and \| f \| = \sup_{0 < \| x \| \leq 1} \frac{|f(x)|}{\| x \|}, and \| f \| = \sup_{\| x \| = 1}...
  23. N

    Engineering Thevenin equivalent circuit parameters

    Homework Statement https://www.physicsforums.com/attachment.php?attachmentid=32837&stc=1&d=1299373667 Determine the Thevenin equivalent circuit parameters, VTh and RTh, referred to terminals A and B of the circuit shown below? Homework Equations The Attempt at a Solution My...
  24. A

    Equivalent Spring Constant in Series and Parallel Configurations

    Equivalent spring constant... Homework Statement This is a general doubt i have...when two springs of spring constants k1 and k2 are connected in series the equivalent k is given by 1/k=1/k1+1/k2 and when they are in parallel it is k=k1+k2...Now in these cases do we assume that the natural...
  25. A

    How to Calculate Equivalent Resistance in a Series-Parallel Circuit

    Homework Statement Find the equivalent resistance of the circuit as shown in the diagram below; where R1 = 4.0 , R2 = 3.0 , R3 = 1.0 , R4 = 3.0 , R5 = 2.0 , R6 = 4.0 , and R7 = 1.0 . [Ohm] Homework Equations Parallel and series resistance equivalence Req= 1/R1 + 1/R2 + 1/R3 ... etc...
  26. Saladsamurai

    Circuits: Thevenin Equivalent

    Homework Statement I need to find the Thevenin equivalent of the circuit shown: I found the open circuit voltage (VAB) by noting that VAB = V3 and used the voltage division V_{AB} = V_s\left ( \frac{R_3}{R_1||R_2 + R_3}\right ) = 12\V I am having a little trouble finding the short circuit...
  27. P

    What is the equivalent resistance across points a and b?

    1. find the equivalent resistance across points a and b The Attempt at a Solution I've used kirchhoff junction and loop rule to get a whole chunk of simultaneous equations but i can't seem to lay the finisher. Assigning I_1 to I_4 in the clock wise manner starting from the 5...
  28. T

    How Do I Calculate Equivalent Resistance Without Voltage?

    Homework Statement What is the approximate equivalent resitance of the five resistors shown in the circuit show below? http://img515.imageshack.us/i/circuit.png/Homework Equations The Attempt at a Solution How do I solve this without voltage given?
  29. J

    Show that if equivalent to

    Show that ... if equivalent to ... Homework Statement Show that ∫e-t2sin(2xt)dt (bounds: 0,∞) = e-x2∫eu2du (bounds: x, 0) Homework Equations THEOREM X. Let the integral F(x) = ∫f(t,x)dt (bounds: c, ∞) be convergent when a ≤ x ≤ b. Let the partial derivative ∂f/∂x...
  30. C

    What is the equivalent capacitance of the capacitors shown in the figure?

    Homework Statement The equivalent capacitance of the capacitors shown in the figure is 9.23 MicroF Homework Equations http://upload.wikimedia.org/math/2/f/5/2f5b978fd081ea63e204909addf3d028.png http://upload.wikimedia.org/math/f/a/3/fa34ce461e6988fd973081401cc9790c.png The...
  31. C

    Equivalent Resistance Calculation for Resistors in a Circuit

    Homework Statement Find the equivalent resistance between points A and B shown in the figure . Consider R1 = 4.8 Ohms, R2 = 2.5 Ohms, R3 = 3.7 Ohms, R4 = 4.4 Ohms, R5 = 4.1 Ohms, and R6 = 6.4 Ohms.Homework Equations The Attempt at a Solution I got 9.33 by adding resistors 3,4,5 in parallel...
  32. I

    Engineering How Do You Calculate Norton Equivalent Circuits in Electrical Engineering?

    Homework Statement Find norton equivalent circuit Homework Equations Rn=Rth The Attempt at a Solution Ok i got my R(n)=34 ohms because after you turn off independent sources the resistors are in series, then I short circuited a to be and I'm trying to use mesh analysis to solve...
  33. A

    Replace the emf+series resistance(s) by the Norton equivalent

    Homework Statement Write down the node-voltage matrix equation for the following circuit. Hence find the total power dissipated. (Hint: replace the emf+series resistance(s) by the Norton equivalents.) Homework Equations n/a The Attempt at a Solution The problem I'm having is that I...
  34. B

    Equivalent Capacitance of capacitors

    Homework Statement The equivalent capacitance of the capacitors shown in the figure is 9.26 uF http://session.masteringphysics.com/problemAsset/1122585/1/Walker.21.58.jpg Homework Equations Cseries = 1/Cs = 1/c1 + 1/c2 + ... Cparallel = Cp = C1 + C2 + ... The Attempt at a...
  35. Saladsamurai

    Circuits: Thevenin Equivalent Circuit

    Homework Statement Homework Equations The Attempt at a Solution I am not getting this at all. I know that I need to calculate the open circuit voltage Voc and the short circuit current Isc. I really have no idea how to find Voc. There is some conceptual leap I need to make...
  36. T

    Engineering Find equivalent resistance in this circuit?

    Homework Statement Find the equilivant resistance in the wheatstone bridge circuit. Here is a picture: http://sub.allaboutcircuits.com/images/00485.png Homework Equations The Attempt at a Solution I know R1 and R2 are in parallel and R4 and R5 are in parralel but I'm getting confused with R3...
  37. D

    Find Equivalent Resistance Across Rab: A Geometric Conundrum

    Homework Statement Find the equivalent resistance across Rab Homework Equations Series: Req=R1+R2...Rn Parallel Req=(R1 * R2 *...Rn) / (R1 + R2 +...Rn) The Attempt at a Solution its the geometry that is throwing me off in this problem. Starting on the left side, I want to put...
  38. B

    What is the Equivalent Resistance between Points A and B in this Circuit?

    Homework Statement The equivalent resistance between points A and B of the resistors shown in the figure is 27Ohms. Find the value of resistance R. Here is the diagram: http://session.masteringphysics.com/problemAsset/1122575/1/Walker.21.36.jpg Homework Equations Rseries =...
  39. I

    Finding equivalent mass moment of inertia for gear system

    Homework Statement Two masses, having mass moments of inertia J1 and J2, are placed on rotating rigid shafts that are connected by gears. If the numbers of teeth on gears 1 and 2 are n1 and n2, respectively, find the equivalent mass moment of inertia corresponding to theta_1. Homework...
  40. Saladsamurai

    Circuits: Draw Equivalent Resistance

    Homework Statement Man, I stink at circuits. I have to simplify the 1st circuit in the image below to an equivalent resistance. I am almost there, but I am unsure of how to relate the remaining 3 resistances. In the drawing, a subscript Ri||j denotes the equivalent resistance of the two...
  41. R

    Equivalent length of of column ?

    Equivalent length of of column ?? Homework Statement A Mild steel column has a cross section of 100 mm by 50 mm . Assuming a safety factor of 6 calculate the load that it can safely support? Homework Equations Rankines formula : W = Oc/K[1+a(AEe^2/I] The Attempt at a Solution...
  42. Y

    Thevenin Voltage and Resistance Calculation for Circuit with Current Sources

    Homework Statement Find the thevenin voltage and thevening resistance of the circuit. [PLAIN]http://img573.imageshack.us/img573/2525/thevening.png The Attempt at a Solution The posted answers for the question are 5v and 1k ohm. But I can't see how the thevenin resistance is 1k...
  43. A

    Searching for a Modern-Day Equivalent to Bell Labs

    I will be going to university next year and I've really fell in love with the idea of working somewhere like the old Bell Labs. What I want to know is... Is there a modern day equivalent to Bell Labs (anywhere in the world) or have I created an unattainable dream, rooted in a long forgotten...
  44. M

    Equivalent spring constant of rigid bodies

    Hello everyone. I have a problem...I'm calculating natural frequency of a standing cylinder. In order to do that, I need the ke - equivalent spring constant of that cylinder. ke = (EY * s) / (h) EY is Young's elastic modulus for material cylinder's made of s is the cross section of...
  45. Z

    Zoom in is equivalent to move forward?

    For the digital cameras, is the zoom-in is equivalent to move forward the camera? My simple camera gives me 5 level zoom in, it has 3X optical zoom, but it takes me to press the button 5 times to reach the highest limit. Can I determine the forward distance of each zoom-in button pressed...
  46. R

    What is the Equivalent Resistance for this Homework Statement?

    Homework Statement [PLAIN]http://img502.imageshack.us/img502/6081/93069832.jpg
  47. G

    Finding equivalent forms prior to integration

    I've been trying to create a program that takes a user supplied indefinite integral and integrates it using the methods I have been learning in my calculus class; substitution, integration by parts, trig substitution, partial fractions, elementary anti-derivatives, etc. I've been trying to use...
  48. R

    Thevenin Equivalent with a dependent source

    Find the Thevenin Equivalent circuit between A and B the circuit is in the attachments... i don't know how to start and don't know what it meas "Between A and B" and i never encountered a problem with a dependent source. Thanks...
  49. B

    Is There a Neutron Equivalent of the Proton Activation Data File?

    The proton activation data file/s contain the target and product data plus the cross sections at a range of energies, so the reaction rates can be calclated. The only neutron cross section data files I have found have just the overall cross sections. Are there any files available that give the...
  50. H

    Nonparametric ANOVA w/ Between-Subjects Variable: Advice Appreciated

    I'm currently looking to use a nonparametric alternative to the parametric repeated-measures with a between-subjects variable. I'm aiming to investigate three sets of subscores of a test taken by three groups of participants. I was initially using the parametric repeated-measures ANOVA using the...
Back
Top