Base Definition and 586 Threads

Homework Statement Given H2SO4 + 2LiOH --> Li2SO4 + 2H2O, how many mL of a 0.700-M solution of KOH are needed to react with 235 mL of a 0.350-M H2SO4 solution? The Attempt at a Solution Really, I have none. My problem is that I don't understand what the question is asking. I could...

Homework Statement I know this is a biology question but this is the most busy forum so I decided to put it here: I'll make this simple. A restriction enzyme reads a DNA strand containing nucleotide base pairs. It cuts the strand after it reads a sequence of 6 base pairs - AAGCCT. Of...

Question: TRIS is a weak base. Compute pH of a solution containing .050 moles of TRIS and .020 moles of HCl in a total volume of 2L. pKb for TRIS is 5.92. Use RNH2 to represent TRIS. Equation: pH = pKa+ log ([conjugate base]/[acid]) Work: change equation for pOH: pH = 14-pOH pOH =...

Homework Statement I'm making a table on excel with the calculated pH of the solution vs the actual measured pH from the lab. My problem is finding the pH of a acetic acid-acetate buffer that has been titrated with HCl, once the moles of HCl are greater than the initial quantity of mols of...

Homework Statement Sketch curve of pH vs volume of base added for the titration of 50.0ml of 1.00M acetic acid with 1.00M sodium hydroxide. Homework Equations none, i think. The Attempt at a Solution Okay, first off, this is a weak acid, the first point on the curve would be the initial...

Homework Statement You dissolve an unknown quantity of weak acid HA into 50 mL of water. It only takes 1 mL of 5 M NaOH to completely neutralize the acid. The Ka of the acid is 3.2 x10^-4. What is the pH at the endpoint?Homework Equations Ka * Kb = Kw pH + pOH = 14 p(of whatever) = -log(of...

Sulphate ions and nitric acid wouldn’t react? Is it because sulfuric acid is a very strong acid, while nitric acids are very weak. So the conjugate base of sulfuric acid which is sulphate ions is very weak and too weak to accept the proton from a weak acid like nitric acid. When you have a weak...

Time-oriented geometrized units→Second and its derivates in terms of 7 SI base units I expressed second in terms of meter and kilogram. For doing this I used: For expressing second in meters: 1s¹ = c = 299792458 m For expressing second in kilograms: 1s¹ = c³/G =...

Homework Statement The problem is quite easy, but I've still trouble solving this. Given the two base vectors e1=(1,-2,0) and e2=(0,3,0) and the other ones of a different vector space w1=(1,0,0) and w2=(0,1,0). I've to find a matrix A that that does the following Ae1=w1 and Ae2=w2...

Homework Statement A vessel contains 500mL of .1 molar H2S solution. For H2S Ka1 = 1 x 10^-7 Ka2 = 1.3 x 10^-13. What will the pH be when 800mL of .1molar NaOH has been added. Homework Equations ph = -log([H]) ph = pka + log(B/A)The Attempt at a Solution This is how I started, I found the...

p-Hydroxybenzoic acid, HOC6H4COOH, is a weak diprotic acid. A 25.00 mL aliquot of a dilute solution of HOC6H4COOH is titrated with a 0.0200 M NaOH solution. The first equivalence point was reached after 16.24 mL of the NaOH solution was added. a. If the values of the pH after 8.12 and 16.24 mL...

Hello everyone. This is for a descrete math class, and he said you must know the change of base formula, so if you have everything in log base 3, you can figure out what it is in log base 2 as an example. But I'm looking up the examples on the interenet and they all seem to convert whatever...

I have a conjugated acid + excess base (OH-) ---><---... I don't know how to write the part on the right. Help.. Thanks.

This method utilizes discrete binary operations, in particular notice that. (I1) Div(x+y+z,a)=Div(x,a)+Div(y,a)+Div(z,a)+\{0,1,2\} This means that for one of the elements of the included set {0,1,2} the equation is true. This notation is quite useful for carrying out long calculations...

Formula for "Heavy Paraffinic Base Oil"? Is there a chemical formula for "Heavy Paraffinic Base Oil"? (like the base oil in motor oil) Or is it made up of other compounds and that's why I can't find a formula for it.? If so than I need to give a full description of the chemical with a formula...

There's a new paper in Science that investigates the effect of a single SNP (single nucleotide polymorphism) on memory usage effectiveness. People with the Thymine base in a certain locus do markedly better in task involving short-term memory than those with the Cystine base at that location...

I tried looking for this online, but didn't really find anything can someone help me out I need an example of a naturally- occurring acid-base buffering system in an organism

I was doing a test and the there is a picture with the box at the bottom of the water.First they ask me to find the weight.I found it.Then later they ask me to calculate the buoyant force.My teacher said that there is no buoyant force at the bottom.But the Archimedes Principle states that the...

1)Which of the following is not both a Bronsted-Lowry acid and a Bronsted-Lowry base? a. OH- b. HSO4- c. SH- d. HCO3- e. H2PO4- I knwo its not HCO3, H2PO4- AND HSO4-, but i cannot figure out whether OH can act as an acid and base or not, i know its produced when a base react...

I have a question concering acid base reactions. All strong acid-strong base reactions produce a water soluble salt and water with the exception of what? I need to know that along with the formula unit, total ionic and net ionic equation. Please any help would be appreciated. Thank you

How do I do a ternary expansion of numbers, and prove that if a number is part of the 2^k iteration of the cantor set if and only if each decimal expansion position is either a two or zero? If you guys can give me a hint, I would love to go from there.

I thought that the base recombination current (say in a pnp bjt) was the current caused by the electrons that come up the base wire to compensate the loss of free electrons from the recombination process in the base. But recently I read that this are actually two different currents that sum up...

How can I do functions in different bases, other than 10? Like for example, f(x) where x is in base 7. I'd also like to know how to input such functions into mathematica For example let's say, f(x) = log x but x must be only in base 7. Thanks,

NaOH and other hydroxide bases are ionic or molecular substances? In water, they will dissociate into a cation and one or more hydroxide ions or ionize, forming those ions?

Which acid of the following set has the strongest conjugate base? a. CH4 b. NH3 c. H2O d. HF Is this correct? Any help is appreciated

1) In an experiment to determine the molecular weight and the ionization constant for ascorbic acid (vitamin C), a student dissolved 1.3717 grams of the acid in water to make 50.00 milliliters of solution. The entire solution was titrated with a 0.2211-molar NaOH solution. The pH was monitored...

I know that with base e you use the natural log of complex numbers rule... ln(x+yi) = ln|x| + arcsin(y/x)i ...because the limit e somehow corresponds to radians about the unit circle thus, when you take ln(-1) you can do ln(-1 + 0i) = ln|-1| = arsin(0/-1)i ln(-1) = 0 + pi*i ln(-1) = pi*i My...

Hi. I am having trouble with acid-base titration excercises. 0.02 L butanoic acid @ 0.1 M is titrated with 0.01 L NaOH solution @ 0.1 M. The Ka of butanoic acid is 1.54X10^-5. Find the pH. The answer is 4.81. I know how to find the pH when no NaOH is added, but I really don't see how the...

Hi, I am just a little confused with this log law of change base. Is there anyone who can give me a clear description with an example?:smile: Thanks

can someone help me think of an application of why a persion would need to test for acid and base?

I am trying to come up with an equation to determine the azimuth and incline a turret must be at to hit a stationary target of known distance and elevation when you know the initial velocity and mass of the projectile and the velocity of the base holding the turret. I am trying to program a...

How do you do this problem (without a calculator) that looks deceivingly simple, yet is utterly confusing. (2 ^ 30 - 2 ^ 29)/2 = ?. The answer is 2 ^ 28, but how was this done without using a calculator. The furthest I can take this without using a calculator is 2 ^ 29 - 2 ^ 28

How many moles of H3O+ must be added to one liter of a solution to adjust the pH from 7.17 to 5.85? Correct answer 1.34E-6 (1.34 * 10-6) The correct answer is given, however I would like to know how to do this problem.

what is the product of the reaction: PbO + NaOH -> ? or PbO + NaOH + H2O -> ?? is there any difference?:frown: thanks

This is the question: http://www.maths.tcd.ie/~cockburd/Question.jpg It's not a homework question, merely one from a previous years tutorial sheet. Okay so it's tetragonal conventional unit cell, has a sort of face centered structure right? Em.. so that would mean it has a four point basis...

log_2(x) + log_4(x) = 2 I've tried everything i can think of, including changing the base - to no avail. Any ideas?!

Hi, My question asks to: List the methods that use the complementary base pairing properties of DNA (hint; any methods that use DNA-DNA or DNA-RNA hybridization); include those that we covered in Recombinant DNA Technology and Genomics. You can include a few extra ones from the book...

I don't know how to solve x for things like e^x=20. The problem I have to solve is x^3+e^(2x)+8=0 Can anyone help, please?

Hi i need a variable speed motor. I came across a catalog which has a motor with a base speed of 1800rpm and power of 1hp and it is of a variable torque type. What does base speed means here? Does it means it allows speed from 0 to 1800rpm? and does its power of 1hp is constant for...

i need help with this problem The base of the pyramid is 100 blocks by 100 blocks; each successive layer is one less block wide and deep, until the top layer which is simply one block. Each block is 97 cm wide by 97 cm deep by 63 cm tall. If one liter of paint can coat exactly three square...

Ok, I am currently taking a course where you have to draw state diagrams to represent functions in different bases. the function is 2x_{1}+x_{2}. When you add two numbers regardless of the base you have a sum (least significant digit) and a carry. Now in base one, is it possible to have a carry...

can you imagine a system of base units* in which time was not included? *the system of base units is the following: quantity----------------------------name-----------symbol time--------------------------------second----------s length------------------------------meter------------m...

I was curious if anyone knew why some FETs have base diodes. The only purpose I can imagine is wanting current to flow in a direction when the FET is off because when the diode is on current flows through the channel bypassing the diode and when the FET is off there is no current flow at all so...

I know how to convert from any base to any other base but to do so I usually have to go through base 10 with the exception of base 2 to base 16 and vise-versa. I was wondering if you guys know an easy way to convert bases? The way I usually do it is using the base notation to get base 10 then...

Why is it better to use phenolphthalein than bromothymol blue to determine the equivalence point which is equal to 7? bromothymol blue: 6.0 - 7.6 yellow @ blue phenolphthalein: 8.3 - 10.0 colorless @ pink

About 20 years ago I caught an article about a graduate student who had found an algoritm which would return the n-th digit of \pi without needing to compute the preceding digits. In other words you could ask for the 812th digit of \pi and it would spit it out without computing the...

I'm trying to show my students that CaCO_3 is basic. Ca^2^+ comes from Ca(OH)_2, which is a weak base due to it's low solubility. CO_3^2^- comes from the weak acid HCO_3^-. To compare the two we compare: 1) Ca^2^+ + H_2O --> Ca(OH)_2 + H_3O^+ and 2) CO_3^2^- + H_2O --> HCO_3^- +...

I'm stumped by this problem: let W be the subspace of C[0,1] spanned by S={sin^2(x),cos^2(x),cos2x} a) explain why S is not a basis for W it's because S not linearly independent b) find a basis for W please help me with this one... TIA.

The question goes like this: "The base of a certain solid is circular with a radius of 1. Cross-sections of the solid, perpendicular to the base, are square. Find the volume of the solid." In visualizing this object, i see that it looks like a "blocky" foot ball, where the perimeter is...

Does anyone know where to find a base to base conversion calculator that can do basic math in other number bases. Finding one that will select between bases 2; 8; 10; 16 isn’t hard. But how about base 3; 4; 6; and 12 Seen any web based tools, or a spread sheet add in that can do this? RB