Base Definition and 571 Threads

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

Please justify this phenomenon: In an active mode for a transistor, ideally it is assumed that collector current is independent of the base collector reverse bias, whereas, the collector is slightly dependent on the base collector voltage. Thanks ~Eternallove

if we treat acetaldehyde with dilute base which out of the following two will be the major product: a}acetic acid b}alpha hydroxy butanal Ofcourse anyone would think of an aldol product which would be [B]beta hydroxy butanal[/B],but that is not given here,isn't there a slight chance that...

In DNA, the two purines are Adenine and Guanine and the two pyrimidines are Thymine and Cytosine. NOw...in DNA...Adenine pairs with Thymine and Guanine pairs with Cytosine. A purine pairs with a pyrimidine. That explains why Adenine cannot pair with Guanine and why Thymine cannot pair with...

When I look at a map which shows the sea floors I see canons at the base of large rivers which tend to fork out and travel long across the ocean floor. It looks very much like they were carved by the river. What are these and what caused them?

Base 10 Anomaly An applied 49-year study into the origin of pi and the Base 10 number system resulted in the finding of a highly anomalous formula. Essentially, the finding derives from the perfect ratios (0:1:1:2:3:4) given by Pythagoras who we know studied and perhaps taught in the...

Hi. Part of my homework was to work out what the SI base units of the gravitaional constant are. I'm crap at working out base units so could somebody help me out? Thanks If anyones wondering, G is 6.67 x 10ˉ¹¹ N m² kgˉ²

I've never really used Mathematica before so I'm rather confused by it, how would I say convert a number, 23a94b13 to base 10?

The base of a certain solid is the triangle with vertices at (-8,4) ,(4,4), and the origin. Cross-sections perpendicular to the y-axis are squares. Then the volume of the solid is __________ i have no clue or don't even know how to start this problem. Well the first thing i did was just...

Hi, I've a riddle that I can't solve. I hope someone can help me in it. Here is it: If we have a number and add the digits of that number, then subtract the summation we got from the original number, why is the result always multiples of the base system minus 1. Here is an example...

Hi, I just began working on a little program to convert base 10 number to Roman numerals. I couldn't figure out how to make a loop to count how many Ms, Ds, Cs etc. so I wrote it out the long way for now. I can see a lot a repetition and an obvious pattern in my divisors, since I am dividing...

Hiya, Im trying to determine the initial molarity of an unknown acid, sooo I am trying to titrate it with standardized sodium hydroxide solution (0.1M). But I am having a load of problems figuring out what the heck I am supposed to do since i am told the acid is a weak acid. If I am...

Hi all, I don't know how to solve this: The vector u has the coordinates ( u_1, u_2, u_3 ) to the base a = { ( 1,0,0), (1,1,0), (1,1,1) } and it has the coordinates ( u^{'}_{1}, u^{'}_{2}, u^{'}_{3} ) to the base b. We also know: u_1 = 2u^{'}_1 - u^{'}_2 + u^{'}_3 u_2 = u^{'}_1...

pH help?? This is the question i need help in: A 0.200 M solution of a weak base in water has a pH=10.40. Calculate the value of kb for this base. I know the answer but i need help on how to get that answer. Thanks

I don't have the answers in the back of my book and I really want to know if i did this correctly since its graded. the Problem is: Let the region bounded by x^2+y^2=9 be the base of a solid. Find the Volume if cross sections taken perpendicular to the base are isosceles right triangles. i...