Acids Definition and 187 Threads

Can someone explain to me why at room temperature acids cannot dissolve diamond? Is it related to its hardness?

[Mentor Note: Two thread starts merged into one] I need to remove the Aluminium heat fins from a CPU heat extange lined around some copper water heat pipes. I could use a saw, cnc or grinder to remove them, but it seems that this way could be cleaner, and less probable to ruin the heat pipes...

Hi everyone! Do you know why fatty acids burn in the presence of carbon? I found some explanations on the internet but they didn't help me. Can you explain me (in simple terms) why fatty acids burn in the presence of carbon ?

The pH stays the same because the optimum pH of trypsin is around pH 7.5. I think??

Hello , in the course of fatty acids synthesis the professor said that after the repetition of the cycle 7 times we end up with a 16 carbon chain and he added that all the carbons came from acetyl-COA except for one . i didn't understand the last one , what is the carbon that don't come from...

Hello , is minor bases and Nucleoside the same thing ?

I have an ash which is a mix of oxides (Cr2O3, CuO, ZnO, PbO, CdO, NiO, SiO2, MgO, CaO). I am adding phosphoric acid. But as a weak acid, will it react with oxides? If so, are these conversions 100% or more of a equillibrium (partial conversion). I you need more information, be sure to ask.

Hello , I am studying lipids and a point got me confused . it is said that beside the fatty acid we have glycerol and sphingosine that forms the backbone of the lipid . is the lipid formed by those 3 components at the same time (fatty acid +glycerol +sphingosine ) or it is formed by the fatty...

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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...

I can't figure out why hydrogen is more likely to bond to either the nitrogen or to the sulphur atom. I can't locate any information in any textbooks or online as to which molecule is more prevalent/common. This is not a homework question. I just came across one of these molecules and wondered...

This question says: An HA weak acid solution with a molarity of 0.1M is dissolved in water. In the new solution, is the molarity of OH- greater than the H3O+ molarity, or the opposite? Or are they equal? I came up with two possible answers: 1. [H3O+]>[OH-] because there are no hydroxides...

The question says: A solution of highly acidic HA is given, with a molarity of 1M. Is it true that [A-]>[H3O+] or not? I simply don't understand why the hydronium is mentioned and i don't know how to find the molarity of these two individually.

Hello, we are studying potato periderm before/after digestion and dewaxing and native vs wounded. One of the techniques is XRD, hence my user name. Among other things we are trying to use XRD to determine the arrangement of fatty acids, esters, and other long-chain aliphatics that are present...

Does anyone know of a self-assembling monolayer that can bind to triethylamine,deposit onto graphene/TMD by evaporation, and that has "low toxicity" (that I could use in the lab)? P-dopants could only help dope one side of the material and TEA would react on the other but that is very hard to...

Hi I am new to the concept of neutralization. My teacher told me that acids do not react with neutral salts. I want to know why not. If both are dissolved in water and both completely dissociate, why can't the ions of acid and salt exchange and perform a double displacement reaction. Moreover I...

Hello, Are the 20 amino acids that are usually referenced when building genetically coded proteins in all of life, and no other amino acids or are these only in humans and animals? I found the sentence below on this website and I wasn't sure what to make of it, is it true that there are...

Ok so i am a beginner in organic chemistry and i came across comparing acidity. Now according to various books i referred,anthranilic acid/ortho-amino benzoic acid is less acidic than benzoic acid.There was not sufficient explanation and therefore,my doubt. According to my book,in o-hydroxy...

Homework Statement Suppose you were told you had a protein with molecular mass of 65,000 g/mol. Show how you would estimate the number of amino acids present in this protein. Keep in mind that you cannot calculate the exact number, the point of this is to approximate how many amino acids are...

It is said that of the 20 amino acids that body needs to produce it's proteins, 9 are not made by the body, so they need to be given in the form food. My question is, is the said nine are not all produced by the body, or are the body produces them, albeit very little which is not enough?

I've been researching several nutritional questions after changing to a plant-based diet and while I've been able to more or less nail down much of my uncertainty, there are a few things that I haven't been able to easily find out. One of these is the matter of Omega-3 fatty acids (FA) in the...

I know that a "strong acid" is one that ionizes completely in water. For example, hydrochloric acid, sulfuric acid, nitric acid, etc are considered strong acids because they all completely neutralize. Now, this leads me to two questions: 1) Is the concentration of a strong acid irrelevant in...

After having a debate with somebody about amino acids found in space, they replied, " As for the amino acids, we simply have no evidence that they can actually form in space -- it is indeed quite a ridiculous assertion. I am reminded of a PhD named Hugh Ross who actually talked about something...

In any simple carboxylic acid there are two oxygen atoms then i have a confusion that which oxygen has more negative charge on it or which one has the most electron density on it?

Homework Statement What is the total number of isomeric carboxylic acids and esters having the molecular formula C4H8O2? A.6 B.5 C.4 D.3 E.2 Homework EquationsThe Attempt at a Solution My answer was 4. The isomers I got was: -2-methyl propanoic acid -butanoic acid -methyl...

so is an acid like HCl, is it basically these HCl ions that are "dissolved" or "infused" into water and form an acid? So what I'm saying is HCl by itself isn't possible and it's only possible in the dissolved form or aqueas form. This would make sense because as far as I know an acid or base...

Hello! I have read (I don't remember the source, and have it only in my notes now) that oxo acids can be strong if Y element has a high electronegativity. If generic formula for oxo acids is HnYOm, than if Y has high electronegativity, it will cause the acid to become strong because Y will be...

In nature, do right and left handed amino acids act like magnets in that right and left bind more readily than left + left or right + right? Do amino acids bind with each other, creating functional proteins without the help of other molecules/catalysts? At what temperatures/pressures does...

How do I know which species is a Lewis acid and which is a Lewis base?

Since Acetic Acid is a weak acid, it has a low Ka which means that the forward reaction is not favored as much as the reverse reaction. However, the Kb is even lower than the Ka...how is this possible? Shouldn't the Kb be higher to indicate that the reverse reaction is favored?

Homework Statement Which of the following would you not do in a laboratory setting? I. Pour acids and bases over a sink II. Wear goggles III. Heat a stoppered test tube (A) I only (B) II only (C) III only (D) I and III only (E) I, II, and III Homework Equations - The Attempt at a...

Just wondering what the physical size of amino acids such as glycine and alanine are in nm or Angstroms. Thanks.

Homework Statement The pKa of acetylsalicylic acid (aspirin) is 3.5. The pH of gastric juice in the stomach is about 2-3 and the pH in the small intestine is about 8. Aspirin will be Answer is ionised in the small intestine and almost unionised in the stomach. Homework EquationsThe Attempt at...

Hey all! I have a silly doubt In acids and bases As you guys know The concentration of H+ ions For a weak acid Which does not undergo Complete dissociation Is given by mod H+=square root of Ka times C Where C is the initial concentration Of the acid And k is the ionization constant In the same...

Hi All the chemical compounds can be categorized as acids, bases, and neutral compounds. There are different theories, namely Arrhenius Theory, Brønsted-Lowry Theory, Lewis Theory, which define the acids and bases. Each successive theory becoming more general; Lewis Theory is the most...

Hi! I just read in an inorganic chemistry book (by Whitten, et al.) that acids are defined as substances that produce H+ ions in dilute aqueous solutions, and bases are those that produce OH-. To me, this definition implies that a substance that has yet to produce an H+ or an OH- can already be...

Homework Statement Hi everyone. I'm a relatively new high school chemistry teacher. I'm teaching modified arrhenius theory to my students, and I'm unclear on ionization vs. dissociation. Homework EquationsThe Attempt at a Solution Here is my understanding: - Dissociation occurs when an ionic...

I've written the following brief history on how the definition of acids and bases change over time. Lavoisier came up with his definition circa 1776 in that 'p is acidic iff p contains much oxygen' and that held sway for 30 years[1] until it was falsified by Davy in 1810[2] who demonstrated...

Mg(s) + 2HCl (aq) --> H2(g) + MgCl2(aq) + heatMg (s) + H2SO4(aq) --> H2 (g) + MgSO4 (aq) + heatMg(s) + 2C2H4O2(aq) --> H2 (g) + Mg(C2H3O2)2 (aq) + heat Which reaction will produce the great molar enthalpy and which the least? Why?

I have been trying to get my head around the basics for these four (Carbohydrates, Proteins, Amino Acids and Lipids) for about a week and I just don't understand the basic structure, formulas and such. Help?!

Homework Statement You have 725 mL of an 0.55 acetic acid solution. What volume (V) of 1.30 M NaOH solution must you add in order to prepare an acetate buffer of pH = 4.99? ( The pKa of acetic acid is 4.76.) [/B] Homework Equations pH = pKa + log A/HA Ratio of A- to HA = 10^(pH-pKA)[/B]The...

I was reading this website (http://www.chembuddy.com/?left=pH-calculation&right=pH-amphiprotic-salt) on calculating pH of amphiprotic salts. My question is why can't you do something similar for diprotic acids? Take for example the diprotic acid H2S. Because you have the following...

Does the polarity of the binary halogen acids increase or decrease down the group? I have one argument for decrease based solely on electronegativity considerations. I have one argument for increase based on orbital overlap and electron density. Taking electron density in an orbital to be...

Please look at pictures. I am wondering for (d). Why is the answer the second one? To which structure in Table 3.1 should I compare it to? I compare the first one to CH3CO2-. What about the second one?

I read about a study that nitro fatty acids reduced blood pressure in mice and perhaps in humans. What is nitro fatty acids? Is it free radicals or antioxidants? http://www.sciencedaily.com/releases/2014/05/140519160712.htm

HCl(l) + H2O → H+(aq) + Cl-(aq) or is it HCl(g)+ H2O → H+(aq) + Cl-(aq) If HCL is liquid is it dil. or conc. ??

I'm confused about the dissolution of strong acids (like HCl) in water. We're told that they dissolve completely because They are strong electrolytes. The hydrogen atom that is lost during dissociation is *not* strongly bound to the rest of the acid molecule. Therefore, the solvent...

Hi, I was reviewing some of my notes and was wondering what the correct steps for this would be (assuming in aqueous solution). If you have ## H_2CO_3 ⇔ H^+ + HCO_3^- ## finding the final concentration of HCO3- is simple enough. Now, for ## HCO_3^- ⇔ H^+ + CO_3^{2-} ## this would change the...

I have an amino carboxylic acid that is practically insoluble in most alcohols and in water, but supposedly soluble in an 20% NaOH solution. A basic reaction is run with an organic solvent/reactant, and the amino carboxylic acid dissolved in the NaOH solution. After the reaction the layers...

Homework Statement Indicator HIN is yellow at pH 1.0 or less, green at pH 2.0, and blue at pH 3.0 or above. A 0.004 M sample of colorless acid HA is treated. It develops a green-blue color halfway between pure green and pure blue. How do the strengths of HA and HIN compare? Homework...