Acids Definition and 194 Threads

In my chemistry notes it gives the equations, ##R-COOH + PCl_5 \rightleftharpoons R-COCl + POCl_3 + HCl## ##R-COOH + SOCl_2 \rightleftharpoons R-COCl + SO_2 + HCl## It then says that in an open system the reaction with thionyl chloride will go to completion as all the products except...

Homework Statement what is the H, Oh , ph and poh for a 0.048 mol/l solution of benzoic acid? C6H5COOH Homework Equations Ph +poh=14 Ph=-log(h30+) H30=10^-ph The Attempt at a Solution I thought maybe u need to separate benzoic acid into its ions and then use the molar ratio to...

Homework Statement What is the H3O+ concentration of a 0.100 M acetic acid solution (Ka = 1.8 x 10-5)? a. 1.8 x 10-5 b. 1.8 x 10-4 c. 1.3 x 10-2 d. 1.3 x 10-3 e. 0.9 x 10-3 Homework Equations The Attempt at a Solution so the question is supposed to be D. but I thought that...

Homework Statement If a weak acid, HA, is 3% dissociated in a 0.25 M solution, calculate the Ka and the pH of the solution. Homework Equations pH = (pKa - log[HA])/2 The Attempt at a Solution Honestly, I'm not even sure where to start. I don't have the pH or the pKa - how am I...

Title says it all. I don`t get it.

Homework Statement I understand that pH is a measure of the concentration of hydrogen ions in a solution. A more concentrated acid would have more hydrogen ions in a given volume of solution? Wouldn't that mean that it should have a much lower pH? Why then do we have the pH of dilute...

Hi forum goersI'm reviewing some coursework for my General Chemistry class and cannot seem to find a reasonable explanation of why amino acids exist as zwitterons in solid state and ph7 solutions. I'm fairly certain the explanation has to do with its solubility in water, but I am not sure. Here...

Lets say a certain chemical reacts with an acid. Does that make that chemical a base always and vice versa? Like in S + NaOH → Na2S + Na2S2O3, Sulfur reacting with a base would it make S an acid? Or do we call it a base or an acid, reacting with the opposite if it's producing water as a...

Hi everybody, Please forgive my question which is probably very obvious, but why are acids based on H ion concentration? Why is HCl a strong acid whereas LiCl is a salt. Both H and Li form + ions in solution. Conversely, why are OH- bases? Why can't NaCl be a strong base? I'm sure the...

Hello! I'm having a hard time understanding the acidity and basicity of amino acids. I read this: the acidic group in an amino acid is NOT the -COOH but the NH3+ and the basic group is COO- and not the NH2... why? Thanks in advance!

Homework Statement Oxalic acid, H2C2O4, which is found in certain pants, can provide two hydronium ions in water. Write balanced equations to show how oxalic acid can supply one and then a second H3O+ ion. Homework Equations There's not really an equation, and if there is please don't make...

Homework Statement Both (E)- and (Z)-2-chlorobutenedioic acids dehyrochlorinate to give acetylene dicarboxylic acid. This reaction proceeds through the addition of a base and an E2 elimination. The (Z) acid reacts about 50 times faster than the (E) acid. Explain why. 2. The attempt at a...

okay well basically this is what i know or think i know: i have the pKa's of the carboxyl, amino, and R group of the amino acid and the pH of the solution it is in. I'm supposed to figure out the net charge for it at different pHs. i taught myself one way to do it (by looking **** up) and i...

I am doing a lab this week where the objective is to use acids and bases and a microscale extraction to separate three solids in a mixture. The mixture in question is a mixture of naphthalene, benzoic acid, and ethyl 4-aminobenzoate. It will then be put through a series of solvents and...

Determine the equilibrium pH of aqueous solutions for the following strong acids or bases: (a) 257mg/L of HSO4- ; (b) 10nM NaOH ; (c) 75ug/L of HNO3

Homework Statement Hi. I'm pretty much a beginner in organic chemistry and I'm just wondering something. For example, I know that HCl is a stronger acid than HF. But... then why the following happens if a have an organic acid (e.g a carboxylic acid)? According to what I see, a...

Homework Statement Data for Question B: (initial)[CH3COOH] = 0.500 mol dm–3 and) eqm [CH3COOH] = 0.200 mol dm–3; (initial)[CH3COO–] = 0.300 mol dm–3 and) eqm [CH3COO–] = 0.300 mol dm–3; The Attempt at a Solution Question A) " FInd the pH of a mixture of 50.0 cm3 of 0.100 mol...

I've been given a question on how to tell whether a compound is an acid or base or neautral in an aquesous solution. Na2CO3 Please help.

I'm doing a lab and my biology teacher specifically told me to count the amino acids found in the hemoglobin of the aforementioned animals. Since I'm sure I'm not the only one who'd rather not count, and I cannot for the life of me find the numbers on the Internet, I figured I would post what...

Homework Statement How does the following reaction demonstrate an amino acid as an acid: H2NCH2COOH + CH3OH → H2NCH2COOCH3 + H2O How does the following reaction demonstrate an amino acid as a base: H2NCH2COOH + CH3COCl → CH3CONHCH2COOH + HCl Homework Equations The Attempt at a...

Homework Statement I have to design a lab which will determine nitric, hydrochloric and sulfuric acid from containers A, B and C - i.e. It is unknown which acid is held in which container. This has to be done by reacting the unknown acids with magnesium Homework Equations Mg + 2H(+) →...

I can quickly calculate the dissociation degree of a monoprotic acid with the formula below (derived from the Hendersson-Hasselbach equation). I don't see any reason why this would not work also for polyprotic acids but I would like to confirm that it does. I would appreciate it if someone could...

Metals will react with acid to form a salt and water. But won't the metal also react with water to form an hydroxide? Similarly, when I put sodium metal into a zinc sulfate solution will displacement occur or will the sodium react with water? Thanks for the help!

Why there is no mesomeric interaction between \pi-electrons of aromatic ring and \pi-electrons of carbonyl group in benzoic acids?

hi, I've got a problem,which 3 amino acids are non-chiral ? I know there are many of them but I suppose they're only asking about those which are in organisms... I know about glycine but what are the other two ? thanks

1. I need to detect amino acids and nucleotide bases that MAY be present in small quantities on Titan in the Hydrocarbon seas Homework Equations Not required this is for a mission analysis class The Attempt at a Solution So I'm working on a project for my fourth year class in...

So I'm working on a project for my fourth year class in Space Mission Design and Analysis (I'm a fourth year space systems engineering student). My project is an astrobiology mission to Titan, Saturn's sixth moon, which is only slightly smaller than Mars with a atmosphere of Nitrogen of...

Heres meta methoxy benzoic acid: and here's para methoxy benzoic acid: m-methoxybenzoic acid is a stronger acid than its para substituted analogue. I'm a bit confused about why this is. From what I've read, its because at the meta position, only the methoxy groups inductive withdrawing effects...

Dear Fellow Members, I am presently trying to write a Fortran 95 program to separate acids from a list of chemicals in a text file and then write them to a second text file. The program first matches the word "acid" and is then supposed to check if the word preceding the word...

At what temperatures do alpha-linoleic acid, DHA and EPA oxidize? I've tried using Google scholar to find such info and think its time to ask specialists.

I tried googling this topic and basically all I could find was sites saying they neutralise each other - I know that. But why is it that when you mix say a drop of pH 14 solution with a lot of pH 1 solution that they react rather violently and the acid sprays everywhere? If someone could maybe...

Homework Statement I'm having problems understanding amphoteric acids and bases. I know amphoteric means that it can act as an acid or base, but when the question asks me to write the equation to support this statement, I always get it wrong :confused: Homework Equations HSO4^-1 is an...

What about Bronsted acids? And what about Lewis bases that don't have pH's over 7? (same for Bronsted bases)

Can someone help me understand this statement: The pKa of most fatty acids is around 4.5, so most fatty acids exist in their anion form in the cellular environment. I know what a pKa is... it is -log(Ka), where Ka is the equilibrium constant of the reaction. In this case the Ka would be...

My book says the following: NH4NO3 is weakly acidic as a salt because it is composed of the conjugates of the base NH3 and the strong acid HNO3. Why does that make it weakly acidic exactly?? Is it because the HNO3 is a strong acid, therefore it won't steal the protons that are...

i'm trying to dissolve an unknown acid salt and it is not soluble in water at stp. it does dissolve, however, when it undergoes heat and some stirring. is this property representative of most weak acids, that they are not easily miscible in water?

hi all! I am not able to understand what's a Lewis acid and a Lewis base. tell me if these are Lewis acids or Lewis bases and tell me the reason. HCl, H2SO4, H3PO4, CO2, HCN. my approach: first 3 I'm not able to decide. 4th one I thought to be Lewis base as 2lone pairs of electrons left in...

Sorry guys, I can't seem to grasp the concept: It deals with acids and bases. When the acid donates the proton, to the base, how do we know how many is transferred and how many the base can accept? This is where I am stumped. Homework Statement What ions are formed when nitric...

We all know an amino acid consists of a carbon atom with an amine group, a carboxylic acid group, and a hydrogen atom. Also attached to this carbon is an 'R' group, which varies from amino acid to amino acid. My question regards the 'R' group. If the R group can be anything from a hydrogen...

So, it's for Mastering Chemistry and I need to sort out the strong acids weak acids strong bases and weak bases. It says that two are wrong though I've looked them all up and don't know which ones are wrong. [PLAIN]http://bit.ly/fREfFS

Homework Statement 0.5332 M CH3COOH 0.1219 M CH3COONa 0.100 M H2S 0.41452 M NaOH what is the pH of the resulting solution? Homework Equations CH3COOH Ka=1.75E-5 H2S Ka1=9.6E-8, Ka2=1.3e-14 The Attempt at a Solution I know that neutralisation will occur, but there is not...

Homework Statement what is the product A?? http://img266.imageshack.us/i/43982323.png/ Homework Equations The Attempt at a Solution i can only think of decarboxylation , which is wrong?? wat else can happen??

Can anyone explain to me how to determine whether a compound is a strong acid, weak acid, strong base, weak base, or amphoteric? Thanks!

The strength of an acid is determined by the amount of it per volume ionizes right? So is it safe to say acids, when not in water, are composed of ions? So for example, HCL has the potential to be an acid,as it is made of a H ion and a CL ion, but cannot be until it reacts with water, because...

The concept I have not been able to grasp, is WHY an acid has to have a positive hydrogen ion, and a base has to have a negative hydroxide ion. From what I understand, when an acid is placed in an aqueous solution is the following: H30 and Cl react to turn into H30+ and Cl-, but what I don't...

This is a subject I am unfamiliar with, and was just wondering where I should start in order to learn about them and how they affect different elements and form other substances step-by-step. From what I know, an Acid donated a Hydrogen Ion, and a Base takes a Hydrogen Ion, and an Acid has to...

Homework Statement When forming a micelle, molecules such as fatty acids, detergents and lysophospholids form micelles on the basis that the cross sectional area of the head group (I'm guessing the polar part that interacts with water) must be greater than the acyl side chain...but what...

can oxy acids make acid salts?

Homework Statement I'm a little confused, let's say i do a titration curve for a weak acid, at some point there's a buffering range near the pKa. Like i know that if we add a strong base like NaOH to acetic acid in a water solvent, then the OH- will combine with the H+ (hydronium ion) which...

how to calculate the pH of a mixed solution containg 0.200M HA and 0.2 HB ka of HA =1.0^10-5 KA OF HB = 1.0^-6