Acid Definition and 698 Threads

for example, ethanoic acid in water, "="means equilibrium arrows CH3COOH(aq) + H2O(l) = CH3COO-(aq) + H3O(aq) we take the pH as the -log of the concentration of H3O ions. BUT why do we not take in account the effect of the ethanoate ion with water which produces OH-? CH3COO-(aq) +...

In our chemistry class, we learned that an acid is a molecular compound that release hydrogen ions when they are dissolved in water through a process called ionization. So are both Hydrogen Sulfide (g) and Hydrosulfuric Acid (aq) acids?

Case:1 I have one iron spring. I compress it gives potential energy E= ½* K*x2 & bind it by glass wire which is not melted in acid. Now I put this spring in acid & it melted completely, So where the potential energy gone? Case:2 I put one magnet in glass vessel & hold it in vessel by some...

Homework Statement Is H3CC(=O)CH2CH3 more likely to act as a Lewis Acid or Lewis Base? Explain your choice. Same for HCO2H (formic acid)Homework Equations N/AThe Attempt at a Solution Since a Lewis Base donates electron pairs, and the oxygen in H3CC(=O)CH2CH3 has two lone pairs, I reasoned...

Acid dissociates in water to form H3O+ and OH- but the formal charge on the oxygen atom in H3O+ is +1. Shouldn't the oxygen atom have a negative formal charge since it is more electronegative than hydrogen atom?

http://img19.imageshack.us/img19/2692/chptitration.jpg http://img130.imageshack.us/img130/6351/titrationfigure1.jpg 1.)For the titration of strong acid and strong base, and at the beginning of the curve, how to explain the big amount of base added only increase a little of the pH value...

I recently did an experiment with the following reaction: NH_4^+ + OH^-<-->NH_3+H_2O I added phenolphthlein, which is magenta in the presence of base. Now, I have to explain, after adding certain chemicals why I have certain color. The one color change I am having trouble explaining...

Homework Statement NaOH(aq) + HCl(aq) ------> NaCl(aq) + H2O(l) 50mL of 1.0M HCl and 50ml 1.0M NaOH was mixed. Total heat is 2826J. If the density of 0.5M NaCl produced in this reaction is 1.02g/mL: a) What is the mass of the solution? b) Moles of water formed c) Moles of NaCl formed d) Molar...

Would you expect to that Aspirin and Ibprofen are more or less soluble in water than benzoic acid? ( I believe it has something to do with the polarity of the bonds but I am unsure how to choose between the two.)

Homework Statement We break down the rxn of NaOH with HCl into putting solid NaOH pellets in water and determine the delta H value. Next, we mix aqueous NaOH with a HCl (aq) and determine the delta H. Then we mix solid NaOH pellets in HCl(aq) and measure the delta H. Can we say that the...

Homework Statement why does C2H5OH not affect the equilibrium of H+(aq) + 2CrO4-2(aq)---- yielding in a reversible reaction-----Cr2O7-2(aq) + OH-(aq) Homework Equations The Attempt at a Solution Is it because C2H5OH is such a weak acid that it does not dissociate and therefore...

Homework Statement If you started at the basic end-point and titrated acetate solution to the acid end point, how much acid would be required? Our acetate solution was: 1 mL of 0.1 M acetic acid 1 mL of 0.1 M acetate 8 mL of water total volume: 10 mL Titration with 0.1 M HCl...

i was recently reading about uv absorbance, and i understand why species such as the phenoxide ion and aniline absorb uv radiation at longer radiation and with more efficiency than their protonated counterparts. i have spent long hours, however, trying to figure out why a benzoate ion might...

Homework Statement after titrating sodium hydroxide with hydrofluoric acid, a chemist determined that the reaction had formed an aqueous solution of 0.020 mol/l sodium fluoride. determine ph of the solution Homework Equations The Attempt at a Solution Ka of HF= 6.3X10^-4 NaOH +...

Is Arcylic Acid a Reducing Acid Or an Oxidising Acid ? Or does it exhibit dual character ? Secondly, Butyl Arcylate only exhibits reducing properties - right ?

In my Chemical engineering Course, I have an Engineering Materials assignment, which needs to be submitted by this Monday. It contains questions based on the mechanical design of a binary distillation column that separates acrylic acid from butyl acrylate. I'm required to select a...

Homework Statement What functional groups are present based on the compound's names? A. Methyl Hydroxybenzoate B. 2-Hydroxypropanoic acidHomework Equations The Attempt at a Solution We've learned about the basic Hydrocarbon derivatives in class, but only dealing with problems like...

Can anyone tell me what a 1% (mass or volume) sulfuric acid solution is in moles? I want to find out the pH of a 1% (mass or volume) sulfuric acid solution?

Homework Statement A 0.149 g sample of a weak acid (HA) requires 16.80 mL of 0.110 M NaOH to completely reach the equivalence point. What is the Molar Mass of the acid? Homework Equations ... The Attempt at a Solution i don't think i did it right. i just did 0.0168Lx0.110M=...

Hi guys, I've got a question which i couldn't solve. Both napthalene (two benzene ring join together) and benzoic acid are aromatic compounds which exist as white solids. Based on their physical ahd chemical properties, describe how you could separate the components of a mixture of these...

How are the cells (say 2V) of a typical lead acid battery connected in series to increase voltage to 12V when all the neg. plates are connected together and all the positive plates are connected together which as I understand is the principle of connecting two batteries in parallel (pos...

Homework Statement Consider a titration in which 50.00 mL of .450 M benzoic acid, C6H5COOH, is reacted with 0.2000 M Ca(OH)2. What will the pH be when 60.00 mL of Ca(OH)2 has been added?Homework Equations 2C6H5COOH + Ca(OH)2 -> 2 H2O + Ca(C6H5COO)2The Attempt at a Solution I have determined...

I am uncertain if alcohol react with acid ( not carboxylic acid ) will produce salt or ester.

Can anyone help me with this homework question? it was like this: The reaction between the acid and aluminium is slow in the beginning and then gets faster. Give an explanation for this observation. Thanks.

Do they perform double replacement to form an insoluble precipitate? Will this reaction take place? How would I know?

Hi guys, i am wondering when amino acid (let's take glycine as an example) reacts with acyl chloride say ethyl chloride. Would it react with both the -COOH group and -NH2 group or would it be considered as an acid and reacts only with the -NH2 group?

Homework Statement "Soda lime is 85.0% NaOH and 15.0% CaO. What volume of 0.500M Hydrochloric Acid is required to completely neutralise 2.50g of the Soda Lime?" Hint: Consider the reactions separately Homework Equations Formation of Soda Lime: CO2 + H2O >> H2CO3 H2CO3 + 2NaOH >>...

How to prepare a 100mg/ml solution of glacial acetic acid in methanol? The density of glacial acetic acid is 1.05 g/cm^3.

"The rather strong acidity of trichloroacetic acid is usually ascribed to the inductive effect of the three chlorine atoms attached to the end of the molecle opposite the acidic proton. Electron density is withdrawn away from the carboxylate group so that the trichloroacetate anion that is...

I know how to get the answer for this question using hesselback equation but I don't understand the question. I have some questions about the questiuon. 1. The PKa value of the sulphydryl (-SH) group of cysteine is 8.33. Calculate the fraction of anion to free sulfhydryl group at PH 7.O...

Hi ! i am new to these forums.. so i just want to ask whether i am posting my query in the correct forum?? I have a doubt regarding this weak acid - weak base buffer. When the moles of Acid > Base, We use the formula pH = pka + log10 ([salt]/[acid]) to calculate the pH of the Acidic Buffer...

Hi, I am looking for more information on vapour pressures of propanal and propanoic acid at room tempreature and need to explain in in terms of molecular structure. Couldn't find any thing on it though.

Here's something I've been wondering about for some time. How long does it take a cell to produce a string of amino acids? More spesific: The duration between the DNa beginning to make the RNA string and the string of amino acids being delivered?

If I have x moles of magnesium and y moles of a monoprotic strong acid (I'm talking about something like 0.03 moles or less of each reactant with the magnesium being the limiting reactant) the there's going to be a noticable pH change right? Because I remember my teacher showing us the...

I've looked at a few websites and some say it is slightly soluble,some say it is insoluble in water and others say it is soluble only in hot water. I'm not sure which one is true. Hope someone can help. Thank you.

I've been trying to figure this one out for a while. A 0.1276g sample of a monoprotic acid was dissolved in 25mL H2O, and titrated with a .0633 M NaOH solution. Volume required to reach equivalence point was 18.4 mL. It asked me to calculate the molar mass, which i found to be 116g/mol: 0.0633...

how do I make 1000ml of 0.1M Nitric acid with 65% Nitric acide (specific gravity 1.42g) and Molecular weight 63g/mol

Homework Statement How can I calculate the enthalpy of solution for sulfuric acid at 30°C/68°F, for 0,2;0,5;1 mol/kg? Homework Equations The Attempt at a Solution I tried using a enthalpy-concentration diagram, but I cannot read it. I would apreciate if anyone could help me!

Will carbon powder dissolve (ionize) in sulfamic acid? If so, what ionic state?

1. Homework Statement How many peaks will there be in the NMR spectrum of Malic Acid, HOOC CH2 CH(OH) COOH, WITHOUT D2O as the solvent (i.e. Hydrogens in Hydroxyl groups WILL have corresponding peaks)? 3. The Attempt at a Solution I thought the two -COOH groups will be identical...

Homework Statement How many peaks will there be in the NMR spectrum of Malic Acid, HOOC CH2 CH(OH) COOH, WITHOUT D2O as the solvent (i.e. Hydrogens in Hydroxyl groups WILL have corresponding peaks)? The Attempt at a Solution I thought the two -COOH groups will be identical Hydrogen...

Hi there, I have some trouble understanding redox reactions. Here is the question: Sulphuric acid is one of the strongest inorganic acides which in some reaction shows oxidation properties. In which of reactions below, sulphuric acid acts as oxidating tool? A. \text{H}_2{SO}_4 +...

Homework Statement hey guys, I've got a prob, i kinda know how to do this question but i can't get past the first step. i want to write an equilbrium expression by I am not sure what the chemical reaction is. any help would be good Homework Equations A solution of a weak acid, HCOOH...

Homework Statement The active ingredient in aspirin is acetylsalicylic acid. A 2.51 g sample of acetysalicylic acid required 27.36 mL of a 0.5106 M NaOH for complete reaction. Addition of 13.68 mL of 0.5106 M HCl to the flask containing the aspirin and sodium hydroxide produced a mixture with...

Homework Statement Calculate the pH after 24 mL of 1.00 M NaOH is added from the burette to a beaker containing 25.0 mL of 1.00 M HCl Homework Equations pH = -log [H+] 1*10^-14 = [H+][OH-] The Attempt at a Solution combined volume = 49mL n.unreacted(H+) = 0.025-0.024 = 0.001...

I was told to design an experiment and run it during my chemistry lab period, and I came up with the following idea: Soil usually is limed with calcium carbonate containing products (agricultural lime) in order to raise the pH of the solution. Thus, I first isolated the amount of calcium from...

Homework Statement hey guys, i got a problem. "concentated nitric acid is 70.7% HNO3 (molar mass=63g) and 29.3% H20 by mass. the density of the solution is 1.42gcm. what is the molarity. Homework Equations i know i should rearrange the formula d=m/v but i can't work out the mass becuase...

Homework Statement Write two equations that illustrate that an aqeous solution of NaHCO3 can act either as an acid or a base. In pure water show quantitatively which of the two reactions predominate. ka1= 4.2x10-7, Ka2=4.8x10-11 The Attempt at a Solution as an acid: NaHCO3(aq) +...

I'm having some difficulty memorizing the strong acids for some reason. Does anybody have any tips or tricks to aid in memorization? Perhaps a mneumonic device? Or am I going to have to brute-force memorize?

Homework Statement What is the difference between alpha-keto acid and keto acid? The Attempt at a Solution I know that the difference is that alpha-keto acid contains an alpha carbon. However, I do not know what the alpha carbon is in this case, and how I can show it.