Acid Definition and 698 Threads

hi guys I want to know How to make HF(hydrofluoric acid)? I Know how to make H2SO4,HCl,HBr And HNO3. Any help?

What causes more damage to the eye? acid or base or both of them?? and why??

Hi all, I have a rather specific question regarding the content of a possible job for me in science (postdoc in academia). The job would imply do deal times to times with hydrofluoric acid (HF) in cleanroom, for wet etching of Si in particular. My background is more in physics - I have no...

I am attempting to do a lab that requires the determination of an unknown diprotic acid using a titration curve. I have graphed my data but I am unsure what point to use as my eq. point. In my lab manual it says I may use the second or first eq. point but the second is often clearer. I am not...

Homework Statement tetrahydrothiophene is stronger acid than tetrahydrofuran Homework Equations Acidic strength depends on stability of conjugate base.And stability of conjugate base in turn depends on following factors resonance,inductive effect,hybridization,atomic size i.e electron density...

Homework Statement when 10 cm3 of a monoprotic acid C3H6O3, with concentration of 7.2g/dm3, was titrated against against 0.05M NaCl, the equivalence point reached when 15.75cm3 (ph8) of NaOH was used. Calculate the acid dissociation constant Ka for C3H6O3. Homework EquationsThe Attempt at a...

Homework Statement What is the likely identity of a weak acid if a 0.50 mol/L solution of the acid has a pH of 3.18? Homework Equations HA + H2O <=> H3O + A K_{a} = \frac{[P]}{[R]} [H3O] = 10^{-pH} The Attempt at a Solution [/B] I set up an ICE table with the concentration given...

Homework Statement 25 cm3 of 1M NaOH added to an aspirin tablet. 25cm3 of distilled water also added. Mixture heated for 10 mins. Hydrolysed solution and washings transferred to a 250 cm3 conical flask and made up to the mark (250cm3). 25 cm3 of the hydrolysed solution is titrated against 0.1M...

We're attempting to measure the immunogenic affects of a particular molecule after subsequent acid and base treatments. As a first version, we're keeping it simple. After all treatment and neutralization, we wind up with 400 uL 0.2 N HCl + 400 uL 0.2 N NaOH + 200 uL H2O. We are getting massive...

Homework Statement As in the photo Homework EquationsThe Attempt at a Solution i need ans for this whole question . my ans for part i ) is oxalic acid - dicarboxlic acid tartaric acid - 2,3-dihydroxo-1,4-dicarboxlic acid . for part c ) I used dilute KMNO4 to differentiate these 2 compounds ...

Hi all I don't really understand this... How come that if an amino group is attached to the amino acid side chain, like in arginine or lysine, the molecule is basic, but if an hydroxyl group is attached, like threonine, it is not basic? How come the amino group can accept a H+ and a hydroxyl...

Homework Statement We're given an unknown acid, and dissolve an unknown mass of the acid in an unknown amount of water. We then titrated the solution with an unknown molarity solution of NaOH. After titrating in 10.0 mL of NaOH, we measure a pH of 5. After 34.68 mL of NaOH, we realize we...

Homework Statement [/B] Propenoic acid is a reactive organic liquid used in the manufacture of plastics, coatings, and adhesives. An unlabeled container is thought to contain this acid. A 0.2033-g sample is combusted in an apparatus such as that shown below. The gain in mass of the H2O absorber...

How can I use aluminum with hydrochloric acid to provide aluminum chloride?

I have a question about this reaction, I don't exactly know what I'm going to get (University coursework question). Reaction C4H10O + CaSO4 + HF --> ?

I need help finding the kinetics(rate laws) of this process. I've been searching for close to a week and can't seem to find them. It the carbonylation of ethylene to produce propionic acid(pretty much any variant of the process will do). I have access to my schools publication library so the...

i know that sodium react with hydrochloric acid to form sodium chloride and(according to what i readed) free hydrogen. but i also readed in wikipedia that sodium hydride is made by the direct reaction of liquid sodium with hydrogen. so sodium hydride can be formed in good proportion by passing...

Homework Statement The question asks me to use the modified Arrhenius theory of acids to classify the following as strong or weak acids, HNO3(aq), HI(aq) and HF(aq). Homework Equations But the book only says that the modified Arrhenius theory for acids is, "an Arrhenius acid reacts with...

Hi there, Wondering if anyone knows how to create pitting in steel with acid as the only method I know takes about 20 years and burying steel in the ground, not very ideal so was looking towards acid as I've heard of other people using it as an oxidizing agent to create corrosion on steel but...

Homework Statement What is the strongest acid among the following: H2O, H2S, H2Se, H2Te 2. The attempt at a solution I noticed they are in the same group so I think the idea is to pick the compound with the group 6 element that is largest in atomic size...I think it's H2Te because atomic size...

Homework Statement Problem: I am told that the first mechanism is operative in saponification. The Attempt at a Solution However, this strikes me as wrong because the first mechanism involves the formation of dianion. Using hydroxide ion to abstract a proton and make that particular...

I have a bottle of !00% liquid Citric Acid with the label showing Citric Acid and Water as contents. I need a 50% solution of the acid. Do I dilute this with water 50-50?

Homework Statement Barbituric acid is a single proton organic acid. Assume it is called "HA". Results show pH 4.22 in a solution of 0.020mol/dm3 of barbituric acid and 0.030mol/dm3 for sodium barbiturate, NaA. Calculate the "acid dissociation constant" for barbituric acid. Homework...

Why do Acetic Acid Battery power devices only for short periods of time? Does it have to do with Capacitance?

why can't we get 100% concentration of sulphuric acid by boiling it?

I was wondering because I did a TLC experiment where maleic acid has a RF of 1.4 and fumeric acid has an Rf of 4.5. Everywhere says that a longer Rf means that the solvent is less polar than a smaller Rf solvent. However I read somewhere else that Maleic acid has the same polarity as fumeric...

I have decided to grow a plant that could possibly help with my illness. This plant could possibly cause an issue due to its nature. Is there an acid that is somewhat safe to dissolve dried plant material quickly? I have looked at other physics forums that talk about piranha acid and that is WAY...

Homework Statement is it possible to use conc HNO3 instead of H2SO4 to allow the reaction of oxidation of cyclohexanol to haxane-1.6 dioic acid to occur? how can the reaction occur? cyclohexanol is seconary alcohol , it should be oxidised to ketone am i right? but it's oxidised to carboxylic...

1. Ascorbic acid in vitamin tablet Vitamin tablets with advertised contents including 750 mg ascorbic acid were analysed. A student took a whole tablet, crushed and dissolved all of it in water. He then diluted the tablet solution to a final volume of 250.0 mL. The student analysed 20.0 mL...

For a reaction like HCl + H2O → Cl- + H3O+, why is this reaction heavily favoured to the right in water? I've heard explanations that the products on the right are stabilized by the polar water molecules (considering aqueous solution). I'm just struggling to fully understand this because the...

HI ACID OR HCl ACID

According to Wikipedia, the proper chemical formula for Telluric Acid is Te(OH)_6. From what I've learned in chemistry thus far, acids made from polyatomic ions within the same group follow a similar pattern. For example, Selenic Acid H_2SeO_4 is analogous to Sulphuric acid H_2SO_4. If this...

Homework Statement I have no idea how to do any of these

Malonic acid can ionise in two stages as it is a dibasic acid. The values of pKa1 and pKa2 of malonic acid are 2.85 and 5.70 respectively. Calculate the pH of the first and second equivalence points of the titration of 10cm^3 of malonic acid of concentration 0.1 M with sodium hydroxide of...

Homework Statement In grapes, there is an equilibrium between tartaric acid and hydrogen tartrate and hydrogen ions: (1) H2T (aq) <=> HT- (aq) + H+ NOTE: "T" stands for the tartrate ion C4H4O6. There is also a buffer system in grapes, involving a solubility equilibrium of potassium hydrogen...

Homework Statement Find the pH of 0.02025 M tartaric acid using the method of multiple equilibria given that its Ka1 value is 9.2*10-4 and its Ka2 value is 4.31*10-5. Homework Equations Kaoverall = Ka1 * Ka2 The Attempt at a Solution Please check the Word document. Is my method...

Homework Statement I am attempting to draw 3-ethylbutanoic acid as well I am trying to determine the geometry of (FeCl4)- and (Ni(CN)4)-2. Also, can dichlorobisethylenediaminecobalt(III) chloride be expressed as (Coen2Cl2)Cl? Homework Equations The Attempt at a Solution I think...

Homework Statement How does sulfur trioxide react with water to form sulfuric acid Homework Equations This is clearly a Lewis acid/base problem. The Attempt at a Solution Okay, I tried drawing sulfur trioxide out with three double bonds (as it is traditionally drawn). I know...

Hello Forum! I have this review package for my final full of weird mistakes. Problem is that it is hard for me to know if the solutions are right or not: Could you please look at this problem I attached? They bizarrely switch from HA to HB. Is that just a typo? Then, the sign of DG°...

I collect branded goods and came across this old Energiser battery which had been left at one of those communal recycle collection points in our local supermarket, what a find, it's the old ones that I remember from my childhood and labelled as "Made in Britain" (my God, that must have been some...

I have some pieces of rusted mild steel pipes that i intend to remove rust from.I inserted a test sample in 15% Hydrochloric acid for 4 hours after which all the rust was removed from the surface and corrosion has slowed dramatically after washing off the acid.The subsequent pieces of steel pipe...

The concentrations of an acid depends on ________________. (a) Quantity (b) Ionization (c) Both It depends on what exactly we mean by concentrated? I have read a statement like hydrochloric acid having concentration 35-38% is considered concentrated while sulphuric acid having...

Should I need more info than just the formula to know if acid or base? Why? I am really confused. What does R stand for? SORRY, I MEANT NR3. PLEASE IGNORE CH3NH3ClO2.

Hi, everyone.. I do want to know, what are parameters that I have to know to dissolve TiO2,,?? I have tried many solvents like H2SO4, HCl, HNO3, citric acid, ascorbic acid, equi-molar citric/ascorbic acid,, but all was fail. could you tell me,,?? Thank you.. :)

The bonds between H and Cl are strong, almost close to ionic, right? Thus if that is the case why does HCl readily ionize into H+ and Cl- upon contact with water? It doesn't make sense that such a strongly bonded compound should completely disassociate upon contact with water. Further, why does...

Homework Statement The following chemical reaction takes place inside a reactor where 80% conversion is obtained with an equimolar mixture of NH3 and O2 fed at the flow rate of 100 mol/h. 4NH3 + 5O2 ⇔ 4NO + 6H2O What are the output rates of all species? There's a diagram shown where...

Given an aqueous solution (I'm omitting the subscripts): ## NH_3 + H_2O ←→ NH_4^+ + OH^- K_b ##Then we can also say: ## NH_3 + H^+ ←→ NH_4^+ K_b ## as well since they're equivalent reactions, right? They both have the same Kb value as a result, right? So then, ## K_b = \frac...

I seem to have a problem understanding this: If 1% of a weak acid dissociates in pure water. I would assume that 99% of it’s conjugate base would dissociate to form HA in pure water, but this is not the case: I tried to set up a situation below: Please help me understand what I’m...

example ...Co2 and No2

Homework Statement Draw the structure of aspartic acid at PH 4. I calculated the PI and based on that, drew the charged structure. If anyone can confirm that this is the correct structure. Homework Equations The Attempt at a Solution I attached the structure. Thanks for any assistance.