Acid Definition and 698 Threads

Hi, I need to put an electronic measurement system into a very nasty environment. An Ore pile where the minerals are being extracted using sulphuric acid and the temperature is 100-150 degrees C. I need an enclosure which will resist the acidic environment but conduct the heat to my...

titration-->pure sulphuric acid Homework Statement Why pure/conc. sulphuric acid is not suitable to prepare a standard solution directly? Homework Equations The Attempt at a Solution I know that it is hygroscopic,but what does it mean?Why absorbing moisture from the air will...

According to a program I heard yesterday, roughly 16% of Americans are deficient in Vitamin B12. There was also a related concern about deficiencies of folic acid, B6. The two are somehow related. Ref: The Health Show #1263 http://en.wikipedia.org/wiki/Folic_acid#B12_deficiency Vitamin...

Homework Statement i) Is lactic acid,CH3CH(OH)COOH a stronger or weaker acid than propanoic acid (CH3CH2COOH) ii) Another question is does ketone reacts with phosphorus pentachloride PCl5? Homework Equations The Attempt at a Solution (i) I guess lactic acid is a stronger acid...

Hi, I have simple question: In small OFF GRID wind turbine systems, it is worth to continuously charge & discharge 12V Lead Acid Batteries? this means that we want that our loads (lights, Fans e.t.c) are 24hours taking power from wind turbine & batteries will continuously charge &...

I just did this lab where I measured the absorbance of nucleic acid solutions and I have to find the concentration (in mg/mL) of each nucleic acid at different temperatures at 260nm. It is given that they have an absorption maximum at 260nm with an intensity of 17 OD (optical density) units/mg...

what theories out of the major two ( Bronsted-Lowry Theory of acids and bases and The Lewis Theory of acids and bases) should we use in common problems, and which one is more reliable ?

I am working on making Meads (Honey wine) and after speaking to a master Vinter he advised I lower the pH of my starting water & honey mixture to 3.5 for various reasons. I'm interested in experimenting to see if this gives a noticeable taste difference to the mead. I know honey is Basic but...

Dear All, I work towards realizing Aerospace parts. We etch Aluminum by phosphoric acid. Procedure requires us to do atomic absorption for finding the quantity of dissolved aluminum in acid solution. I do not have facility for Atomic absorption method though I have an acceptable facility for...

Homework Statement for a science experiment i am required to write relevant chemical equations to reactions that have occurred. I am having trouble showing the corrosion of iron, aluminum and copper in acetic acid and citric acid. Homework Equations heres what i have so far: Fe + 2...

Homework Statement I need to work out what is happening with the above reaction. Why is my data showing a very slow hydrogen gas production rate (if it even is hydrogen gas), in fact, even slower than the production of hydrogen gas from the reaction of magnesium and ethanoic acid. All acids...

I'm going to be giving a 1st year student chemistry tutoring so I'm going over some of his past exam papers to make sure I know all the stuff but I'm already at a question I can't do: http://img571.imageshack.us/img571/5716/26705030.png So from the formula, I can see that the degree of...

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.

Hi, I'm doing a spectroscopy assignment and am analysing the NMR for p-Toluic acid. However, I need to understand the NMRs of it's isomer o-Toluic acid as well. http://en.wikipedia.org/wiki/O-toluic_acid On first inspection, I thought there was 4 Hydrogen environments present in this...

Hi I have done some research into changing the pH of an acid and I have gotten mixed answers I have Nitric Acid of pH3 and I want to increase it to approximatly pH10. I have deionized water and want to add it to the Nitric Acid until its pH is approximatly 10. I have come across...

Hi all I have been reading over difference sites when they discuss pH and water and acids. I have under stood most of it. If I change the pH of an acid of say 3, to basic, i add water and this raises the pH of the subatance What I want to know is, does the molarity matter and type of...

Homework Statement I'm trying to find the pH change of adding 0.001 mol of HNO_{}3 to a buffer solution containing 0.24 M HF and 0.55 M NaF in 0.100 L. K_{}a = 3.5E-4 therefore pK_{}a=3.47 Homework Equations pH=pK_{}a+log_{}10[base]/[acid] (Henderson-Hasselbach equation) and of...

It is often claimed that one of the primary reasons paper degrades in books is due to acid hydrolysis of cellulose. If this is true, then why can't humans digest cellulose easily if cellulose can be easily broken down via acid hydrolysis alone (acid in the stomach)? Acid hydrolysis breakdown of...

Concentrated sulphuric acid is added to separate solid samples of sodium chloride, sodium bromide or sodium iodide. With which sample(s) does sulphuric acid act as an oxidising agent? A sodium chloride only B sodium chloride and sodium bromide C sodium bromide and sodium iodide D...

What type of bond is Sulfuric Acid (H2SO4(aq))? People tell me its ionic because the acid is made up of a polyatomic ion. However, many sources online say that the acid is polar. I can't seem to figure out which bond it is.

Suppose you have a HCl solution of 2.00 M Now suppose you keep on adding water, with no limit on how much water you are adding. We will reach a point where the HCl concentration is so low that if you take the negative log of the [H+] , you get a number greater than 7. Doesn't this mean...

Homework Statement In the reaction between a reactive metal and an acid the rate depends on the concentration of the acid. In a perfect experiment with all variable kept constant the rate of reaction and the concentration would be directly proportional to each other. However if in the...

Hi guys ! I'm in serious need of help! Could you guys teach me how to attempt the following questions? I've tried everything..from reading up the notes(which has been trimmed along the years to make people pass)..to asking my teacher(He only explains briefly and in a way which i can't...

Homework Statement Three milliliters of a 2.0 M solution of HCL are added to 1 liter of buffer solution containing 0.40 moles of the weak acid, propanoic acid (Ka = 1.4 x 10-5) and .50 moles of its conjugate base, sodium propanate. 1) find the ph of the buffer solution 2) find the ph when...

What is the pH of the solution formed when 0.040 mol KOH is added to 2.00 L of 0.020 m HCl? Hello all! I'm really struggling with this. I set up the change table with the reaction of KOH + HCl <> H2O + KCl, and so I end up with Ka = x/(.01-x)(0.2-x). What Ka value would I use? I may be...

Does Boric Acid Expire ? or become B2O3 after 5-10 years on its own? Hi, I have had some Boric acid (99.9%) bought a very long time ago... The expiry date was in 2006... I have used it recently and it is as if it's pure B2O3. Is that even possible??! How could it be?! or is there something I...

how can boric acid be a weak monobasic acid?i thought it was tribasic.

How do I make 7% glacial acetic acid in 40% (v/v) methanol?

So I understand that when you deporotonate a carboxylic acid, you get a RCOO-. This causes a delocalisation in the two oxygen atoms. I read somewhere that because of this delocalisation, it makes it less attractive to Hydrogen ions (protons). This makes the carboxylic acid more stable and...

hello friend, this is my first post please go easy on me. the best way i can express my problem is below. I attach a pic to give you a better idea. A is a circular disk with 4.5" diameter, DISK A is driven by C which is connected to a DC motor. B is a pin diameter of 1 mm which is going to...

In Acid Rain caused by car emissions, how does NO2 and OH from water chemically bond to form HNO3 (Nitric Acid)? From the subatomic and a skeletal formula perspectives, please. Does one covalent bond overpower another? How does the formula rearrange itself step by step?

i am doing my lab report and i just want to know how to calculate the absolute error of the acidic concentration and thank you.

When I first encountered the term genetic mutation, I envisioned a gene that had somehow spoiled – like an orange with mole on it. A little research indicated that a gene is a linear string of amino acids that codes for a protein. The term mutant gene was being used to indicate a gene in...

I see a lot of quacky sites about acid/alkaline body chemistry claiming that lemon juice and orange juice make the body alkaline. They both contain citric acid, orange juice also has lots of potassium... I cannot think of any mechanism whereby citric acid would somehow cause a persons body to...

Hi, I'm having a brain fart. Consider the amino acid glutamate (glutamic acid): -> When it forms an ionic bond with Na+ to make MSG, the glutamic acid loses it's hydrogen on the right side. Is it that it was "oxidized"? Or what do we call the process where it loses the hydrogen...

Long story short I have some undiagnosed medical condition that I've been to 5 doctors for. I have a bunch of symptoms and I've learned through experimentation that excessive amounts of salty foods and the phosphoric acid in coca cola dramatically improves my symptoms. I know they are both...

Homework Statement I was given the reaction in the attachment, and asked to find the product. 2. The attempt at a solution My understanding is that water can open epoxide rings, in an acidic environment. And so, I would figure that the product is 1-methyl-1,2-cyclohexanediol. I don't know...

Is a weak acids concentration determined from when it is in equilibrium, or if it hasn't dissociated at all? i.e. 0.100M CH3COOH. Would this be the concentration of CH3COOH during it's equilibrium: CH3COOH <-|-> CH3COO- + H+ Or just by itself? Thanks!

Homework Statement just a curosity of mine. citric acid is triprotic, with a pKa3 of 5.41, so does this mean that i will be inf ull conjugate base form(3-) at solution pH >5.41 Homework Equations The Attempt at a Solution

I would like to relate the pH of an aqueous phase diprotic acid solution to a value of the undissociated acid species concentration in the aqueous phase, and vice versa. I have Ka1 and Ka2 values for the acid. The overall dissociation equilibrium can be written: Ka1*Ka2 =...

In my lab at college we were analysing various pharmaceutical excipients, stearic acid being one of them. We did an iodine value test on it. From what I've read, the iodine-value test is to determine the degree of unsaturation of a compound. Stearic acid is a saturated fatty acid so I don't...

Homework Statement the question asks to determine if the equilibrium is greater, equal or less than 1. one of the equation is the following: [CuI4]2- (aq) + [CuCl4]3- (aq) ↔ [CuCl4]2-(aq) + [CuI4]3- (aq) Homework Equations The Attempt at a Solution the solution given was...

Which Acid is Best for Cleaning Rusty Iron ? Hi, What is the best acid/solution which can clean the rusty surface of Iron metal...? Is Nitric acid good enough? or hydrofluoric Acid? Thanks in advance...

Consider the following reaction: RCOO-COR + R'-OH → RCOO-R' + RCOOH (where -R is an alkyl group) In above reaction the acid anhydride and an alcohol forms ester and carboxylic acid. The acid anhydride used in this case is a symmetrical on that is containing only one alkyl group (R)...

Homework Statement Identify the following species as a Bronsted acid, base, or both a) HI b) CH3HOOH c) H2PO4- d) HSO4- I don't need the answers-- those are in the back of the book. I just don't understand how to classify each species. Thanks in advance for any help!

If its possible at all

I sell a machine that cleans oil coolers and heat exchangers with oil. I now want to put 10%-20% muriatic/water in it for another purpose. My exposures are brass, steel, iron, heating element and Aluminum... My concerns are out gassing from any of the elements... can I filter any of the...

Approximately 12 million kilograms of phosphoric acid (H3PO4) are produced annually for fertilizers, detergents, and agents for water treatment. Phosphoric acid can be prepared by heating the mineral fluoroapatite (Ca5(PO4)3F) with sulfuric acid in the presence of water. Ca5(PO4)3F + 5H2SO4 +...

Homework Statement In a lab, we are synthesizing salicylic acid fro methyl salicylate. The following steps are used: 1) Add NaOH to Methyl Salicylate 2) Heat solution 3) When solution has cooled, add HCl, then filter product My question is, what is present in the filtrate when filtering...

Hello everyone, Just one question: Does carbonic acid always immediately separate into water and carbon dioxide? I am writing down the reaction equation for HCl(aq) + NaHCO3(s) and HCl(aq) + Na2CO3(aq) that I tested in the lab. My TA told me carbon dioxide wouldn't form but I don't know...